[Federal Register Volume 88, Number 193 (Friday, October 6, 2023)]
[Proposed Rules]
[Pages 69826-69871]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2023-22149]



[[Page 69825]]

Vol. 88

Friday,

No. 193

October 6, 2023

Part III





 Department of Energy





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10 CFR Part 430





Energy Conservation Program: Energy Conservation Standards for Consumer 
Furnace Fans; Proposed Rule

  Federal Register / Vol. 88, No. 193 / Friday, October 6, 2023 / 
Proposed Rules  

[[Page 69826]]


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DEPARTMENT OF ENERGY

10 CFR Part 430

[EERE-2021-BT-STD-0029]
RIN 1904-AE64


Energy Conservation Program: Energy Conservation Standards for 
Consumer Furnace Fans

AGENCY: Office of Energy Efficiency and Renewable Energy, Department of 
Energy.

ACTION: Notification of proposed determination and request for comment.

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SUMMARY: The Energy Policy and Conservation Act, as amended (``EPCA''), 
prescribes energy conservation standards for various consumer products 
and certain commercial and industrial equipment, including consumer 
furnace fans. EPCA also requires the U.S. Department of Energy 
(``DOE'') to periodically determine whether more-stringent, amended 
standards would be technologically feasible and economically justified, 
and would result in significant energy savings. In this notification of 
proposed determination (``NOPD''), DOE has initially determined that it 
could not conclude that amended standards would be cost effective, and 
thus, is not proposing to amend its energy conservation standards for 
these products. DOE requests comment on this proposed determination and 
the associated analyses and results.

DATES: 
    Meeting: DOE will hold a webinar upon request. Please request a 
public webinar no later than October 20, 2023. See section VII, 
``Public Participation,'' for webinar registration information, 
participant instructions, and information about the capabilities 
available to webinar participants.
    Comments: Written comments and information are requested and will 
be accepted on or before December 5, 2023.

ADDRESSES: Interested persons are encouraged to submit comments using 
the Federal eRulemaking Portal at www.regulations.gov under docket 
number EERE-2021-BT-STD-0029. Follow the instructions for submitting 
comments.
    Alternatively, interested persons may submit comments, identified 
by docket number EERE-2021-BT-STD-0029, by any of the following 
methods:
    (1) Email: [email protected]. Include the 
docket number EERE-2021-BT-STD-0029 in the subject line of the message.
    (2) Postal Mail: Appliance and Equipment Standards Program, U.S. 
Department of Energy, Building Technologies Office, Mailstop EE-5B, 
1000 Independence Avenue SW, Washington, DC 20585-0121. Telephone: 
(202) 287-1445. If possible, please submit all items on a compact disc 
(``CD''), in which case it is not necessary to include printed copies.
    (3) Hand Delivery/Courier: Appliance and Equipment Standards 
Program, U.S. Department of Energy, Building Technologies Office, 950 
L'Enfant Plaza SW, 6th Floor, Washington, DC 20024. Telephone: (202) 
287-1445. If possible, please submit all items on a CD, in which case 
it is not necessary to include printed copies.
    No telefacsimiles (``faxes'') will be accepted. For detailed 
instructions on submitting comments and additional information on this 
process, see section VII of this document.
    Docket: The docket, which includes Federal Register notices, public 
meeting attendee lists and transcripts, comments, and other supporting 
documents/materials, is available for review at www.regulations.gov. 
All documents in the docket are listed in the www.regulations.gov 
index. However, not all documents listed in the index may be publicly 
available, such as information that is exempt from public disclosure.
    The docket web page can be found at www.regulations.gov/docket/EERE-2021-BT-STD-0029. The docket web page contains instructions on how 
to access all documents, including public comments, in the docket. See 
section VII, ``Public Participation,'' for further information on how 
to submit comments through www.regulations.gov.

FOR FURTHER INFORMATION CONTACT: 
    Ms. Julia Hegarty, U.S. Department of Energy, Office of Energy 
Efficiency and Renewable Energy, Building Technologies Office, EE-5B, 
1000 Independence Avenue SW, Washington, DC 20585-0121. Email: 
[email protected].
    Mr. Matthew Schneider, U.S. Department of Energy, Office of the 
General Counsel, GC-33, 1000 Independence Avenue SW, Washington, DC 
20585-0121. Telephone: (240) 597-6265. Email: 
[email protected].
    For further information on how to submit a comment or review other 
public comments and the docket contact the Appliance and Equipment 
Standards Program staff at (202) 287-1445 or by email: 
[email protected].

SUPPLEMENTARY INFORMATION:

Table of Contents

I. Synopsis of the Proposed Determination
II. Introduction
    A. Authority
    B. Background
    1. Current Standards
    2. History of Standards Rulemakings for Consumer Furnace Fans
    C. Deviation From Appendix A of the Process Rule
III. General Discussion
    A. General Comments
    1. Comments Opposing Amended Standards for Furnace Fans
    2. Comments Expressing Support for Amended Standards for Furnace 
Fans
    B. Product Classes and Scope of Coverage
    C. Test Procedure
    D. Technological Feasibility
    1. General
    2. Maximum Technologically Feasible Levels
    E. Cost Effectiveness
    F. Energy Savings
    1. Determination of Savings
    2. Significance of Savings
    G. Additional Considerations
IV. Methodology and Discussion of Related Comments
    A. Market and Technology Assessment
    1. Scope of Coverage
    2. Technology Options
    3. Impact From Other Rulemakings
    a. Screened-Out Technologies
    b. Remaining Technologies
    4. Product Classes
    B. Engineering Analysis
    1. Efficiency Analysis
    a. Baseline Efficiency Level
    b. Intermediate Efficiency Levels
    c. Maximum Technology Efficiency Levels
    d. Summary of Efficiency Levels Analyzed
    2. Cost Analysis
    a. Teardown Analysis
    b. Cost Estimation Method
    3. Cost-Efficiency Results
    C. Markups Analysis
    D. Energy Use Analysis
    E. Life-Cycle Cost and Payback Period Analysis
    1. Product Cost
    2. Installation Cost
    3. Annual Energy Consumption
    4. Energy Prices
    5. Maintenance and Repair Costs
    6. Product Lifetime
    7. Discount Rates
    8. Energy Efficiency Distribution in the No-New-Standards Case
    9. Payback Period Analysis
    F. Shipments Analysis
    G. National Impact Analysis
    1. Product Efficiency Trends
    2. National Energy Savings
    3. Net Present Value Analysis
    H. Further Considerations Related to Backward-Inclined Impellers
V. Analytical Results and Conclusions
    A. Economic Impacts on Individual Consumers
    B. National Impact Analysis
    1. Significance of Energy Savings
    2. Net Present Value of Consumer Costs and Benefits

[[Page 69827]]

    C. Proposed Determination
    1. BPM Motor With Backward-Inclined Impellers
    2. BPM Motor With Forward-Curved Impellers
    3. Summary
VI. Procedural Issues and Regulatory Review
    A. Review Under Executive Orders 12866, 13563, and 14094
    B. Review Under the Regulatory Flexibility Act
    C. Review Under the Paperwork Reduction Act
    D. Review Under the National Environmental Policy Act of 1969
    E. Review Under Executive Order 13132
    F. Review Under Executive Order 12988
    G. Review Under the Unfunded Mandates Reform Act of 1995
    H. Review Under the Treasury and General Government 
Appropriations Act, 1999
    I. Review Under Executive Order 12630
    J. Review Under the Treasury and General Government 
Appropriations Act, 2001
    K. Review Under Executive Order 13211
    L. Review Under the Information Quality Bulletin for Peer Review
VII. Public Participation
    A. Participation in the Webinar
    B. Submission of Comments
    C. Issues on Which DOE Seeks Comment
VIII. Approval of the Office of the Secretary

I. Synopsis of the Proposed Determination

    The Energy Policy and Conservation Act, Public Law 94-163, as 
amended (``EPCA''),\1\ authorizes DOE to regulate the energy efficiency 
of a number of consumer products and certain industrial equipment. (42 
U.S.C. 6291-6317) Title III, Part B of EPCA \2\ established the Energy 
Conservation Program for Consumer Products Other Than Automobiles. (42 
U.S.C. 6291-6309) These products include consumer furnace fans, the 
subject of this NOPD. (42 U.S.C. 6295(f)(4)(D))
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    \1\ All references to EPCA in this document refer to the statute 
as amended through the Energy Act of 2020, Public Law 116-260 (Dec. 
27, 2020), which reflect the last statutory amendments that impact 
Parts A and A-1 of EPCA.
    \2\ For editorial reasons, upon codification in the U.S. Code, 
Part B was redesignated Part A.
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    DOE is issuing this NOPD pursuant to the EPCA requirement that not 
later than 6 years after issuance of any final rule establishing or 
amending a standard, DOE must publish either a notification of 
determination that standards for the product do not need to be amended, 
or a notice of proposed rulemaking (``NOPR'') including new proposed 
energy conservation standards (proceeding to a final rule, as 
appropriate). (42 U.S.C. 6295(m))
    For this proposed determination, DOE analyzed consumer furnace fans 
subject to standards specified in 10 CFR 430.32(y). DOE first analyzed 
the technological feasibility of more energy efficient consumer furnace 
fans. For those consumer furnace fans for which DOE determined higher 
standards to be technologically feasible, DOE evaluated whether higher 
standards would be cost effective by conducting life-cycle cost 
(``LCC'') and payback period (``PBP'') analyses. In addition, DOE 
estimated energy savings that would result from potential energy 
conservation standards by conducting a national impacts analysis 
(``NIA''), in which it estimated the net present value (``NPV'') of the 
total costs and benefits experienced by consumers.
    Based on the results of the analyses, summarized in section V of 
this document, DOE has tentatively determined that current standards 
for consumer furnace fans do not need to be amended.

II. Introduction

    The following section briefly discusses the statutory authority 
underlying this proposed determination, as well as some of the 
historical background relevant to the establishment of standards for 
consumer furnace fans.

A. Authority

    EPCA authorizes DOE to regulate the energy efficiency of a number 
of consumer products and certain industrial equipment. Title III, Part 
B of EPCA established the Energy Conservation Program for Consumer 
Products Other Than Automobiles. These products include consumer 
furnace fans, the subject of this document. (42 U.S.C. 6295(f)(4)(D)) 
Specifically, EPCA authorized DOE to establish energy conservation 
standards for electricity used for purpose of circulating air through 
duct work. (Id.)
    The energy conservation program under EPCA consists essentially of 
four parts: (1) testing, (2) labeling, (3) the establishment of Federal 
energy conservation standards, and (4) certification and enforcement 
procedures. Relevant provisions of EPCA specifically include 
definitions (42 U.S.C. 6291), test procedures (42 U.S.C. 6293), 
labeling provisions (42 U.S.C. 6294), energy conservation standards (42 
U.S.C. 6295), and the authority to require information and reports from 
manufacturers (42 U.S.C. 6296).
    Subject to certain criteria and conditions, DOE is required to 
develop test procedures to measure the energy efficiency, energy use, 
or estimated annual operating cost of each covered product. (42 U.S.C. 
6295(o)(3)(A) and 42 U.S.C. 6295(r)) Manufacturers of covered products 
must use the prescribed DOE test procedure as the basis for certifying 
to DOE that their products comply with the applicable energy 
conservation standards adopted under EPCA and when making 
representations to the public regarding the energy use or efficiency of 
those products. (42 U.S.C. 6293(c) and 42 U.S.C. 6295(s)) Similarly, 
DOE must use these test procedures to determine whether the products 
comply with standards adopted pursuant to EPCA. (42 U.S.C. 6295(s)) The 
DOE test procedures for consumer furnace fans appear at title 10 of the 
Code of Federal Regulations (``CFR'') part 430, subpart B, appendix AA.
    Federal energy conservation requirements generally supersede State 
laws or regulations concerning energy conservation testing, labeling, 
and standards. (42 U.S.C. 6297(a)-(c)) DOE may, however, grant waivers 
of Federal preemption for particular State laws or regulations, in 
accordance with the procedures and other provisions set forth under 
EPCA. (See 42 U.S.C. 6297(d))
    Pursuant to the amendments contained in the Energy Independence and 
Security Act of 2007 (EISA 2007), Public Law 110-140, any final rule 
for new or amended energy conservation standards promulgated after July 
1, 2010, is required to address standby mode and off mode energy use. 
(42 U.S.C. 6295(gg)(3)) Specifically, when DOE adopts a standard for a 
covered product after that date, it must, if justified by the criteria 
for adoption of standards under EPCA (42 U.S.C. 6295(o)), incorporate 
standby mode and off mode energy use into a single standard, or, if 
that is not feasible, adopt a separate standard for such energy use for 
that product. (42 U.S.C. 6295(gg)(3)(A)-(B)) However, DOE has 
previously determined that there is no need to address standby and off 
mode energy use in the standards for consumer furnace fans, as the 
standby mode and off mode energy use associated with furnace fans is 
accounted for by the standards and test procedures for the products in 
which furnace fans are used (i.e., consumer furnaces and consumer 
central air conditioners and heat pumps). 79 FR 499, 504. DOE 
maintained the same approach in the proposed amended test procedure for 
consumer furnace fans (the ``May 2022 TP NOPR''). 87 FR 29576.
    DOE must periodically review its already established energy 
conservation standards for consumer furnace fans no later than 6 years 
from the issuance of a final rule establishing or amending a standard 
for consumer furnace fans. (42

[[Page 69828]]

U.S.C. 6295(m)) This 6-year look-back provision requires that DOE 
publish either a determination that standards do not need to be amended 
or a NOPR, including new proposed standards (proceeding to a final 
rule, as appropriate). (42 U.S.C. 6295(m)(1)) EPCA further provides 
that, not later than 3 years after the issuance of a final 
determination not to amend standards, DOE must publish either a 
notification of determination that standards for the product do not 
need to be amended, or a NOPR including new proposed energy 
conservation standards (proceeding to a final rule, as appropriate). 
(42 U.S.C. 6295(m)(3)(B)) DOE must make the analysis on which a 
determination is based publicly available and provide an opportunity 
for written comment. (42 U.S.C. 6295(m)(2))
    A determination that amended standards are not needed must be based 
on consideration of whether amended standards will result in 
significant conservation of energy, are technologically feasible, and 
are cost effective. (42 U.S.C. 6295(m)(1)(A) and 42 U.S.C. 6295(n)(2)) 
Under 42 U.S.C. 6295(o)(2)(B)(i)(II), an evaluation of cost-
effectiveness requires DOE to consider savings in operating costs 
throughout the estimated average life of the covered products in the 
type (or class) compared to any increase in the price, initial charges, 
or maintenance expenses for the covered products that are likely to 
result from the standard. (42 U.S.C. 6295(n)(2) and 42 U.S.C. 
6295(o)(2)(B)(i)(II)) DOE is publishing this NOPD in satisfaction of 
the 6-year review requirement in EPCA. (42 U.S.C. 6295(m))

B. Background

1. Current Standards
    In a final rule published on July 3, 2014 (``July 2014 Final 
Rule''), DOE prescribed the current energy conservation standards for 
consumer furnace fans manufactured on and after July 3, 2019. 79 FR 
38130. These standards are set forth in DOE's regulations at 10 CFR 
430.32(y) and are repeated in Table II.1.

 Table II.1--Federal Energy Conservation Standards for Consumer Furnace
                                  Fans
------------------------------------------------------------------------
                                             Fan energy rating (``FER'')
         Furnace fan product class            (watts/1000 cubic feet per
                                                  minute (``cfm''))
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Non-Weatherized, Non-Condensing Gas (``NWG-  FER = 0.044 * Qmax + 182.
 NC'').
Non-Weatherized, Condensing Gas (``NWG-C'')  FER = 0.044 * Qmax + 195.
Weatherized, Non-Condensing Gas (``WG-NC'')  FER = 0.044 * Qmax + 199.
Non-Weatherized, Non-Condensing Oil Furnace  FER = 0.071 * Qmax + 382.
 Fan (``NWO-NC'').
Non-Weatherized Electric Furnace/Modular     FER = 0.044 * Qmax + 165.
 Blower Fan (``NWEF/NWMB'').
Mobile Home Non-Weatherized, Non-Condensing  FER = 0.071 * Qmax + 222.
 Gas Furnace Fan (``MH-NWG-NC'').
Mobile Home Non-Weatherized, Condensing Gas  FER = 0.071 * Qmax + 240.
 Furnace Fan (``MH-NWG-C'').
Mobile Home Electric Furnace/Modular Blower  FER = 0.044 * Qmax + 101.
 Fan (``MH-EF/MB'').
Mobile Home Non-Weatherized Oil Furnace Fan  Reserved.
 (``MH-NWO'').
Mobile Home Weatherized Gas Furnace Fan      Reserved.
 (``MH-WG'').
------------------------------------------------------------------------

2. History of Standards Rulemakings for Consumer Furnace Fans
    DOE established energy conservation standards at 10 CFR 430.32(y) 
for furnace fans through a final rule published in the Federal Register 
on July 3, 2014 (``July 2014 Final Rule''). 79 FR 38130. As discussed 
in section II.A of this document, EPCA authorized DOE to establish 
energy conservation standards for electricity used for purpose of 
circulating air through duct work. (42 U.S.C. 6295(f)(4)(D)) While the 
statutory language allows for regulation of the electricity use of any 
electrically-powered device applied to residential central heating, 
ventilation, and air conditioning (``HVAC'') systems for the purpose of 
circulating air through duct work, in the July 2014 Final Rule DOE 
established standards only for certain furnace fans used in furnaces 
and modular blowers. 79 FR 38130, 38146. Compliance with the prescribed 
standards established for consumer furnace fans in the July 2014 Final 
Rule was required as of July 3, 2019. DOE's energy conservation 
standards for furnace fans use the fan energy rating (``FER'') metric, 
which is the ratio of the electrical energy consumption to airflow, 
expressed as watts per 1,000 cubic feet per minute of airflow (``W/1000 
cfm''). 10 CFR 430.32(y). In evaluating whether amended standards for 
furnace fans are warranted, DOE used the test procedure for determining 
FER is established at 10 CFR part 430 subpart B appendix AA, Uniform 
Test Method for Measuring the Energy Consumption of Furnace Fans 
(``appendix AA''). In parallel to this rulemaking, DOE is considering 
whether amendments are warranted for the current test procedure for 
furnace fans. On May 13, 2022, DOE published a notice of proposed 
rulemaking (``NOPR'') concerning the test procedure for furnace fans 
(``May 2022 TP NOPR''). 87 FR 29576.
    In support of the present review of the consumer furnace fans 
energy conservation standards, DOE published a request for information 
(``RFI''), which identified various issues on which DOE sought comment 
to inform its determination of whether the standards need to be amended 
on November 23, 2021 (the ``November 2021 RFI''). 86 FR 66465. The 
following year, on November 1, 2022, DOE published a notice of 
availability of the preliminary technical support document (the 
``November 2022 Preliminary Analysis'') in the Federal Register. 87 FR 
65687. In the November 2022 Preliminary Analysis, DOE assessed 
potential amended standard levels for consumer furnace fans.
    On September 20, 2022, a consent decree was issued for NRDC et al. 
v. DOE and New York et al. v. DOE that mandated that a final agency 
action pertaining to energy conservation standards (i.e., a final rule 
amending energy conservation standards or a final determination not to 
amend standards) must be issued by October 31, 2024.
    DOE received comments in response to the November 2022 Preliminary 
Analysis from the interested parties listed in Table II.2.

[[Page 69829]]



                             Table II.2--November 2022 Preliminary Analysis Comments
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                                      Reference in this   Comment No. in
           Commenter(s)                     NOPD            the docket                Commenter type
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Air Conditioning, Heating and       AHRI................              23  Trade Association.
 Refrigeration Institute.
Appliance Standards Awareness       Joint Commenters....              20  Efficiency Organization.
 Project, American Council for an
 Energy-Efficient Economy,
 National Consumer Law Center,
 Natural Resources Defense Council.
Carrier Global Corporation........  Carrier.............              19  Manufacturer.
Charles Beach.....................  Beach...............              16  Individual.
Daikin Comfort Technologies.......  Daikin..............            * 26  Manufacturer.
Lennox International Inc..........  Lennox..............              24  Manufacturer.
Morrison Products Inc.............  Morrison............              27  Manufacturer.
Nidec Motors......................  Nidec...............            * 26  Manufacturer.
Northwest Energy Efficiency         NEEA................              25  Efficiency Organization.
 Alliance.
Pacific Gas and Electric Company,   CA IOUs.............              21  Utility.
 San Diego Gas and Electric,
 Southern California Edison.
Rheem Manufacturing Company.......  Rheem...............            * 26  Manufacturer.
Trane Technologies................  Trane...............              22  Manufacturer.
Weil-McLain Technologies..........  Weil-McLain.........            * 26  Manufacturer.
----------------------------------------------------------------------------------------------------------------
* Comment No. 26 corresponds to the transcript for the webinar held December 5, 2022. These commenters made oral
  comments during the public meeting that are summarized and discussed in this document.

    Any oral comments provided during the webinar that are not 
substantively addressed by written comments are summarized and cited 
separately throughout this NOPD. A parenthetical reference at the end 
of a comment quotation or paraphrase provides the location of the item 
in the public record.\3\
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    \3\ The parenthetical reference provides a reference for 
information located in the docket. (Docket No., which is maintained 
at www.regulations.gov). The references are arranged as follows: 
(commenter name, comment docket ID number, page of that document).
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C. Deviation From Appendix A of the Process Rule

    In accordance with section 3(a) of 10 CFR part 430, subpart C, 
appendix A (``appendix A''), DOE notes that it is deviating from the 
provision in the appendix A regarding the pre-NOPR and NOPR stages for 
an energy conservation standards rulemaking.
    Section 6(f)(2) of the appendix A specifies that the length of the 
public comment period for a NOPR will be not less than 75 calendar 
days. For this NOPD, DOE has opted instead to provide a 60-day comment 
period, as required by EPCA. 42 U.S.C. 6295(p). DOE is opting to 
deviate from the 75-day comment period because stakeholders have 
already been afforded an opportunity to provide comments on this 
rulemaking. As noted previously, DOE requested comment on various 
issues pertaining to this standards rulemaking in the November 2021 
RFI, a November 2022 preliminary analysis, and collectively provided 
stakeholders with more than a 90 days to comment. 86 FR 66465 and 87 FR 
65687. Therefore, DOE believes a 60-day comment period is appropriate 
and will provide interested parties with a meaningful opportunity to 
comment on the proposed determination.

III. General Discussion

    DOE developed this proposed determination after considering 
comments, data, and information from interested parties that represent 
a variety of interests. This notice addresses issues raised by these 
commenters.

A. General Comments

1. Comments Opposing Amended Standards for Furnace Fans
    In response to the November 2022 Preliminary Analysis, several 
commenters expressed opposition to amending standards for consumer 
furnace fans.
    Trane commented that it does not support adopting efficiency level 
(``EL'') 1 for consumer furnace fan standards because the assumptions 
used in the TSD are flawed and when corrected will result in much 
smaller energy savings, higher consumer costs, and undue burden to 
manufacturers who will need to redesign all furnaces to adopt backward-
inclined impellers. (Trane, No. 22 at p. 1) Trane commented that EL 1 
analyzed in the November 2022 Preliminary Analysis fails to meet: (1) 
the energy savings threshold because the energy savings outlined in the 
TSD are overstated; (2) the technological feasibility requirement 
because there is a need for additional technology development before EL 
1 is feasible; and (3) the economic justification criteria. 
Specifically, Trane stated that EL 1 is not economically justified for 
the following reasons: (1) the negative economic impact will be 
significant in terms of manufacturer redesign costs (for relatively 
small energy savings); (2) consumers will face higher product and 
installation costs; (3) consumers will encounter negative lifetime 
operating cost savings and energy savings will be lower than DOE 
predicted; (4) there will be negative impacts on safety and efficiency 
due to changes in airflow patterns (impacting utility or performance); 
and (5) the potential for lessening of competition will be increased 
because units with backward-inclined impellers do not currently exist. 
Trane therefore commented that the use of EL 1 should not be considered 
for furnace fans. (Id. at p. 4) Morrison commented that DOE's values 
for the product cost increase were undercounted, the energy savings 
were overestimated, and the resulting benefit to consumers would be 
half of the values that DOE projects. Therefore, Morrison concluded 
that DOE underestimated the LCC and PBP in the November 2022 
Preliminary Analysis, and that the actual numbers will reflect a net 
cost for more consumers than currently projected. (Morrison, No. 27 at 
p. 4) Lennox recommended DOE conclude that no new furnace fan standards 
are warranted for the NWG-NC, NWG-C, and WG-NC product classes due to 
very high levels of consumers experiencing net costs from potential 
amended standards. Lennox noted that for NWG-NC and NWG-C, 44 percent 
and 48 percent, respectively, of consumers experience a net cost, while 
for WG-NC, 26 percent of consumers experience a net cost. Lennox also 
commented that for the NWO-NC product class, although the payback 
period and percent of consumers experiencing a net cost are favorable 
for

[[Page 69830]]

EL 1, the energy savings associated with these products is minimal 
(0.00003 quads) and does not meet the criteria of significant energy 
savings, and therefore amended standards are not likely warranted. 
(Lennox, No. 24 at p. 2) Lennox also commented that the feasible 
technologies available for furnace fans have not changed since the last 
furnace fan standards rulemaking in 2019, but equipment costs have 
increased over the same time period due to inflation and supply chain 
issues. Lennox stated that many consumers have been adversely impacted 
by the COVID-19 pandemic, and increasing furnace fan equipment costs 
with new efficiency standards is both ill-advised and economically 
unjustified at this time. (Id. at p. 2)
    AHRI stated that while the simple payback period of many maximum 
technology feasible (``max-tech'') furnace fans appears to be 
favorable, almost every class of fan provides minimal average cost 
savings to consumers and projections showing that, in all but one case, 
over 44 percent of consumers will experience a net cost. AHRI commented 
that this cost, combined with AHRI's concerns about the 
misrepresentation of the cost of products with a backward-inclined 
impeller, lead AHRI to expect that the true percentage of affected 
consumers will be higher than stated. (AHRI, No. 23 at p. 3)
    Morrison recommended that DOE consider the timing and length of 
analysis periods for complex rulemaking documents, as the public 
comment period for this rulemaking was at a time of year in which 
under-staffing is common, and, as a result, Morrison stated that it is 
unable to guarantee the thoroughness and attention to detail of its 
response to this rulemaking. (Morrison, No. 27 at p. 6)
    As discussed in section II.A of this document, DOE must 
periodically review its already established energy conservation 
standards for consumer furnace fans no later than 6 years from the 
issuance of a final rule establishing or amending a standard for 
consumer furnace fans. This 6-year look-back provision requires that 
DOE publish either a determination that standards do not need to be 
amended or a NOPR, including new proposed standards (proceeding to a 
final rule, as appropriate). (42 U.S.C. 6295(m)(1)) Additionally, EPCA 
provides specific statutory criteria for amending energy conservation 
standards. EPCA generally requires a public notice-and-comment process 
(see 42 U.S.C. 6295(p)), which affords members of the public the 
opportunity to comment on the rulemaking and all documents are made 
publicly available at www.regulations.gov. As part of the process for 
this rulemaking, DOE carefully considers the benefits and burdens of 
amended standards to determine whether the amended standards are the 
maximum standard levels that are technologically feasible and 
economically justified, and would conserve a significant amount of 
energy, as required by EPCA (see 42 U.S.C. 6295(o)(2)-(3)). Section IV 
of this document outlines DOE's approach to analyzing various potential 
amended standard levels, which was conducted in accordance with the 
statutory requirements outlined in EPCA (and described above) for 
determining whether to establish or amend standards. Section V of this 
document provides the results of those analyses, as well as a detailed 
explanation of DOE's weighing of the benefits and burdens and the 
rationale for proposing not to amend standards for consumer furnace 
fans at this time based on the criteria specified in EPCA. Morrison 
stated that having separate measures of energy efficiency for furnaces 
and furnace fans may risk confusing consumers as to which efficiency 
label they should choose when purchasing equipment, in turn increasing 
the potential for wasted energy. (Morrison, No. 27 at p. 2) Lennox 
similarly commented that when consumers consider energy efficiency 
while purchasing residential furnaces, they evaluate the annual fuel 
utilization efficiency (``AFUE'') metric for consumer furnaces. Lennox 
commented that furnace fans typically account for less than 2 percent 
of the overall energy use of a residential furnace system in heating 
operation, and DOE furnace fan standards are not a focus of the 
consumer purchase decision. (Lennox, No. 24 at p. 8)
    In response, DOE notes that EPCA directed DOE to consider and 
prescribe energy conservation standards or energy use standards for 
electricity used for the purposes of circulating air through ductwork. 
(42 U.S.C. 6295(f)(4)(D)) The AFUE metric used for furnaces does not 
account for the electricity used by the furnace fan to move air through 
ductwork. Therefore, to satisfy the requirements of EPCA, DOE 
established the FER test method and metric to account for the 
electrical energy consumption for circulating air through ductwork and 
will maintain AFUE and FER as separate metrics for consumer furnaces 
and consumer furnace fans, respectively.
2. Comments Expressing Support for Amended Standards for Furnace Fans
    In response to the November 2022 Preliminary Analysis, several 
commenters encouraged DOE to amend standards for consumer furnace fans.
    The CA IOUs commented that DOE's analyses show significant 
lifetime-operating-cost savings and short-payback periods for the NWO-
NC, MH-NWG-NC, MH-NWG-C, and MH-NWO-NC product classes. (CA IOUs, No. 
21 at p. 1) The CA IOUs stated that they support DOE's finding that 
brushless permanent magnet (``BPM'') motors are cost-effective for all 
product classes. (Id. at p. 1)
    NEEA recommended that DOE adopt a BPM standard level for all 
equipment classes, including those DOE proposed in the expansion and 
for any additional classes that DOE could cover. NEEA commented that by 
raising the standard to BPM motors beyond non-weatherized gas furnaces, 
DOE would ensure that there are fewer applications where inefficient 
furnace fans are being used in the market. NEEA further commented that 
the market for BPM motors is mature, and the adoption of additional 
product classes should not negatively impact manufacturers. (NEEA, No. 
24 at p. 3)
    As part of the rulemaking process, DOE carefully considers the 
benefits and burdens of potential amended standards to determine 
whether the potential amended standards are the maximum standard levels 
that are technologically feasible and economically justified, and would 
conserve a significant amount of energy, as required by EPCA (see 42 
U.S.C. 6295(o)(2)-(3)). Section IV of this document outlines DOE's 
approach to analyzing various potential amended standard levels, and 
section V of this document provides the results of those analyses, as 
well as a detailed explanation of DOE's weighing of the benefits and 
burdens and the rationale for proposing not to amend standards for 
consumer furnace fans.

B. Product Classes and Scope of Coverage

    When evaluating and establishing energy conservation standards, DOE 
divides covered products into product classes by the type of energy 
used or by capacity or other performance-related features that justify 
differing standards. In making a determination whether a performance-
related feature justifies a different standard, DOE must consider such 
factors as the utility of the feature to the consumer and other factors 
DOE determines are appropriate. (42 U.S.C.

[[Page 69831]]

6295(q)) The scope of coverage and product classes for this proposed 
determination are discussed in further detail in section IV.A.1 and 
IV.A.4, respectively. This proposed determination covers consumer 
furnace fans defined as an electrically-powered device used in a 
consumer product for the purpose of circulating air through ductwork. 
10 CFR 430.2.

C. Test Procedure

    EPCA sets forth generally applicable criteria and procedures for 
DOE's adoption and amendment of test procedures. (42 U.S.C. 6293) 
Manufacturers of covered products must use these test procedures to 
certify to DOE that their product complies with energy conservation 
standards and to quantify the efficiency of their product. (42 U.S.C. 
6295(s) and 42 U.S.C. 6293(c)) The test procedure for determining FER 
is established at 10 CFR part 430 subpart B appendix AA, Uniform Test 
Method for Measuring the Energy Consumption of Furnace Fans (``appendix 
AA''). On May 13, 2022, DOE published the May 2022 TP NOPR, which 
proposed to amend the test procedure for consumer furnace fans. 87 FR 
29576. Specifically, the May 2022 TP NOPR proposed the following 
changes: (1) Specify testing instructions for furnace fans incapable of 
operating at the required external static pressure (``ESP''). (2) 
Incorporate by reference the most recent versions of industry 
standards, ASHRAE 103-2017 and ASHRAE 37-2009 (RA 2019), in 10 CFR 
430.3. (3) Define dual-fuel furnace fans and exclude them from the 
scope of appendix AA. (4) Change the term ``default airflow control 
settings'' to ``specified airflow control settings.'' (5) Add 
provisions to directly measure airflow. (6) Revise the ambient 
temperature conditions allowed during testing to between 65 degrees 
Fahrenheit (``[deg]F'') and 85 [deg]F for all units (both condensing 
and non-condensing). (7) Assign an allowable range of relative humidity 
during testing to be between 20 percent and 80 percent. Id. at 25979. 
DOE is still considering comments received in response to the May 2022 
TP NOPR and has not yet finalized any updates to the test procedure.

D. Technological Feasibility

1. General
    In evaluating potential amendments to energy conservation 
standards, DOE conducts a screening analysis based on information 
gathered on all current technology options and prototype designs that 
could improve the efficiency of the products or equipment that are the 
subject of the determination. As the first step in such an analysis, 
DOE develops a list of technology options for consideration in 
consultation with manufacturers, design engineers, and other interested 
parties. DOE then determines which of those means for improving 
efficiency are technologically feasible. DOE considers technologies 
incorporated in commercially available products or in working 
prototypes to be technologically feasible. Sections 6(b)(3)(i) and 
7(b)(1) of appendix A to 10 CFR part 430 subpart C (``Process Rule'').
    After DOE has determined that particular technology options are 
technologically feasible, it further evaluates each technology option 
in light of the following additional screening criteria: (1) 
practicability to manufacture, install, and service; (2) adverse 
impacts on product utility or availability; (3) adverse impacts on 
health or safety; and (4) unique-pathway proprietary technologies. 
Sections 6(b)(3)(ii)-(v) and 7(b)(2)-(5) of the Process Rule. Section 
IV.A.4 of this document discusses the results of the screening analysis 
for consumer furnace fans, particularly the designs DOE considered, 
those it screened out, and those that are the basis for the standards 
considered in this proposed determination.
2. Maximum Technologically Feasible Levels
    As when DOE proposes to adopt a new or amended standard for a type 
or class of covered product, in this analysis it must determine the 
maximum improvement in energy efficiency or maximum reduction in energy 
use that is technologically feasible for such a product. (42 U.S.C. 
6295(p)(1)) Accordingly, in the engineering analysis, DOE determined 
the maximum technologically feasible improvements in energy efficiency 
for consumer furnace fans, using the design parameters for the most 
efficient products available on the market or in working prototypes. 
The max-tech levels that DOE determined for this analysis are described 
in section IV.B of this proposed determination.

E. Cost Effectiveness

    In making a determination of whether amended energy conservation 
standards are needed, EPCA requires DOE to consider the cost 
effectiveness of amended standards in the context of the savings in 
operating costs throughout the estimated average life of the covered 
product compared to any increase in the price of, or in the initial 
charges for, or maintenance expenses of, the covered product that are 
likely to result from a standard. (42 U.S.C. 6295(o)(2)(B)(i)(II))
    In determining cost effectiveness of amending standards for 
consumer furnace fans, DOE conducted LCC and PBP analyses that estimate 
the costs and benefits to users from potential standards. To further 
inform DOE's consideration of the cost effectiveness of potential 
amended standards, DOE considered the NPV of total costs and benefits 
estimated as part of the NIA. The inputs for determining the NPV of the 
total costs and benefits experienced by consumers are (1) total annual 
installed cost, (2) total annual operating costs (energy costs and 
repair and maintenance costs), and (3) a discount factor to calculate 
the present value of costs and savings.

F. Energy Savings

1. Determination of Savings
    For each efficiency level (``EL'') evaluated, DOE projected energy 
savings from application of the EL to the consumer furnace fans 
purchased in the 30-year period that begins in the assumed year of 
compliance with the potential standards (2030-2059). The savings are 
measured over the entire lifetime of the consumer furnace fans 
purchased in the previous 30-year period. DOE quantified the energy 
savings attributable to each EL as the difference in energy consumption 
between each standards case and the no-new-standards case. The no-new-
standards case represents a projection of energy consumption that 
reflects how the market for a product would likely evolve in the 
absence of amended energy conservation standards. DOE used its NIA 
spreadsheet model to estimate national energy savings (NES) from 
potential amended or new standards for consumer furnace fans. The NIA 
spreadsheet model (described in section IV.G of this document) 
calculates energy savings in terms of site energy, which is the energy 
directly consumed by products at the locations where they are used. For 
electricity, DOE reports NES in terms of primary energy savings, which 
is the savings in the energy that is used to generate and transmit the 
site electricity. DOE also calculates NES in terms of full-fuel-cycle 
(FFC) energy savings. The FFC metric includes the energy consumed in 
extracting, processing, and transporting primary fuels (i.e., coal, 
natural gas, petroleum fuels), and thus presents a more complete 
picture of the impacts of

[[Page 69832]]

energy conservation standards.\4\ DOE's approach is based on the 
calculation of an FFC multiplier for each of the energy types used by 
covered products or equipment. For more information on FFC energy 
savings, see section IV.G of this document.
---------------------------------------------------------------------------

    \4\ The FFC metric is discussed in DOE's statement of policy and 
notice of policy amendment. 76 FR 51282 (Aug. 18, 2011), as amended 
at 77 FR 49701 (Aug. 17, 2012).
---------------------------------------------------------------------------

2. Significance of Savings
    In determining whether amended standards are needed, DOE must 
consider whether such standards will result in significant conservation 
of energy. (42 U.S.C. 6295(m)(1)(A)) The significance of energy savings 
offered by a new or amended energy conservation standard cannot be 
determined without knowledge of the specific circumstances surrounding 
a given rulemaking.\5\ For example, some covered products and equipment 
have most of their energy consumption occur during periods of peak 
energy demand. The impacts of these products on the energy 
infrastructure can be more pronounced than products with relatively 
constant demand. Accordingly, DOE evaluates the significance of energy 
savings on a case-by-case basis.
---------------------------------------------------------------------------

    \5\ The numeric threshold for determining the significance of 
energy savings established in a final rule published on February 14, 
2020 (85 FR 8626, 8670) was subsequently eliminated in a final rule 
published on December 13, 2021 (86 FR 70892).
---------------------------------------------------------------------------

G. Additional Considerations

    Pursuant to EPCA, absent DOE publishing a notification of 
determination that energy conservation standards for furnace fans do 
not need to be amended, DOE must issue a NOPR that includes new 
proposed standards. (42 U.S.C. 6295(m)(1)(B)). The new proposed 
standards in any such NOPR must be based on the criteria established 
under 42 U.S.C. 6295(o) and follow the procedures established under 42 
U.S.C. 6295(p). (42 U.S.C. 6295(m)(1)(B)). The criteria in 42 U.S.C. 
6295(o) require that standards be designed to achieve the maximum 
improvement in energy efficiency, which the Secretary determines is 
technologically feasible and economically justified. (42 U.S.C. 
6295(o)(2)(A)). In deciding whether a proposed standard is economically 
justified, DOE must determine whether the benefits of the standard 
exceed its burdens. (42 U.S.C. 6295(o)(2)(B)(i)). DOE must make this 
determination after receiving comments on the proposed standard, and by 
considering, to the greatest extent practicable, the following seven 
statutory factors:
    (1) The economic impact of the standard on manufacturers and 
consumers of the products subject to the standard;
    (2) The savings in operating costs throughout the estimated average 
life of the covered products in the type (or class) compared to any 
increase in the price, initial charges for, or maintenance expenses of 
the covered products that are likely to result from the standard;
    (3) The total projected amount of energy (or as applicable, water) 
savings likely to result directly from the standard;
    (4) Any lessening of the utility or the performance of the covered 
products likely to result from the standard;
    (5) The impact of any lessening of competition, as determined in 
writing by the Attorney General, that is likely to result from the 
standard;
    (6) The need for national energy and water conservation; and
    (7) Other factors the Secretary considers relevant.

(42 U.S.C. 6295(o)(2)(B)(i)(I)-(VII))

IV. Methodology and Discussion of Related Comments

    This section addresses the analyses DOE has performed for this 
proposed determination with regard to consumer furnace fans. Separate 
subsections address each component of DOE's analyses. DOE used several 
analytical tools to estimate the impact of potential energy 
conservation standards. The first tool is a spreadsheet that calculates 
the LCC savings and PBP of potential energy conservation standards. The 
NIA uses a second spreadsheet set that provides shipments projections 
and calculates NES and net present value of total consumer costs and 
savings expected to result from potential energy conservation 
standards. These spreadsheet tools are available on the website: 
www.regulations.gov/docket/EERE-2021-BT-STD-0029.

A. Market and Technology Assessment

    DOE develops information in the market and technology assessment 
that provides an overall picture of the market for the products 
concerned, including the purpose of the products, the industry 
structure, manufacturers, market characteristics, and technologies used 
in the products. This activity includes both quantitative and 
qualitative assessments, based primarily on publicly available 
information. The subjects addressed in the market and technology 
assessment for this proposed determination include (1) a determination 
of the scope and product classes, (2) manufacturers and industry 
structure, (3) existing efficiency programs, (4) shipments information, 
(5) market and industry trends, and (6) technologies or design options 
that could improve the energy efficiency of consumer furnace fans. The 
key findings of DOE's market assessment are summarized in the following 
sections.
1. Scope of Coverage
    In this analysis, DOE relied on the definition of consumer furnace 
fans in 10 CFR 430.2, which defines a consumer furnace fan as an 
electrically-powered device used in a consumer product for the purpose 
of circulating air through ductwork. Any product meeting the definition 
of consumer furnace fans is included in DOE's scope of coverage, though 
not all products within the scope of coverage may be subject to 
standards.
    For this NOPD, DOE evaluated products within the same scope as 
those products for which DOE initially established energy conservation 
standards in the final rule published on July 3, 2014 (``July 2014 
Final Rule''). 79 FR 38130. Products evaluated in this NOPD include:
     Furnace fans used in weatherized and non-weatherized gas 
furnaces, oil furnaces, and electric furnaces; and
     Modular blowers.
    Consistent with the approach taken in the July 2014 Final Rule, 
products not addressed in this rulemaking include:
     Furnace fans used in other products, such as split-system 
central air conditioner (``CAC'') and heat pump indoor units, through-
the-wall indoor units, small duct high-velocity indoor units, energy 
recovery ventilators, heat recovery ventilators, draft inducer fans, 
exhaust fans, or hydronic air handlers; and
     Fans used in any non-ducted products, such as whole-house 
ventilation systems without ductwork, CAC condensing unit fans, room 
fans, and furnace draft inducer fans because these products do not 
circulate air through ductwork.
    DOE has previously determined that the DOE test procedure for 
furnace fans is not currently equipped to address fans contained in 
CACs, heat pumps, or other products. 79 FR 38130, 38149. Therefore, DOE 
has not established standards covering such products. (42 U.S.C. 
6295(o)(3)) Any products that are non-ducted or that do not move air 
through ductwork (e.g., draft inducer fans) would not meet the 
definition of a furnace fan and are therefore out of scope of the 
existing regulations.
    In response to the November 2022 Preliminary Analysis, AHRI 
commented that fans used in packaged units should be excluded from the 
analysis as the energy use is already accounted for in the products' 
seasonal energy efficiency

[[Page 69833]]

ratio (``SEER'') rating. AHRI stated that including these products in 
the analysis of the overall quad savings would double count their 
contribution because they are accounted for in prior rulemakings. 
(AHRI, No. 23 at p. 4) Morrison commented that it does not see the need 
for DOE to include fans used in packaged units within the furnace fans 
rulemaking, as their energy use is already accounted for in SEER and 
heating seasonal performance factor (``HSPF'') ratings and excluding 
them from the rulemaking would prevent unnecessary repetition across 
rulemaking documents. (Morrison, No. 27 at p. 2) In response, DOE notes 
that for certain packaged units--WG-NC--there are existing standards at 
10 CFR 430.32. In the July 2014 Final Rule, DOE assessed these products 
and established energy conservation standards for them. 79 FR 38130, 
38209. As discussed in section II.A of this document, DOE must 
periodically review its already established energy conservation 
standards for consumer furnace fans no later than 6 years from the 
issuance of a final rule establishing or amending a standard for 
consumer furnace fans. (42 U.S.C. 6295(m)) In accordance with these 
provisions, DOE evaluated these products for this NOPD. DOE notes that 
the base-case efficiency distribution of fans used in the analysis 
includes presence of more-efficient furnace fans (e.g., with BPM 
motors) in homes with higher-efficiency packaged units due to impacts 
from previous rulemakings. Because the energy savings considered from 
the furnace fan efficiency levels are measured relative to the base-
case efficiencies, the savings calculated in this analysis are over and 
above those counted in previous rulemakings. Therefore, savings have 
not been double counted.
    The CA IOUs further commented that DOE has previously noted that 
the provisions in 42 U.S.C. 6295(f)(4)(D) can encompass any 
electrically-powered devices used in residential HVAC products, 
including furnaces, and recommended that DOE investigate the savings 
opportunity for regulating furnace fans in air handlers. (Id.) Finally, 
the CA IOUs commented that many residential air handlers are offered 
for sale with permanent split-capacitor-equipped fans and are likely 
unable to meet the current rating for fan energy conservation standards 
applicable to furnace fans. They added that manufacturers readily offer 
air handlers with BPM motors and, therefore, a baseline technology 
option incorporating a BPM motor is likely feasible for air handlers. 
(Id. at pp. 5-6)
    For the reasons discussed in the May 2022 TP NOPR, DOE is not 
proposing to include fans used in other types of HVAC products, 
including air-handlers, within the scope of coverage of appendix AA. 87 
FR 29576, 29580. In the May 2022 TP NOPR, DOE tentatively concluded 
that the electrical energy consumption of fans used in the 
aforementioned types of HVAC products are accounted for by the seasonal 
energy efficiency ratio 2 (``SEER2'') and heating seasonal performance 
factor 2 (``HSPF2'') metrics measured by the test procedure for CACs 
and heat pumps at appendix M1 to subpart B of part 430 (``appendix 
M1''). 87 FR 29576, 29580. Therefore, DOE did not include air handlers 
in the scope of the test procedure rulemaking and likewise did not 
include them in this furnace fans rulemaking.
    NEEA commented that it supported expanding coverage of furnace fans 
to include NWO-NC products in the analysis because of the persistence 
of this product class on the market and so the regulations would be 
more inclusive of the entire market and prevent any unfair advantage 
due to a gap in the regulations. NEEA also recommended that DOE include 
mobile home non-weatherized, non-condensing furnace fans as a covered 
product class, which, along with including NWO-NC, would encourage the 
transition to BPM motors across the furnace fan market. (NEEA, No. 24 
at pp. 1-2) NEEA recommended that DOE add additional classes, such as 
non-weatherized, condensing oil (``NWO-C'') and weatherized, condensing 
gas (``WG-C''), to cover the entire consumer furnace fans market. (Id. 
at p. 2) Lennox commented that it finds the market impact of MH-NWO or 
WG-C furnace fans to be extremely low with minimal energy saving 
potential. (Lennox, No. 24 at p. 4)
    DOE notes that, because it is not proposing amended standards at 
this time, it is not proposing to assign new standards to any product 
classes and will retain those classes for which standards currently 
exist, as shown in Table II.1. For NWO-NC furnace fans, standards 
currently exist and these products were included in this analysis. DOE 
also analyzed MH-NWO-NC furnace fans for the purposes of making this 
proposed determination. For other types of furnace fans, such as NWO-C 
and WG-C furnace fans, DOE is only aware of a very small number of 
products on the market. DOE has tentatively concluded that given the 
nascent and developing state of these products it would be premature to 
analyze proposed energy conservation standards at this time. Additional 
information on the product classes analyzed for this NOPD is included 
in section IV.A.4 of this document.
2. Technology Options
    In the November 2022 Preliminary Analysis, DOE identified several 
technology options that would be expected to improve the efficiency of 
consumer furnace fans, as measured by the DOE test procedure. 
Specifically, DOE identified the following technology options as having 
the potential to improve the FER rating of consumer furnace fans (as 
measured in accordance with appendix AA), and considered these 
technology options further in the screening analysis:

 Housing design modifications
 Multi-stage heating components and controls \6\
---------------------------------------------------------------------------

    \6\ Although multi-stage heating components and controls were 
included in the list of technologies that can improve FER, DOE 
stated that DOE has tentatively found that multi-stage heating 
controls may not significantly improve furnace fan efficiency as 
measured by FER. See chapter 3 and chapter 5 of the Preliminary 
Analysis TSD.
---------------------------------------------------------------------------

 Airflow path design
 Constant-torque BPM (``CT-BPM'') and constant-airflow BPM 
(``CA-BPM'') motors
 Inverter controls for permanent split capacitor (``PSC'') 
motors
 Higher-efficiency fan blades

    These technology options are described in detail in section 3.3.2 
of the TSD accompanying the November 2022 Preliminary Analysis. In 
response to the November 2022 Preliminary Analysis, DOE received 
several comments related to these technology options. Several 
commenters supported DOE's tentative decision to analyze CT-BPM and CA-
BPM motors together as a single design option because these motors 
appear to have comparable efficiency as measured by DOE's test 
procedure.
    Lennox commented that CT-BPM and CA-BPM motors have similar 
efficiencies. Lennox stated that while there can be minor differences 
in the efficiency of BPM motors, they fall within a very narrow band 
for potential improvement. Lennox commented that the primary 
differences in performance are that a CT-BPM motor will result in 
reduced airflow as static pressure increases, whereas a CA-BPM motor 
will increase speed and power consumption to maintain airflow up to the 
limit of the motor capability. Lennox commented that motor efficiency 
as applied is more of a topographical map than a single point of 
operation and that BPM motors maintain efficiency

[[Page 69834]]

performance over their operating range. (Lennox, No. 24 at p. 5)
    Additionally, AHRI commented that constant torque and constant 
airflow motors are similarly constructed but operate differently. AHRI 
commented that, given consistent external static pressure and airflow, 
AHRI assumes the two motor types would perform comparably within the 
expected margins of error. (AHRI, No. 23 at pp. 4-5) Carrier also 
commented that it agrees with DOE's assumption that CT-BPM and CA-BPM 
motors have comparable efficiencies and stated that the motors use 
similar construction despite being operated differently. Carrier 
commented that if a furnace with a CT-BPM motor were compared to a 
furnace with a similarly sized CA-BPM motor where both were operated at 
the same external static pressure and airflow, these motor types would 
consume the same amount of energy. (Carrier, No. 19 at p. 2) In 
response to Lennox, AHRI, and Carrier, DOE notes that it continued to 
analyze CT-BPM and CA-BPM motors together as a single design option for 
this current analysis.
    Beach recommended that DOE include efficiency testing and standards 
in rudimentary equipment configuration descriptions. Beach recommended 
that DOE outline where and how the fan motor is placed within the 
equipment to avoid efficiency degradation at the spot where full 
furnace air flow deposits airstream dust and material on the motor 
windings. Beach commented that filter bypass, at a minimum, applies. 
(Beach, No. 16 at p. 1)
    In response to comments from Beach, DOE notes that its energy 
conservation standards are in terms of FER, which is a performance-
based metric that captures the estimated annual electrical energy 
consumption of the furnace fan normalized by: (a) the estimated total 
number of annual fan operating hours and (b) the airflow in the maximum 
airflow-control setting. DOE does not prescribe any design requirements 
for furnace fans and therefore specifying the placement and 
installation of the furnace fan within a furnace unit is out of the 
scope of DOE's regulations.
    In the November 2022 Preliminary Analysis TSD, DOE stated that it 
tentatively did not consider two-stage and multi-stage technology 
options as a design pathway for improving FER in the engineering 
analysis based on manufacturer feedback, certification data, and 
testing. DOE requested data or comment regarding the relationship 
between staging and FER.
    In response, AHRI commented that without performing a controlled 
study, it is difficult to properly compare a single-stage product to a 
two-stage product. AHRI commented that variables such as airflow design 
and temperature rise can affect the comparison, adding that it would be 
incorrect to generalize that one control type would have a distinct 
advantage over another. (AHRI, No. 23 at p. 5) Carrier commented that 
there is not adequate data to conclude whether single-stage and multi-
stage controls result in different FER ratings. Carrier commented that 
comparison between the two control types is not straightforward due to 
multiple design characteristics that make each furnace model unique. 
Carrier stated that a controlled study is needed to eliminate variables 
that are unique to each model, such as airflow design and temperature 
rise selected. (Carrier, No. 19 at p. 2) Carrier also commented that it 
generally has not found multi-staging to improve FER ratings and that 
it does not believe one control type has a distinct advantage over the 
other. (Id.)
    Trane commented that the assumption that FER values for a multi-
stage furnace and a single-stage furnace are equal contradicts the 2014 
TSD (EERE-2010-BT-STD-001-0111), which states that multi-staging was a 
technology option that significantly differed from the single-stage 
furnace. Trane commented that this difference affects the energy use 
equations, as the FER was calculated with a multi-stage furnace and 
energy use was calculated with a single-stage furnace. (Trane, No. 22 
at p. 3)
    Morrison questioned whether the lack of a benefit from multi-
staging is due to FER not appropriately capturing real energy use. 
Morrison commented that, based on research presented in Canada's C823 
efforts, average furnaces are oversized and rarely run at full 
capacity, leading them to use more fan energy than necessary. Morrison 
stated that part load operation would reduce the energy impact from 
oversizing and hence reduce fan energy use, and stated it is unclear 
why this option has been deemed not to be of benefit. (Morrison, No. 27 
at p. 2)
    DOE agrees with commenters that there are uncertainties related to 
the effectiveness of two-stage or multi-stage in improving FER. 
However, DOE has not received any additional data to support or 
disprove any impacts on FER between single and multi-stage units. 
Therefore, DOE has retained multi-stage heating components and controls 
as a technology option in the current analysis but, as discussed in 
section IV.B.1.a of this document, DOE did not consider two-stage or 
multi-stage operation as a design pathway for improving FER in the 
engineering analysis.
3. Impact From Other Rulemakings
    Lennox commented that DOE needs to consider the total cumulative 
regulatory burden for consumer furnaces, as there are multiple 
concurrent DOE, EPA, and other regulatory actions undergoing updates. 
(Lennox, No. 24 at pp. 8-9) Lennox stated that DOE's consideration of 
cumulative regulatory burden has often been cursory and provided a list 
of relevant regulations: ``2023 DOE Energy Conservation Standards 
(``ECS'') change for central air conditioners; 2023 DOE Energy 
Conservation Standard change for commercial air conditioners; 2023 DOE 
ECS for commercial warm air furnaces (``CWAFs''); EPA phase-down to 
lower GWP refrigerants to meet the American Innovation and 
Manufacturing (``AIM'') Act objectives; DOE ECS Furnace Standards 
rulemaking; National and Regional Cold Climate Heat Pump 
Specifications; DOE ECS for Three-Phase, Below 65,000 Btu/h; DOE Test 
Procedure for VRF Systems; EPA Energy Star 6.0+ for Residential HVAC; 
and EPA Energy Star 4.0 for Light Commercial HVAC.'' (Id.) Lennox 
stated that proposing amended consumer furnace fan standards would 
contribute to the significant cumulative regulatory burden. (Id. at p. 
9) Lennox commented that DOE needs to thoroughly consider the total 
cumulative regulatory burden association with any consideration of 
amended FER standards. Lennox commented that furnace manufacturers are 
in the midst of unprecedented regulatory change regarding equipment 
they manufacture. Lennox commented that these significant cumulative 
regulatory burdens provide another reason why DOE should not add 
additional burden by tightening consumer furnace fan regulations. 
Lennox reiterated that the fans are components in furnaces already 
regulated by DOE. (Id. at pp. 8-9)
    AHRI asserted that DOE did not consider the impact of other ongoing 
rulemakings (e.g., the notice of proposed rulemaking for consumer 
furnaces). (AHRI, No. 23 at p. 1) Morrison stated that it supports the 
comments submitted by AHRI advocating for the HVAC industry, as the 
burden for furnace manufacturers to meet compliance will be high. 
Morrison commented that the added burden of furnace fan ratings will 
challenge imminent regulations and an industry overloaded with 
regulations already underway, and that the schedule of regulations 
impedes manufacturers from attempting new

[[Page 69835]]

product development and innovation. (Morrison, No. 27 at pp. 1-2)
    DOE is not proposing to amend the energy conservation standards for 
consumer furnace fans and therefore does not expect this rulemaking to 
contribute to the cumulative regulatory burden of manufactures.
    Lennox also commented that it opposes DOE expanding the regulatory 
scope for electric motors into air-over motors, synchronous motors and 
inverter-only motors, and expanded scope electric motors (ESEMs), in 
particular when those motors are contained in already-regulated 
heating, ventilation, air conditioning, and refrigeration (``HVACR'') 
products. Lennox commented that DOE should continue to exempt air-over 
and inverter-only motors (including AC and synchronous motors) from 
component-level energy conservation standards regulation when these 
motors are used in HVACR equipment already regulated at the systems 
level. Lennox stated that DOE notes in the October 2022 Electric Motor 
Test Procedure Final Rule (87 FR 63588) that an industry test procedure 
DOE incorporated by reference is ``not applicable to air-over electric 
motors that are synchronous electric motors and to air-over electric 
motors that are inverter-only'' (10 CFR 431.25(I)). AHRI commented that 
DOE should refer to the comments made by NEMA on the energy 
conservation standards for Fans and Blowers on the issues surrounding 
setting multiple standards for the same product under different 
rulemakings in regards to the interaction between the furnace fan 
rulemaking and the ESEMs rulemaking. (AHRI, No. 23 at p. 5)
    In the ESEM rulemaking, DOE is considering including expanded scope 
electric motors including certain permanent split capacitor (PSC) 
motors that exceed 0.25 horsepower and are single-speed. DOE 
understands that the vast majority of furnace fans use either 
electrically commutated motors (i.e., ``ECMs'' which are also referred 
to as BPM motors in this rulemaking) or are multiple-speed PSC motors, 
both of which are out of the preliminary scope of the ESEM rulemaking. 
Thus, furnace fans using BPM motors or multiple-speed PSC motors will 
not be impacted by the ESEM rulemaking.\7\
---------------------------------------------------------------------------

    \7\ See Docket EERE-2020-BT-STD-0007.
---------------------------------------------------------------------------

Screening Analysis
    DOE uses the following five screening criteria to determine which 
technology options are suitable for further consideration in an energy 
conservation standards rulemaking:
    (1) Technological feasibility. Technologies that are not 
incorporated in commercial products or in commercially viable, existing 
prototypes will not be considered further.
    (2) Practicability to manufacture, install, and service. If it is 
determined that mass production of a technology in commercial products 
and reliable installation and servicing of the technology could not be 
achieved on the scale necessary to serve the relevant market at the 
time of the projected compliance date of the standard, then that 
technology will not be considered further.
    (3) Impacts on product utility. If a technology is determined to 
have a significant adverse impact on the utility of the product to 
subgroups of consumers, or result in the unavailability of any covered 
product type with performance characteristics (including reliability), 
features, sizes, capacities, and volumes that are substantially the 
same as products generally available in the United States at the time, 
it will not be considered further.
    (4) Safety of technologies. If it is determined that a technology 
would have significant adverse impacts on health or safety, it will not 
be considered further.
    (5) Unique-pathway proprietary technologies. If a technology has 
proprietary protection and represents a unique pathway to achieving a 
given efficiency level, it will not be considered further, due to the 
potential for monopolistic concerns.

10 CFR part 430, subpart C, appendix A, sections 6(b)(3) and 7(b).

    In summary, if DOE determines that a technology, or a combination 
of technologies, fails to meet one or more of the listed five criteria, 
it will be excluded from further consideration in the engineering 
analysis.
a. Screened-Out Technologies
    In the November 2022 Preliminary Analysis, DOE tentatively screened 
out housing design modifications and changes to airflow path designs 
from its analysis. In response, Lennox agreed with DOE's determination 
to screen out housing designs and airflow paths that could impact the 
thermal performance of the furnace and decrease consumer utility. 
(Lennox, No. 24 at p. 5) Carrier also indicated agreement with DOE's 
decision to screen out improved housing designs and airflow path 
designs due to their impact on overall product size, stating that they 
could adversely impact consumer utility and the practicality of making 
replacement installations. Additionally, Carrier agreed there is no 
quantitative data suggesting specific housing design changes provide 
efficiency improvements in the same cabinet width. (Carrier, No. 19 at 
p. 3)
    The Joint Commenters commented that additional design options that 
increase efficiency beyond a backward-inclined impeller are currently 
available on the market. The Joint Commenters stated that airflow path 
and fan housing improvements represent potential options for improving 
furnace fan efficiency but noted that DOE screened out these design 
modifications since they could impact the thermal performance of the 
furnace. The Joint Commenters acknowledged this concern, but noted that 
one of the models exceeding EL 1 is used in a condensing furnace with 
an AFUE of 97 percent, suggesting manufacturers may be able to optimize 
the furnace fan efficiency without negatively impacting the efficiency 
of the furnace itself. The Joint Commenters recommended that DOE 
continue investigating furnace fan efficiencies and how certain design 
features on the current market permit furnace fan FER levels below 
those analyzed in the TSD. (Joint Commenters, No. 20 at pp. 2-3)
    As discussed in section IV.A.2 of this document, airflow path and 
fan housing improvements can improve furnace fan efficiencies. However, 
as discussed in chapter 4 of the November 2022 Preliminary Analysis 
TSD, DOE does not have data that quantifies the impact of housing 
design modifications on FER. Additionally, DOE has found that the 
airflow path design can impact the performance of the larger furnace 
system with possible changes to the furnace efficiency as measured in 
AFUE. Though condensing furnaces can achieve lower FERs, DOE currently 
lacks the data necessary to conclude that these options will not reduce 
utility to consumers, and therefore has continued to screen out these 
technologies for this analysis.
    Several commenters also suggested that backward-inclined impeller 
should be screened out of the current analysis. AHRI, Trane, Lennox, 
and Daikin raised concerns about the technological feasibility of 
backward-inclined impellers. AHRI commented that further analysis of 
backward-inclined impellers is needed, stating that while backward-
inclined impellers can be considered a

[[Page 69836]]

mature technology in some products, it is nascent at best for consumer 
furnaces. AHRI commented that the analysis performed in the TSD does 
not capture the current state of this technology. (AHRI, No. 23 at pp. 
2-3) Trane commented that the necessary backward-inclined impeller is 
not available for purchase and is therefore unavailable to furnace 
manufacturers for use in testing. (Trane, No. 22 at p. 2) Lennox 
commented that backward-inclined impellers are nascent technology for 
consumer furnaces and may not be practical for many installations. 
Lennox commented that DOE's analysis does not accurately portray the 
current state of this technology regarding residential furnace fans. 
Lennox stated that current furnace designs are much more compact than 
when DOE conducted research regarding backward-inclined impellers and 
there is now less space to accommodate furnace fans. Lennox commented 
that including backward-inclined impellers would require changes to the 
housing design and airflow patterns, which DOE screened out in the TSD. 
Lennox further commented that backward-inclined impellers are not a 
one-size-fits-all application. Lennox stated that changing the airflow 
design would require redesign and retesting on a model-by-model basis 
to ensure proper operation, compliance with safety standards, and 
product reliability. (Lennox, No. 24 at pp. 5-6) Daikin commented that 
replacing a forward-curved impeller with a backward-curved impeller may 
change the ESP of the unit and require that the unit use a larger 
blower wheel. Daikin commented that increasing the blower wheel 
diameter requires a change to the blower housing design, which was a 
technology option DOE screened out in the preliminary analysis. Daikin 
recommended that DOE evaluate the impact of backward-inclined impellers 
on furnace ESP. (Daikin, No. 26 at pp. 21-22) Rheem requested to know 
whether DOE had considered the impact of the backward-inclined impeller 
system on other furnace components, such as the evaporator coil or 
other accessories. (Rheem, No. 26 at p. 23) In contrast to these 
comments, Carrier stated that it uses backward-inclined impellers in 
non-weatherized gas furnaces that have 14-inch cabinets and AFUE 
ratings of 95 percent or higher. (Carrier, No. 19 at p. 1)
    Manufacturers also raised concerns about potential impacts on the 
utility and safety of furnaces if backward-inclined impellers are used 
as a technology option. Carrier commented that its experiences suggest 
backward-inclined impellers significantly change the air profile 
through the furnace and, to maintain safety and reliability, the 
airflow must be redirected, adding that this can reduce the performance 
improvement from the impeller change. Carrier further commented that in 
applications where a larger impeller diameter cannot be accommodated, 
the increased rotational speed increases the operation noise of the 
furnace, adding that the noise generated from fan operation is an 
important performance selection criterion to consumers. (Carrier, No. 
19 at p. 3) Lennox commented that backward-inclined impellers present 
many design challenges. Lennox noted that backward-inclined impellers 
must have significantly higher tip speeds, which require either a 
larger impeller diameter or higher rotational speed. However, Lennox 
commented that the required speed increase is outside the normal range 
of motors applied in furnace fans and would be likely to increase sound 
levels and reduce consumer utility. (Lennox, No. 24 at p. 6)
    In response to these concerns, DOE notes that, even if there are 
only a limited number of commercially available product designs that 
incorporate backward-inclined impellers, they are sufficient to 
demonstrate technological feasibility as defined by EPCA. 10 CFR part 
430, subpart C, appendix A, sections 6(b)(3)(i). Similarly, because 
these technologies are used in commercialized designs, DOE has 
determined that they can be implemented safely and reliably and with a 
noise level that is acceptable to consumers. DOE agrees, however, that 
there may be potential costs associated with potential redesign and 
retesting to ensure safety and to ensure acceptable noise levels, and 
this issue is discussed further in section IV.H of this document.
    Therefore, for the current analysis, DOE tentatively screened out 
housing design modifications and changes to airflow path designs from 
its analysis but did not screen out backward-inclined impellers.
b. Remaining Technologies
    After reviewing each technology, DOE did not screen out the 
following technology options and considers them as design options in 
the engineering analysis:

(1) Multi-stage heating components and controls
(2) High-efficiency fan motors (i.e., use of BPM fan motors for product 
classes that currently use PSC motors)
(3) Inverter controls for PSC motors
(4) Higher-efficiency fan blades (backward-inclined impellers)

    DOE determined that these technology options are technologically 
feasible because they are being used or have previously been used in 
commercially available products or working prototypes. DOE also finds 
that all of the remaining technology options meet the other screening 
criteria (i.e., practicable to manufacture, install, and service and do 
not result in adverse impacts on consumer utility, product 
availability, health, or safety).
4. Product Classes
    In general, when evaluating and establishing energy conservation 
standards, DOE divides the covered product into classes by (1) the type 
of energy used, (2) the capacity of the product, or (3) any other 
performance-related feature that affects energy efficiency and 
justifies different standard levels, considering factors such as 
consumer utility. (42 U.S.C. 6295(q))
    DOE currently categorizes furnace fans into 10 product classes. 
EPCA specifies criteria for product class separation which include: (1) 
the type of energy consumed; (2) capacity; or (3) other performance-
related features that justify a higher or lower energy conservation 
standard. 42 U.S.C. 6295(q) The 10 product classes currently 
established by DOE are differentiated by performance related features, 
including internal structure and application-specific design 
differences, as presented in Table IV.1. For this NOPD, DOE maintained 
these 10 classes, with the exception of a change to the mobile home 
non-weatherized oil furnace fan (MH-NWO) class discussed hereinafter.

[[Page 69837]]



            Table IV.1--Existing Furnace Fan Product Classes
------------------------------------------------------------------------
                              Product class
-------------------------------------------------------------------------
Non-weatherized, Non-condensing Gas Furnace Fan (NWG-NC).
Non-weatherized, Condensing Gas Furnace Fan (NWG-C).
Mobile Home Non-Weatherized, Non-condensing Gas Furnace Fan (MH-NWG-NC).
Mobile Home Non-Weatherized, Condensing Gas Furnace Fan (MH-NWG-C).
Mobile Home Electric Furnace/Modular Blower Fan (MH-EF/MB).
Non-Weatherized, Non-Condensing Oil Furnace Fan (NWO-NC).
Weatherized Non-Condensing Gas Furnace Fan (WG-NC).
Electric Furnace/Modular Blower Fan (EF/MB).
Mobile Home Weatherized Non-Condensing Gas Furnace Fan (MH-WG).*
Mobile Home Non-Weatherized Oil Furnace Fan (MH-NWO).*
------------------------------------------------------------------------
* DOE created the MH-NWO and MH-MG product classes in the July 2014
  Final Rule, but these classes do not currently have energy
  conservation standards.

    Each product class title includes descriptors that indicate the 
internal structure and application-specific performance related 
features of its included products. As directed by EPCA, DOE must 
specify a different standard level for a type or class of products that 
has the same function or intended use if DOE determines that products 
within such group: (A) consume a different kind of energy from that 
consumed by other covered products within such type (or class); or (B) 
have a capacity or other performance-related feature which other 
products within such type (or class) do not have and such feature 
justifies a higher or lower standard. (42 U.S.C. 6295(q)(1)) 
Weatherized and non-weatherized are descriptors that indicate whether 
the HVAC product is installed outdoors or indoors, respectively. Design 
constraints are different for products installed indoors compared to 
outdoors, which impact furnace fan performance because furnace fan 
energy consumption is dependent on clearances and airflow path 
Weatherized products are packaged products that also include an 
internal evaporator coil, while non-weatherized products are not 
shipped with an evaporator coil but may be designed to be paired with 
one. The presence of an evaporator coil increases internal static 
pressure and impacts furnace fan performance and energy consumption. 
Weatherization (i.e., the ability to be installed outdoors) is 
therefore a performance-related feature as outlined by EPCA.
    Condensing refers to the presence of a secondary, condensing heat 
exchanger in addition to the primary combustion heat exchanger in 
certain furnaces. The presence of a secondary heat exchanger improves 
the AFUE of a consumer furnace but also increases internal static 
pressure. As a result, DOE expects that furnace fans used in condensing 
units will consume more electrical energy than similar, non-condensing 
units, and therefore use with condensing technology constitutes a 
performance-related feature for this product. Mobile home products meet 
certain design requirements that allow them to be installed in mobile 
homes. They require direct venting and are typically installed without 
return air ducting. As a result, furnace fans used in mobile home 
products consume a different amount of electric energy than furnace 
fans installed in similar HVAC products that are designed for site-
built applications. Therefore, the ability to be installed in mobile 
home applications is a performance-related feature under EPCA.
    Descriptors like gas, oil, or electric indicate the type of fuel 
that the HVAC product uses to produce heat, which determines the type 
and geometry of the primary heat exchanger used in the HVAC product. 
Each heat exchanger geometry could result in a unique internal static 
pressure and therefore, have differing impacts on furnace fan 
performance and energy consumption and are considered performance-
related features.
    In the July 2014 Final Rule, DOE created product classes for MH-NWO 
furnace fans and MH-WG furnace fans, but DOE did not analyze or 
prescribe standards for either product class because of the lack of 
available data for those product classes. 79 FR 38130, 38150. DOE is 
not aware of any products that would be considered MH-WG furnace fans 
at this time. However, DOE has become aware of a limited number of MH-
NWO furnace fans that have been introduced to the market. The MH-NWO 
furnace fans that DOE identified are all used in non-condensing 
furnaces, so DOE analyzed a subset of the previously established but 
unanalyzed class--mobile home non-weatherized, oil, non-condensing (MH-
NWO-NC) furnace fans. DOE specifically considered MH-NWO-NC furnace 
fans because, as with furnace fans used in gas-fired products, DOE 
tentatively concluded that suitability for use with condensing 
technology would be a performance related feature that would justify 
further separating MH-NWO furnace fans into condensing and non-
condensing classes. Furnace fans used in oil-fired products that are 
non-condensing as compared to those that are condensing would have 
different performance due to likely differences in internal structure 
of condensing products (if any were to be developed). As such, 
suitability for use with condensing technology in a furnace fan is a 
performance-related feature under EPCA. As DOE is not aware of any 
condensing MH-NWO products, DOE did not analyze them for this NOPD 
analysis and instead focused on MH-NWO-NC furnace fans. In summary, DOE 
considered the product classes shown in the following list in its 
analysis.

(1) Non-weatherized, Non-condensing Gas Furnace Fan (NWG-NC)
(2) Non-weatherized, Condensing Gas Furnace Fan (NWG-C)
(3) Mobile Home Non-weatherized, Non-condensing Gas Furnace Fan (MH-
NWG-NC)
(4) Mobile Home Non-weatherized, Condensing Gas Furnace (MH-NWG-C)
(5) Mobile Home Electric Furnace/Modular Blower Fan (MH-EF/MB)
(6) Non-weatherized, Non-condensing Oil Furnace Fan (NWO-NC)
(7) Weatherized Non-Condensing Gas Furnace Fan (WG-NC)
(8) Electric Furnace/Modular Blower (EF/MB)
(9) Mobile Home Non-Weatherized, Non-Condensing Oil Furnace Fan (MH-
NWO-NC)

B. Engineering Analysis

    The purpose of the engineering analysis is to establish the 
relationship between the efficiency and cost of consumer furnace fans. 
There are two elements to consider in the engineering

[[Page 69838]]

analysis; the selection of efficiency levels to analyze (i.e., the 
``efficiency analysis'') and the determination of product cost at each 
efficiency level (i.e., the ``cost analysis''). In determining the 
performance of higher-efficiency products, DOE considers technologies 
and design option combinations not eliminated by the screening 
analysis. For each product class, DOE estimates the baseline cost, as 
well as the incremental cost for the product at efficiency levels above 
the baseline. The output of the engineering analysis is a set of 
manufacturer production costs (``MPCs'') in cost-efficiency ``curves'' 
that are used in downstream analyses (i.e., the LCC and PBP analyses 
and the NIA).
1. Efficiency Analysis
    DOE typically uses one of two approaches to develop energy 
efficiency levels for the engineering analysis: (1) relying on observed 
efficiency levels in the market (i.e., the efficiency-level approach), 
or (2) determining the incremental efficiency improvements associated 
with incorporating specific design options to a baseline model (i.e., 
the design-option approach). Using the efficiency-level approach, the 
efficiency levels established for the analysis are determined based on 
the market distribution of existing products (in other words, based on 
the range of efficiencies and efficiency level ``clusters'' that 
already exist on the market). Using the design option approach, the 
efficiency levels established for the analysis are determined through 
detailed engineering calculations and/or computer simulations of the 
efficiency improvements from implementing specific design options that 
have been identified in the technology assessment. DOE may also rely on 
a combination of these two approaches. For example, the efficiency-
level approach (based on actual products on the market) may be extended 
using the design option approach to interpolate to define ``gap fill'' 
levels (to bridge large gaps between other identified efficiency 
levels) and/or to extrapolate to the ``max-tech'' level (particularly 
in cases where the ``max tech'' level exceeds the maximum efficiency 
level currently available on the market).
    Although FER data exists in DOE's Compliance Certification Database 
(``CCD'') for furnace fans currently subject to efficiency standards, 
DOE has determined through testing that for many furnace fan models, 
the rated FER values may not be representative of the model's actual 
performance. During confidential manufacturer interviews, several 
manufacturers confirmed that they rate the FER of their furnace fan 
products conservatively. Therefore, an efficiency level approach was 
not possible because the FER ratings of products currently available 
are largely not representative of their actual performance. Thus, DOE 
chose a design option approach to identify efficiency levels for the 
analysis in this proposed determination.
a. Baseline Efficiency Level
    For each product class, DOE generally selects a baseline model as a 
reference point for each class, and measures changes resulting from 
potential energy conservation standards against the baseline. The 
baseline model in each product class represents the characteristics of 
a product typical of that class (e.g., capacity, physical size). 
Generally, a baseline model is one that just meets current energy 
conservation standards, or, if no standards are in place, the baseline 
is typically the most common or least efficient unit on the market. For 
consumer furnace fans, the energy conservation standard sets a maximum 
energy usage requirement and therefore a baseline furnace fan's rated 
FER is just below or at the maximum FER threshold.
    DOE used baseline units for comparison in several analyses, 
including the engineering analysis, LCC analysis, PBP analysis, and 
NIA. To determine energy savings that will result from an amended 
energy conservation standard, DOE compared energy use at each of the 
higher efficiency levels to the energy consumption of the baseline 
unit. Similarly, to determine the changes in price to the consumer that 
will result from an amended energy conservation standard, DOE compared 
the prices of baseline units to the prices of units at each higher 
efficiency level.
    The identification of baseline units requires establishing the 
baseline efficiency level. In cases where there is an existing 
standard, DOE defines baseline units as units with efficiencies equal 
to the current Federal energy conservation standards. For MH-NWO-NC 
furnace fan product class, which does not currently have energy 
conservation standards, DOE developed the baseline equation by 
modifying the current energy conservation standards for the NWO-NC 
product class to account for the lower ESP experienced by mobile home 
units compared to other units. Specifically, DOE multiplied the y-
intercept (382) by 0.75, which was the conversion factor determined in 
the analysis for the July 2014 Final Rule that was previously used to 
calculate the MH-NWG-NC baseline based on the NWG-NC baseline.\8\
---------------------------------------------------------------------------

    \8\ Chapter 5 of the TSD accompanying the July 2014 Final Rule 
includes additional details about how this conversion factor was 
calculated. See docket no. EERE-2010-BT-STD-0011.
---------------------------------------------------------------------------

    Table IV.2 presents the maximum FER (i.e., the baseline level) for 
each product class of consumer furnaces analyzed in this preliminary 
analysis, as well as the typical characteristics of products at that 
level.

          Table IV.2--Baseline Efficiency Level FER and Associated Design Option for Each Product Class
----------------------------------------------------------------------------------------------------------------
              Product class                              Maximum FER                        Design option
----------------------------------------------------------------------------------------------------------------
Non-Weatherized, Non-Condensing Gas        0.044 * QMax + 182.....................  BPM Motor w/Forward Inclined
 Furnace Fan.                                                                        Impeller.
Non-Weatherized, Condensing Gas Furnace    0.044 * QMax + 195.....................  BPM Motor w/Forward Inclined
 Fan.                                                                                Impeller.
Weatherized, Non-Condensing Gas Furnace    0.044 * QMax + 199.....................  BPM Motor w/Forward Inclined
 Fan.                                                                                Impeller.
Non-Weatherized, Non-Condensing Oil        0.071 * QMax + 382.....................  Improved PSC Motor w/Forward
 Furnace Fan.                                                                        Inclined Impeller.
Non-Weatherized Electric Furnace Fan/      0.044 * QMax + 165.....................  BPM Motor w/Forward Inclined
 Modular Blower Fan.                                                                 Impeller.
Manufactured Home, Non-Weatherized, Non-   0.071 * QMax + 222.....................  Improved PSC Motor w/Forward
 Condensing Gas Furnace Fan.                                                         Inclined Impeller.
Manufactured Home, Non-Weatherized,        0.071 * QMax + 240.....................  Improved PSC Motor w/Forward
 Condensing Gas Furnace Fan.                                                         Inclined Impeller.
Manufactured Home, Non-Weatherized         0.044 * QMax + 101.....................  BPM Motor w/Forward Inclined
 Electric Furnace Fan/Modular Blower Fan.                                            Impeller.

[[Page 69839]]

 
Manufactured Home, Non-Weatherized Non-    0.071 * QMax + 287.....................  Improved PSC Motor w/Forward
 Condensing Oil Furnace Fan.                                                         Inclined Impeller.
----------------------------------------------------------------------------------------------------------------

    Products in the NWG-NC, NWG-C, WG-NC, NWEF/NWMB, and MH-EF/MB 
products classes are currently subject to the standards set in the July 
2014 Final Rule, in which the efficiency levels adopted were understood 
at that time to reflect models with CT-BPM motors and multi-stage 
operation. Products in the NWO-NC and MH-NWG-NC product classes are 
currently subject to the standards set in the July 2014 Final Rule in 
which the efficiency level adopted were understood to correspond to the 
performance associated with models including improved PSC motors and 
single-stage operation. Baseline products in the MH-NWO-NC product 
class were also found to correspond to performance associated with 
models including improved PSC motors and single-stage operation, based 
on DOE's market findings for mobile-home oil-fired units certified in 
DOE's CCD for consumer furnaces.
    Many furnaces include multi-stage or modulating heating controls. 
However, based on current furnace fan market data as well as feedback 
received during manufacturer interviews, it is unclear if these 
features impact furnace fan efficiency as measured by FER (see section 
IV.A.2). Therefore, DOE did not include the costs of multi-stage or 
modulating heating controls in the baseline design (i.e., DOE's MPC 
estimates reflect single-stage units). However, DOE did develop 
separate cost values for multi-stage or modulating heating controls 
that can be applied to the above costs to represent the addition of 
multi-stage or modulating heating controls (see section IV.B.2.b of 
this document). These additional cost values are used in DOE's LCC and 
PBP analyses in order to represent typical furnace fan cost 
distributions.
    In addition, the baseline motor technology is either BPM or PSC, 
depending on the product class. Manufacturers may choose a CABPM motor 
instead of a CTBPM, despite its relatively higher cost, to add comfort 
utility to their product. This additional comfort may be marketed as a 
premium feature. Therefore, DOE included the cost of a CT-BPM motor in 
the MPCs for furnace fans with BPM motors. DOE also developed cost 
values to represent the cost increase for CA-BPM motors relative to CT-
BPM motors (see section IV.B.2.b of this document). These values were 
applied in the LCC analysis to represent the distribution of BPM blower 
motor technologies expected on the market because, although DOE is not 
differentiating between CA-BPM motors and CT-BPM motors in terms of 
furnace fan efficiency, manufacturers and consumers may consider CA-BPM 
motors to be a premium feature that may offer comfort-related consumer 
utility benefits.
    In developing the cost-efficiency relationship, teardowns of 
baseline units were used as a reference point for determining the cost-
efficiency relationship of units with lower (more efficient) FERs. DOE 
compared the design features incorporated into products at the baseline 
efficiency to the features of units with higher energy efficiencies in 
order to determine the changes in manufacturing, installation, and 
operating costs that occur as FER decreases.
    In response to the November 2022 Preliminary Analysis, Morrison 
commented that DOE's estimation of FER values is conservative, based on 
data from OEMs and DOE, both of which indicate that analysis from 2014 
is not representative of current furnace fan function and composition. 
(Morrison, No. 27 at p. 2) Lennox commented that the use of BPM motors 
is required to meet current furnace fan efficiency standards for most 
consumer furnace fan categories and use of BPM motors is identified by 
DOE as the current baseline. (Lennox, No. 24 at p. 8)
    AHRI commented that baseline mobile home non-weatherized gas 
furnace fan technology is not representative of the market. AHRI stated 
that, in many cases, the current FER rating for mobile home non-
weatherized gas furnace fans cannot be met using a PSC motor, adding 
that these products already incorporate a BPM motor to meet Federal 
minimum standards. AHRI added that because mobile home non-weatherized 
gas furnace fans already incorporate BPM motors to meet the current 
levels, BPM motors will not be able to meet the FER minimums proposed 
at EL 1. (AHRI, No. 23 at p. 3) AHRI recommended that DOE validate the 
analysis performed for mobile home non-weatherized gas furnace fan to 
ensure the baseline and subsequent ELs are correct. (Id.)
    The Joint Commenters stated that current standards for both 
weatherized and non-weatherized non-condensing gas furnace fans were 
intended to effectively require use of efficient BPM motors, but stated 
that DOE's analysis shows some non-condensing gas furnace fans 
utilizing PSC motors can meet the current standards. The Joint 
Commenters noted that one currently available furnace/furnace fan model 
utilizes a PSC motor and is marketed as having a small footprint and 
DOE should investigate how this model and others are able to meet the 
current standards with presumably less efficient motors. (Joint 
Commenters, No. 20 at p. 2)
    The CA IOUs commented that they agree with DOE's decision to use 
the costs associated with constant-torque BPM and single-stage controls 
for its cost analysis for EL 1, adding that DOE has found several 
furnace fans on the market that meet EL 1. (CA IOUs, No. 21 at p. 2) 
The CA IOUs also noted that a 2017 California Codes and Standards 
Enhancement report evaluated air handlers sold with heat pumps and 
confirmed that while cabinet and blower design can affect internal 
resistance to airflow, a PSC motor can adversely affect fan efficacy. 
(Id. at p. 5)
    In response, DOE notes that it has developed baseline efficiency 
levels that are representative of the baseline technologies used in the 
current furnace fan market. While the FER ratings reported in CCMS are 
generally likely to be conservative estimates, DOE has conducted 
testing to understand the impacts of the technology options identified 
in section IV.A.2 on furnace fan efficiency, and has developed 
efficiency levels that reflect those impacts. DOE agrees with 
commenters that the use of BPM motors is necessary to meet the baseline 
for some product classes, as outlined in Table IV.2, but notes that 
some product classes can meet the baseline efficiency level using an 
improved PSC motor. In response to AHRI's comments, although DOE 
recognizes that many mobile home

[[Page 69840]]

furnaces use BPM motors, DOE is aware of mobile home furnaces on the 
market that use an improved PSC motor and meet the current FER 
standards. DOE thus concludes that FER standards can be achieved using 
this technology and has maintained improved PSC motors as a part of the 
baseline design option for mobile home furnaces. Conversely, DOE's 
market data shows that no non-weatherized gas furnaces currently on the 
market use PSC motors; DOE therefore concludes that a BPM motor 
continues to be an appropriate baseline motor design for this class.
b. Intermediate Efficiency Levels
    DOE analyzed intermediate efficiency levels for NWO-NC, MH-NWG-NC, 
MH-NWG-C, and MH-NWO-NC classes of consumer furnace fans. As discussed 
in section IV.B.1.c, DOE did not identify any efficiency levels between 
baseline and max-tech for the NWG-NC, NWG-C, WG-NC, NWEF/NWMB, and MH-
EF/MB classes. The intermediate efficiency levels identified are 
representative of efficiency levels where major technological changes 
occur (i.e., replacing PSC motors with BPM motors). As discussed in 
section IV.B.1.a of this document, DOE has tentatively found that CT-
BPM motors and CA-BPM motors have comparable impacts on FER ratings, 
and DOE has therefore only analyzed a single efficiency level 
reflecting the implementation of BPM motors. Additionally, DOE has 
tentatively used the assumption of a 12-percent reduction in FER for 
improved PSC motors and a 46-percent reduction in FER for models with a 
CT-BPM and multi-staging from the baseline used in the 2014 Final Rule 
(79 FR 38130, 38159) to calculate a 39-percent reduction in FER from 
improved PSC (the current baseline) to CT-BPM with multi-staging. The 
39-percent reduction in FER is implemented into the current analysis to 
represent the reduction in FER from improved PSC to a model with a CT-
BPM (regardless of staging) because DOE has tentatively decided not to 
include staging as a technology option that improves FER.
    In response to the November 2022 Preliminary Analysis, Lennox 
commented that the efficiency levels and design options associated with 
the use of forward curved impellers and BPM motors are reasonable. 
(Lennox, No. 24 at p. 7)
    The Joint Commenters commented that models with lower FERs than EL 
1 are available in each of the major furnace fan product classes. The 
Joint Commenters commented that, based on results in the CCD, both 
condensing and non-condensing non-weatherized furnace fans with 
efficiencies exceeding EL 1 are available across a broad range of 
airflows. The Joint Commenters stated that, as DOE acknowledged in the 
TSD, many manufacturers rate their furnace fans conservatively, which 
suggests the number of higher-efficiency furnace fans available on the 
market is understated. (Joint Commenters, No. 20 at pp. 1-2) 
Additionally, the Joint Commenters encouraged DOE to analyze an EL 
associated with improved BPM motor efficiency. The Joint Commenters 
stated that a range of BPM motor efficiencies currently exist on the 
market but added that DOE did not analyze improved motor efficiency as 
a potential design option. The Joint Commenters encouraged DOE to 
gather additional information from motor manufacturers to characterize 
the FER reductions achievable with the most efficient BPM motors 
available, and to analyze an EL associated with these higher efficiency 
BPM motors for the next stage of the rulemaking. (Id. at p. 3)
    DOE is not aware of any data showing the relationship between 
improved motor efficiency and FER ratings. DOE welcomes data exploring 
this relationship and may include efficiency levels corresponding to 
the use of more efficient BPM motors in a future analysis but did not 
include this additional efficiency level in the current analysis due to 
the lack of data.
c. Maximum Technology Efficiency Levels
    As part of DOE's analysis, the maximum available efficiency level 
is the highest efficiency unit currently available on the market. DOE 
also defines a ``max-tech'' efficiency level to represent the maximum 
possible efficiency for a given product. DOE identified the max-tech 
design for all consumer furnace fans product types as incorporating a 
BPM motor with a backward-inclined impeller.
    BPM motors are described in sections IV.B.1.a and IV.B.1.b of this 
chapter. For furnace fan models that use PSC motors, BPM motors can 
offer an improvement in efficiency and reduce FER. Backward-inclined 
impellers, in comparison to forward-inclined impellers used in the 
majority of furnace fans on the market, have been found to have a 
higher efficiency under certain operating conditions. In chapter 5 of 
the TSD accompanying the November 2022 Preliminary Analysis, DOE 
explained that it has tentatively used the same assumptions about the 
percent reduction in FER associated with implementing backward-inclined 
impellers as in the July 2014 Final Rule (i.e., a 10-percent reduction 
in FER compared to models that include forward-inclined impellers). 79 
FR 38130, 38159.
    In response to the November 2022 Preliminary Analysis, several 
commenters raised concerns about the assumption that a backward-
inclined impellers will reduce FER by 10 percent. Several commenters 
suggested that the impact of backward-inclined impellers on FER may 
vary by application. Carrier commented that DOE correctly concluded in 
the TSD that the efficiency improvement of a backward-inclined impeller 
is not uniform across the entire range of operation. Carrier stated 
that this lack of uniformity can require limiting the operating range, 
which reduces the furnace utility, or leads to unrealized efficiency 
improvements in application. Carrier stated that it believes backward-
inclined impellers are not a technologically feasible design option in 
some models because they do not improve efficiency and in other models 
they reduce furnace utility. Carrier stated that its non-weatherized 
95-percent-plus AFUE 14-inch-width gas furnaces use backward-inclined 
impellers to meet the current FER standards. (Carrier, No. 19 at pp. 3-
4) Carrier commented that it completed extensive research and evaluated 
the impact of this technology in many furnace variations and suggested 
that DOE's technology assessment does not fully account for the design 
challenges of using backward-inclined impellers in consumer furnaces. 
Carrier commented that the improvement in fan efficiency is not uniform 
across model sizes within a product family due to design changes needed 
to address the safety and reliability \9\ of the furnaces. Carrier 
requested that DOE continue its study of backward-inclined impeller 
technology to better understand the efficiency improvement variation 
across product sizes before concluding a uniform reduction in FER for a 
product class. Carrier also stated that because its models that 
incorporate backward-inclined impeller use the maximum technology 
design options, any reduction in the FER limit would eliminate them 
from the market. (Id. at pp. 1-3)
---------------------------------------------------------------------------

    \9\ Carrier's comments related to safety and reliability 
concerns are discussed in section IV.A.4.a of this document.
---------------------------------------------------------------------------

    AHRI commented that it is aware of products on the market which use 
proprietary backward-inclined impeller designs that are not capable of 
meeting the FER that DOE has associated with

[[Page 69841]]

that design option. AHRI further commented that these products are some 
of the highest-efficiency products on the market and stated that if the 
FER requirement is moved to a max-tech level, both furnace fan 
availability and high-efficiency furnace availability will be affected. 
(AHRI, No. 23 at pp. 5-6)
    The CA IOUs requested that DOE conduct additional research on 
backward-inclined fan performance to ensure the projected energy 
savings. The CA IOUs further requested that DOE collect current data on 
the performance of backward-inclined impellers in furnaces to compare 
with forward-curved fans available in 2023. The CA IOUs commented that 
DOE's calculations appeared to be based on research that may not 
reflect the current performance of forward-curved fans and instead 
overstates the performance of backward-inclined fans on the market. The 
CA IOUs commented that DOE's findings of 10-percent energy savings 
expected from backward-inclined fans were first presented in the 2014 
TSD and were based on 2003 GE testing of a single backward-inclined 
prototype against a single forward curved fan. The CA IOUs commented 
that a follow-up LBNL report found that the construction of the 
forward-curved fan tested in 2003 was substandard and contained large 
gaps between the impeller and housing and misalignment between the 
impeller and inlet. The CA IOUs pointed out that furnace fans in 2003 
had no performance requirements and that with the advent of furnace fan 
regulation, forward-curved fan design has improved while backward-
inclined fans currently available are not noticeably better than the 
prototype tested in 2003. The CA IOUs presented data showing the 
performance of one manufacturer's forward-curved and backward-inclined 
fans and commented that additional research is needed to confirm the 
efficiency difference before DOE considers using backward-inclined 
fans. (CA IOUs, No. 21 at pp. 2-5)
    Morrison stated that the GE fan referenced by DOE (as the basis of 
the backward inclined impeller analysis) was used in LBNL research and 
had limited benefit when compared to a forward-curved fan. Furthermore, 
Morrison commented that more information was needed regarding claims in 
the TSD that the use of EBM fans resulted in a 15-30-percent 
improvement. Morrison stated that DOE used an estimated 10-percent FER 
improvement from the 2014 rulemaking, but that would be relative to 
older designs made prior to changes seen in furnace fans since 2019. 
Morrison stated that consumer furnace fans have been improved since 
then to improve energy use. (Morrison, No. 27 at p. 2) No commenters 
submitted data supporting an alternative FER reduction value to 
associate with backward-inclined impellers. Therefore, DOE continued to 
rely on the best data available, which is what DOE used to arrive at 
the assumption that backward-inclined impellers uniformly reduce the 
FER of consumer furnace fans by a 10-percent reduction in the July 2014 
Final Rule. With respect to Morrison's comments that the furnace fan 
designs have changed since 2014, DOE notes that the estimate of a 10-
percent reduction is not relative to the baseline design, but instead 
is relative to an equivalent furnace fan with a forward curved impeller 
and thus still applies. In other words, in the July 2014 Final Rule, 
DOE estimated that implementing a backward-inclined impeller in place 
of a forward-inclined impeller would reduce FER by 10 percent in a 
furnace fan with a constant-airflow BPM motor and multi-staging; it was 
not relative to a baseline furnace with a PSC motor and single-stage 
operation. 79 FR 38130, 38159. (As previously discussed, for this 
analysis DOE did not find evidence of significant differentiation in 
FER among multi-stage models as compared to single-stage models, or 
between constant-airflow and constant-torque BPM motors.) However, the 
concerns and uncertainties raised by commenters in the above paragraphs 
contribute to DOE's tentative decision not to adopt standards at max-
tech levels for furnace fans at this time. For additional discussion 
regarding backward-inclined impellers, see section IV.H of this 
document.
    In response to DOE's consideration of backward-inclined impellers 
at the max-tech level in the November 2022 Preliminary Analysis, 
commenters discussed a number of concerns with implementing the 
technology.
    AHRI commented that there is no one-size-fits-all design for 
incorporating backward-inclined impellers into current products. AHRI 
stated that changes in the airflow design will require redesign and 
retesting on a model-by-model basis to ensure both proper operation and 
compliance with safety standards. (AHRI, No. 23 at p. 5) AHRI commented 
that the issues associated with moving from a forward-inclined impeller 
to a backward-inclined impeller will require safety testing and 
redesign. AHRI further commented that these additional costs are not 
accounted for in the analysis. (Id. at p. 3)
    Trane commented that, based on its research, a backward-inclined 
impeller is not compatible with current furnace dimensions, which are 
not large enough to accommodate a backward-inclined impeller. Trane 
added that it cannot be assumed that furnace design changes will have 
no impact on energy use and equipment utility when a backward-inclined 
impeller is used in the existing housing. Furthermore, Trane commented 
that, based on its research, the issues of the inlet cone design and 
clearances to the moving impeller remain a concern and require 
attention. (Trane, No. 22 at p. 2)
    Trane commented that adopting EL 1 would require replacing the 
current forward-inclined impeller with a backward-inclined impeller. 
Trane added that its research showed a 7-year development cycle for the 
blower system technology needed to adopt EL 1. Trane commented that 
this same research surfaced concerns with the ability to manufacture a 
high-speed (~1800 RPM max) blower wheel with close tolerances with the 
inlet cones, and significant leakage of high-pressure air from the 
exhaust portion of the housing back into the low-pressure input region 
if typical 0.25-in gaps are implemented. Trane commented that 
improvements from only retrofitting the impeller were less than 10 
percent unless blower housing modifications were made. Trane commented 
that its determination regarding the impellers was based on a study 
completed more than 20 years ago, ``Final Report for the Variable Speed 
Integrated Intelligent HVAC Blower, Final Report for BP-2'' (June 1, 
2003). (Trane, No. 22 at p. 2)
    Trane acknowledged that DOE's findings were based on the EBM-Papst 
furnace model, which has a backward-inclined impeller blower system. 
Trane commented that the EBM-Papst system is not an impeller change, 
but a different blower system that produces a different air flow 
pattern from the forward-inclined impeller and is thus not able to be 
tested according to the same standards as a furnace fan with a forward-
inclined impeller. Trane commented that for all manufacturers to adopt 
this system would require all safety, performance, and AFUE testing to 
be performed in order to put it into production, and furthermore, due 
to its need for an inlet orifice, this system limits the furnace's 
return air location to a single location (i.e., left side, right side, 
or bottom). Trane added that higher air flow furnaces often need more 
than a single side return to perform properly for CFM and watts, and 
therefore adopting the EBM-Papst approach would not be possible for 
many furnace fan manufacturers. Trane commented that, for the reasons 
stated

[[Page 69842]]

above and because it would reduce the utility of the furnace, the EBM-
Papst system is unsuitable as a basis for comparison for adopting EL 1 
among furnace fan manufacturers. (Id.) Furthermore, Trane commented 
that adapting all furnace fans to accommodate the EBM-Papst system 
would reduce the utility of the furnace and increase the installation 
time needed to move components to reach the return air location 
required by the system. Trane commented that the EBM-Papst system 
should have been analyzed as a separate EL level. (Trane, No. 22 at pp. 
2-3)
    Trane commented that testing would be required ahead of introducing 
the impeller change in order to determine the effects this difference 
would have on heat exchanger temperatures, furnace efficiency, and 
safety limit operation. Trane commented that according to DOE, housing 
design modifications were eliminated from consideration due to the 
resulting reduction in utility that such a change produces. Trane 
commented that the same logic should apply to an impeller change that 
creates a substantially different discharge velocity distribution. 
(Trane, No. 22 at p. 3)
    Lennox commented that the application of backward-inclined 
impellers would require changes in the housing design and airflow 
patterns that DOE has already screened out in the TSD. Lennox further 
commented that changes in the airflow design will require redesign and 
retesting on a model-by-model basis to ensure proper operation, 
compliance with safety standards, and product reliability. (Lennox, No. 
24 at p. 7)
    AHRI commented that backward-inclined impellers require a larger 
diameter than the forward-inclined impellers they are intended to 
replace, stating that backward-inclined impellers will not fit in the 
cabinet of a fan with a forward-inclined impeller. They further 
commented that most all models will have to be redesigned to 
accommodate the larger impeller, adding that it will lead to housing 
design and airflow path modifications. AHRI stated DOE has acknowledged 
that modifications of housing design and airflow path have an adverse 
impact on furnace efficiency. (AHRI, No. 23 at p. 3)
    AHRI commented that furnace cabinets are limited in size due to the 
dimensions of the installation space. AHRI stated that smaller-sized 
furnaces are at a disadvantage when it comes to meeting the required 
FER level because of the relationship between the furnace input level 
and the width of the furnace. AHRI commented that a change to the 
efficiency level to include backward-inclined impellers, coupled with 
the proposed future change to the minimum AFUE, would likely eliminate 
the smallest cabinet sizes from the marketplace without replacement 
furnace options or with reduced choices for consumers in cases where 
the smallest size model is required. (AHRI, No. 23 at p. 6)
    The CA IOUs suggested that DOE refrain from implementing energy 
conservation standards that would require the use of backward inclined 
fans, as the CA IOUs could not identify furnaces incorporating 
backward-inclined fans available for purchase. (CA IOUs, No. 21 at p. 
2)
    In response, as discussed previously and as several commenters 
acknowledge, DOE is aware of backward-inclined impellers being used in 
other sectors of the HVAC industry and also in a small number of 
consumer furnace fan models available today. Therefore, DOE has found 
this design option to be technologically feasible. DOE identified and 
examined the models that currently use backward inclined impellers and 
did not identify any significant differences in cabinet dimensions, 
overall construction, or any indication of installation constraints as 
compared to similar models using a forward-curved impeller. As a 
result, DOE maintained backward-inclined impellers as a design option 
at max-tech for this analysis. However, given the limited number of 
consumer furnace fan models that this technology is currently used in, 
DOE recognizes that there are some uncertainties with applying it to 
the entire consumer furnace fans market and across the entire range of 
capacities, as pointed out by several commenters. As discussed in 
section V.C of this document, DOE is proposing not to amend standards 
and therefore use of a backward inclined impeller would not be 
required. While this decision is primarily based on the cost 
effectiveness of this design option at this time, DOE has also 
considered some analytical uncertainties, as discussed in sections IV.H 
and V.C of this document.
d. Summary of Efficiency Levels Analyzed
    The efficiency levels and associated technologies analyzed for each 
class of consumer furnace fan are shown in Table IV.3 through Table 
IV.11.

          Table IV.3--Efficiency Levels and Technologies Used at Each Efficiency Level for NWG-NC Fans
----------------------------------------------------------------------------------------------------------------
                                                                          Description of       Percent reduction
                   EL                           FER equation          technologies typically      in FER from
                                                                           incorporated             baseline
----------------------------------------------------------------------------------------------------------------
0--Baseline............................  0.044 * QMax + 182.......  BPM Motor w/Forward-                     N/A
                                                                     Curved Impeller.
1--Max-tech............................  0.04 * QMax + 164........  BPM Motor w/Backward-                     10
                                                                     Inclined Impeller.
----------------------------------------------------------------------------------------------------------------


           Table IV.4--Efficiency Levels and Technologies Used at Each Efficiency Level for NWG-C Fans
----------------------------------------------------------------------------------------------------------------
                                                                          Description of       Percent reduction
                   EL                           FER equation          technologies typically      in FER from
                                                                           incorporated             baseline
----------------------------------------------------------------------------------------------------------------
0--Baseline............................  0.044 * QMax + 195.......  BPM Motor w/Forward-                     N/A
                                                                     Curved Impeller.
1--Max-tech............................  0.04 * QMax + 176........  BPM Motor w/Backward-                     10
                                                                     Inclined Impeller.
----------------------------------------------------------------------------------------------------------------


[[Page 69843]]


           Table IV.5--Efficiency Levels and Technologies Used at Each Efficiency Level for WG-NC Fans
----------------------------------------------------------------------------------------------------------------
                                                                          Description of       Percent reduction
                   EL                           FER equation          technologies typically      in FER from
                                                                           incorporated             baseline
----------------------------------------------------------------------------------------------------------------
0--Baseline............................  0.044 * QMax + 199.......  BPM Motor w/Forward-                     N/A
                                                                     Curved Impeller.
1--Max-tech............................  0.04 * QMax + 179........  BPM Motor w/Backward-                     10
                                                                     Inclined Impeller.
----------------------------------------------------------------------------------------------------------------


         Table IV.6--Efficiency Levels and Technologies Used at Each Efficiency Level for NWEF/NWMB Fans
----------------------------------------------------------------------------------------------------------------
                                                                          Description of       Percent reduction
                   EL                           FER equation          technologies typically      in FER from
                                                                           incorporated             baseline
----------------------------------------------------------------------------------------------------------------
0--Baseline............................  0.044 * QMax + 165.......  BPM Motor w/Forward-                     N/A
                                                                     Curved Impeller.
1--Max-tech............................  0.04 * QMax + 149........  BPM Motor w/Backward-                     10
                                                                     Inclined Impeller.
----------------------------------------------------------------------------------------------------------------


         Table IV.7--Efficiency Levels and Technologies Used at Each Efficiency Level for MH-EF/MB Fans
----------------------------------------------------------------------------------------------------------------
                                                                          Description of       Percent reduction
                   EL                           FER equation          technologies typically      in FER from
                                                                           incorporated             baseline
----------------------------------------------------------------------------------------------------------------
0--Baseline............................  0.044 * QMax + 101.......  BPM Motor w/Forward-                     N/A
                                                                     Curved Impeller.
1--Max--Tech...........................  0.04 * QMax + 91.........  BPM Motor w/Backward-                     10
                                                                     Inclined Impeller.
----------------------------------------------------------------------------------------------------------------


         Table IV.8--Efficiency Levels and Technologies Used at Each Efficiency Level for MH-NWG-NC Fans
----------------------------------------------------------------------------------------------------------------
                                                                          Description of       Percent reduction
                   EL                           FER equation          technologies typically      in FER from
                                                                           incorporated             baseline
----------------------------------------------------------------------------------------------------------------
0--Baseline............................  0.071 * QMax + 222.......  Improved PSC Motor.......                N/A
1......................................  0.044 * QMax + 137.......  BPM Motor w/Forward-                      39
                                                                     Curved Impeller.
2--Max-tech............................  0.04 * QMax + 123........  BPM Motor w/Backward-                     45
                                                                     Inclined Impeller.
----------------------------------------------------------------------------------------------------------------


         Table IV.9--Efficiency Levels and Technologies Used at Each Efficiency Level for MH-NWG-C Fans
----------------------------------------------------------------------------------------------------------------
                                                                          Description of       Percent reduction
                   EL                           FER equation          technologies typically      in FER from
                                                                           incorporated             baseline
----------------------------------------------------------------------------------------------------------------
0--Baseline............................  0.071 * QMax + 240.......  Improved PSC Motor.......                N/A
1......................................  0.044 * QMax + 148.......  BPM Motor w/Forward-                      39
                                                                     Curved Impeller.
2--Max-tech............................  0.04 * QMax + 133........  BPM Motor w/Backward-                     45
                                                                     Inclined Impeller.
----------------------------------------------------------------------------------------------------------------


          Table IV.10--Efficiency Levels and Technologies Used at Each Efficiency Level for NWO-NC Fans
----------------------------------------------------------------------------------------------------------------
                                                                          Description of       Percent reduction
                   EL                           FER equation          technologies typically      in FER from
                                                                           incorporated             baseline
----------------------------------------------------------------------------------------------------------------
0--Baseline............................  0.071 * QMax + 382.......  Improved PSC Motor.......                N/A
1......................................  0.044 * QMax + 236.......  BPM Motor w/Forward -                     39
                                                                     Curved Impeller.
2--Max-tech............................  0.04 * QMax + 212........  BPM Motor w/Backward-                     45
                                                                     Inclined Impeller.
----------------------------------------------------------------------------------------------------------------


          Table IV.11--Efficiency Levels and Technologies Used at Each Efficiency Level MH-NWO-NC Fans
----------------------------------------------------------------------------------------------------------------
                                                                          Description of       Percent reduction
                   EL                           FER equation          technologies typically      in FER from
                                                                           incorporated             baseline
----------------------------------------------------------------------------------------------------------------
0--Baseline............................  0.071 * QMax + 287.......  Improved PSC Motor.......                N/A
1......................................  0.044 * QMax + 176.......  BPM Motor w/Forward -                     39
                                                                     Curved Impeller.

[[Page 69844]]

 
2--Max-tech............................  0.04 * QMax + 158........  BPM Motor w/Backward-                     45
                                                                     Inclined Impeller.
----------------------------------------------------------------------------------------------------------------

2. Cost Analysis
    The cost analysis portion of the Engineering Analysis is conducted 
using one or a combination of cost approaches. The selection of cost 
approach depends on a suite of factors, including the availability and 
reliability of public information, characteristics of the regulated 
product and the availability and timeliness of purchasing the consumer 
furnace fans on the market. The cost approaches are summarized as 
follows:
     Physical teardowns: Under this approach, DOE physically 
dismantles a commercially available product, component-by-component, to 
develop a detailed bill of materials for the product.
     Catalog teardowns: In lieu of physically deconstructing a 
product, DOE identifies each component using parts diagrams (available 
from manufacturer websites or appliance repair websites, for example) 
to develop the bill of materials for the product.
     Price surveys: If neither a physical nor catalog teardown 
is feasible (for example, for tightly integrated products such as 
fluorescent lamps, which are infeasible to disassemble and for which 
parts diagrams are unavailable) or cost-prohibitive and otherwise 
impractical (e.g., large commercial boilers), DOE conducts price 
surveys using publicly available pricing data published on major online 
retailer websites and/or by soliciting prices from distributors and 
other commercial channels.
    In the present case, DOE conducted its cost analysis using a 
combination of physical and catalog teardowns to assess how 
manufacturing costs change with increased product efficiency. DOE 
estimated the MPC associated with each efficiency level to characterize 
the cost-efficiency relationship of improving consumer furnace fan 
performance. The MPC estimates are not for the entire HVAC product. 
Because consumer furnace fans are a component of the HVAC product in 
which they are integrated, the MPC estimates include costs only for the 
components of the HVAC product that impact FER.
    Products were selected for physical teardown analysis that have 
characteristics of typical products on the market at a representative 
input capacity of 80,000 Btu/h for the NWG-NC, NWG-C, WG-NC, NWEF/NWMB, 
MH-NWG-NC, MH-NWG-C, MH-EF/MB, and MH-WG product classes and 105,000 
Btu/h for the NWO-NC and MH-NWO product classes (determined based on 
market data and discussions with manufacturers). Selections spanned a 
range of FER efficiency levels and designs and included most 
manufacturers. The resulting bill of materials provides the basis for 
the manufacturer production cost (``MPC'') estimates.
    To account for manufacturers' non-production costs and profit 
margin, DOE applies a multiplier (the manufacturer markup) to the MPC. 
The resulting manufacturer selling price (``MSP'') is the price at 
which the manufacturer distributes a unit into commerce. DOE developed 
an average manufacturer markup by examining the annual Securities and 
Exchange Commission (``SEC'') 10-K reports filed by publicly-traded 
manufacturers primarily engaged in HVAC manufacturing and whose 
combined product range includes consumer furnace fans. DOE refined its 
understanding of manufacturer mark-ups by using information obtained 
during manufacturer interviews. The manufacturer mark-ups were used to 
convert the MPCs into MSPs. Further information on this analytical 
methodology is presented in the following subsections.
a. Teardown Analysis
    To assemble bills of materials (``BOMs'') and to calculate 
manufacturing costs for the different components in consumer furnace 
fans, multiple units were disassembled into their base components, and 
DOE estimated the materials, processes, and labor required to 
manufacture each individual component, a process referred to as a 
``physical teardown.'' Using the data gathered from the physical 
teardowns, each component was characterized according to its weight, 
dimensions, material, quantity, and the manufacturing processes used to 
fabricate and assemble it.
    For supplementary catalog teardowns, product data were gathered, 
such as dimensions, weight, and design features from publicly available 
information, such as manufacturer catalogs. Such ``virtual teardowns'' 
allowed DOE to estimate the major physical differences between a 
product that was physically disassembled and a similar product that was 
not. For this NOPD, data from a total of 61 physical and virtual 
teardowns of consumer furnace fans were used to calculate industry MPCs 
in the engineering analysis.
    The manufacturers of units chosen for teardowns have large market 
shares in the particular product classes for which their teardown units 
are categorized. Whenever possible, DOE examined multiple models from a 
given manufacturer that capture different design options and used them 
as direct points of comparison. DOE examined products with PSC, CT-BPM, 
and CA-BPM indoor blower motors, as well as products using single-
stage, two-stage, and modulating combustion systems. As further 
discussed in section IV.B.2.b of this document, cost values were 
developed for some of these technologies to estimate the manufacturing 
cost of changing designs from one technology to another (i.e., using a 
CA-BPM instead of a CT-BPM, or two-stage combustion instead of single-
stage combustion).
b. Cost Estimation Method
    The costs of individual models are estimated using the content of 
the BOMs (i.e., relating to materials, fabrication, labor, and all 
other aspects that make up a production facility) to generate MPCs. The 
resulting MPCs include costs such as overhead and depreciation, in 
addition to materials and labor costs. DOE collected information on 
labor rates, tooling costs, raw material prices, and other factors to 
use as inputs into the cost estimates. For purchased parts, DOE 
estimates the purchase price based on volume-variable price quotations 
and detailed discussions with manufacturers and component suppliers. 
Furnace fans are a component of HVAC products that include other 
products not associated with the cost and/or efficiency of the furnace 
fan. Therefore, DOE focused its engineering analysis on the components 
that comprise the furnace fan assembly, including:

[[Page 69845]]

     Fan motor and integrated controls (as applicable);
     HVAC product control board;
     Impeller;
     Single-staging or multi-staging components and controls;
     Fan housing; and
     Components used to direct or guide airflow.
    For parts fabricated in-house, the prices of the underlying ``raw'' 
metals (e.g., tube, sheet metal) are estimated on the basis of 5-year 
averages to smooth out spikes in demand. For purchased parts, DOE 
estimated the purchase prices paid to the OEMs of these parts, based on 
discussions with manufacturers during confidential interviews. Whenever 
possible, DOE obtained price quotes directly from the component 
suppliers used by furnace fan manufacturers whose products were 
examined in the engineering analysis. DOE determined that the 
components in Table IV.12 are generally purchased from outside 
suppliers.

              Table IV.12--Purchased Furnace Fan Components
------------------------------------------------------------------------
                                        Purchased sub-assemblies or
             Assembly                            components
------------------------------------------------------------------------
Fan Assembly.....................  Fan motor.
                                   Motor capacitor (when applicable).
                                   Impeller.
Controls.........................  PCB.
                                   Multi-Staging Components (when
                                    applicable).
------------------------------------------------------------------------

    Raw materials, such as plastic resins and insulation materials, are 
estimated on a current-market basis. The costs of raw materials are 
determined based on manufacturer interviews, quotes from suppliers, and 
secondary research. Past results are updated periodically and/or 
inflated to present-day prices using indices from resources such as 
MEPS Intl.,\10\ PolymerUpdate,\11\ the U.S. geologic survey 
(``USGS''),\12\ and the Bureau of Labor Statistics (``BLS'').\13\ To 
smooth out spikes in demand, these prices are estimated on the basis of 
5-year averages spanning from 2018 through 2022. Other ``raw'' 
materials such as plastic resins, insulation materials, etc. are 
estimated on a current-market basis. For non-metal raw material prices, 
DOE used prices based on current market data, rather than a 5-year 
average, because non-metal raw materials typically do not experience 
the same level of price volatility as metal raw materials.
---------------------------------------------------------------------------

    \10\ For more information on MEPS Intl, please visit 
www.mepsinternational.com/gb/en (Last accessed March 21, 2023).
    \11\ For more information on PolymerUpdate, please visit 
www.polymerupdate.com (Last accessed March 21, 2023).
    \12\ For more information on USGS metal price statistics, please 
visit www.usgs.gov/centers/national-minerals-information-center/commodity-statistics-and-information (Last accessed March 21, 2023).
    \13\ For more information on the BLS producer price indices, 
please visit www.bls.gov/ppi/ (Last accessed March 21, 2023).
---------------------------------------------------------------------------

    Certain factory parameters, such as fabrication rates, labor rates, 
and wages, also affect the cost of each unit produced. DOE factory 
parameter assumptions were based on internal expertise and manufacturer 
feedback. Table IV.13 lists the factory parameter assumptions used in 
the cost model for both high-volume and low-volume manufacturers. For 
the engineering analysis, these factory parameters, including 
production volume, are the same at every efficiency level. The 
production volume used at each efficiency level corresponds with the 
average production volume, per manufacturer. These assumptions are 
generalized to represent typical production and are not intended to 
model a specific factory. For the NWG-NC, NWG-C, WG-NC, NWEF/NWMB, MH-
NWG-NC, MH-NWG-C, and MH-EF/MB product classes, high production volume 
parameters were assumed due to these classes having generally high 
production volumes or using enough of the same major components as 
other high production volume classes. For NWO-NC and MH-NWO product 
classes, low production parameters were assumed.

               Table IV.13--Factory Parameter Assumptions
------------------------------------------------------------------------
                               High-volume furnace   Low-volume furnace
          Parameter               fan estimate          fan estimate
------------------------------------------------------------------------
Actual Annual Production      1,250,000...........  5,000.
 Volume (units/year).
Purchased Parts Volume......  500,000 units/year..  5,000 units/year.
Work Days Per Year (days)...  250.................  250.
Assembly Shifts Per Day       2...................  1.
 (shifts).
Fabrication Shifts Per Day    2...................  2.
 (shifts).
Fabrication Labor Wages ($/   16..................  16.
 h).
Assembly Labor Wages ($/h)..  16..................  16.
Length of Shift (hrs).......  8...................  8.
Average Equipment             10%.................  10%.
 Installation Cost (% of
 purchase price).
Fringe Benefits Ratio.......  50%.................  50%.
Indirect to Direct Labor      33%.................  33%.
 Ratio.
Average Scrap Recovery Value  30%.................  30%.
Worker Downtime.............  10%.................  10%.
Building Life (in years)....  25..................  25.
Burdened Assembly Labor Wage  24..................  24.
 ($/h).
Burdened Fabrication Labor    24..................  24.
 Wage ($/h).
Supervisor Span (workers/     25..................  25.
 supervisor).
Supervisor Wage Premium       30%.................  30%.
 (over fabrication and
 assembly wage).
------------------------------------------------------------------------

    In response to the November 2022 Preliminary Analysis, Morrison 
commented that labor costs and supervisory costs are not reflective of 
the current reality, adding that basic factory jobs pay well over $20/
hour.

[[Page 69846]]

Morrison commented that development, testing, and requalification costs 
need to be added. Morrison further commented that the costs from the 
engineering results are only for the fan components, adding that fan 
and housing changes will change heat exchanger performance/safety 
controls. (Morrison, No. 27 at p. 3)
    In response to the comments from Morrison, DOE notes that the 
factory parameters outlined in chapter 5 of the November 2022 
Preliminary Analysis TSD, including labor and supervisory costs, are 
developed based on manufacturer feedback. Available data indicates that 
the values provided in Table IV.13 are representative of the industry 
average, but DOE acknowledges that they may vary depending on a variety 
of factors. DOE welcomes additional feedback and data regarding these 
costs that would better reflect the current market. With respect to 
development, testing, and requalification costs, DOE notes that those 
costs are typically accounted for in the manufacturer impact analysis 
portion of DOE rulemakings. However, because DOE is not proposing to 
amend standards in this rulemaking, the manufacturer impact analysis 
was not conducted for this NOPD.
Constant Airflow BPM Blower Motor Cost Values
    As discussed in section IV.B.1.a of this document, for the NWG-NC, 
NWG-C, WG-NC, MWEF/NWMB, and MH-WF/MB product classes, the current 
baseline motor technology is a BPM motor, and specifically a CT-BPM 
motor. DOE's research suggests that the predominant BPM indoor blower 
motors sold on the market today are either a constant-torque or 
constant-airflow design. Both types of motors rely on electronic 
variable-speed motor systems that are typically mounted in an external 
chassis to the back of the motor. CA-BPM motors utilize feedback 
control to adjust torque based on ESP in order to maintain a desired 
airflow. This differentiates them from CT-BPM motors that will maintain 
torque and likely decrease airflow output in environments with high 
ESPs. Additionally, CA-BPM motors use feedback control to vary their 
output to maintain pre-programmed air flows. DOE has tentatively found 
that there are no significant differences in measured FER performance 
between furnace fans using CA-BPM and CT-BPM motors; however, CA-BPM 
motors are sometimes chosen for other benefits, such as increased 
consumer comfort. CA-BPM fan motors typically cost more than CT-BPM 
motors while not improving FER. Therefore, as discussed in section 
IV.B.1.a, DOE considered the baseline design to include CT-BPM motors 
for the NWG-NC, NWG-C, WG-NC, NWEF/NWMB, and MH-EF/MB classes. However, 
to better represent costs to consumers, DOE has developed cost values 
for CA-BPM that are applied in the LCC analysis to a portion of furnace 
fan installations.

           Table IV.14--Incremental Cost Adders for BPM Motors
------------------------------------------------------------------------
                                                        Incremental cost
                                                        increase for CT-
                    Product class                        BPM to CA-BPM
                                                            (2022$)
------------------------------------------------------------------------
NWG-C, NWG-NC, WG-NC, NWEF/NWMB, MH-NWG-NC, MH-NWG-C,             $28.07
 and MH-EF/MB........................................
NWO-NC, MH-NWO-NC....................................              83.67
------------------------------------------------------------------------

Multi-Stage Furnaces
    As discussed in section IV.A.2 of this document, DOE has identified 
a number of furnace fans in two-stage and modulating furnaces that are 
rated at the same relative FER as single-stage furnaces. DOE has 
tentatively determined consumers choose to purchase multi-stage 
products for the additional thermal comfort offered by furnaces with 
multiple stages of heating output. During teardowns, DOE examined 
multi-stage furnace designs to analyze the production cost differential 
for manufacturers to switch from single-stage to two-stage or 
modulating combustion. DOE determined a market-share weighted-average 
marginal cost increase of $21.07 for the NWG-C, NWG-NC, WG-NC, NWEF/
NWMB, MH-NWG-NC, MH-NWG-C, and MH-EF/MB classes to change a furnace 
from a single-stage to a two-stage design. DOE determined that oil 
units with multi-staging were rare and thus not representative of the 
market, so adders were not developed for the NWO-NC and MH-NWO-NC 
product classes. Where applicable, the additional cost to change to a 
two-stage furnace includes the added cost of a two-stage gas valve, 
two-speed inducer assembly, additional pressure switch, and additional 
controls and wiring. As with the blower motor costs discussed above, 
the additional cost of a multi-stage burner is accounted for in the LCC 
analysis based on the market penetration of such designs for furnaces.
Scaling to Alternative Input Capacities
    DOE also developed equations generate adders for scaling the MPC 
results at the representative capacity to the full range of input 
capacities available on the market for each motor type. DOE performed 
regression analyses on the discrete MPCs for each teardown and their 
respective input capacities--which spanned a range of capacities and 
airflows and encompassed a range of motor sizes--to generate an 
equation for each motor technology that reflects the relationship 
between these parameters. These parameters were derived separately for 
high-volume (NWGF-C, NWGH-NC, MH-NWGF-NC, MH-NWGF-C, and WGF-NC) and 
low-volume (NWOF-NC and MH-NWOF-NC) product classes These equations, 
which are presented in Table IV.15, are used in the LCC analysis (see 
section IV.E of this document) to analyze the impacts on furnace fans 
over the full range of input capacities. To estimate the MPC at a given 
input, first the appropriate adder is calculated using the equation and 
then the result added to or subtracted from (as applicable) the MPC at 
the representative input capacity.
    In the November 2022 Preliminary Analysis, DOE also estimated the 
relationship between consumer furnace fan cost and furnace fan motor 
airflow. However, DOE did not do so for this NOPD analysis because, 
upon reviewing market data, DOE found that scaling only by input 
capacity sufficiently represented the entire furnace fan market 
(including across the range of airflows) so it was unnecessary to also 
scale by airflow.

[[Page 69847]]



 Table IV.15--Equations for Scaling MPCs to Additional Input Capacities
------------------------------------------------------------------------
 Input capacity MPC adder equation: MPC adder = slope * (representative
               capacity (kBtu/h)--input capacity (kBtu/h))
-------------------------------------------------------------------------
                                     NWGF-C, NWGF-NC,
                                     MH-NWGF-NC, MH-    NWOF-NC and MH-
                                      NWGF-C, WGF-NC        NWOF-NC
------------------------------------------------------------------------
Motor Technology..................              Slope              Slope
PSC...............................             0.0650             0.7031
Constant-torque BPM...............             0.1395             0.6272
Constant-airflow BPM..............             0.1603             1.0069
------------------------------------------------------------------------

Backward-Inclined Impellers
    For the max-tech efficiency levels, DOE estimated the cost to 
manufacture a backward inclined impeller by using manufacturer feedback 
along with photographs and specifications found in research reports to 
determine cost model inputs to estimate the MPCs of the backward-
inclined impeller. These costs were scaled to different capacities by 
evaluating the impact of the backward-inclined impeller on the overall 
furnace system, depending on the average cabinet width at that 
capacity. DOE estimated the manufacturing cost of implementing a 
backward inclined impeller and compared it to the cost of using the 
forward inclined impellers that are ubiquitous in furnace fans 
currently on the market to develop ``adders'' for backward inclined 
impellers. The cost adder for backward-inclined impellers at each 
capacity were applied at the max-tech level to estimate the MPC and are 
outlined in Table IV.16 of this document.

              Table IV.16--Backward-Inclined Impeller Adder
------------------------------------------------------------------------
                                                       High       Low
              Input capacity (kBtu/h)                 volume     volume
                                                     (2022$)    (2022$)
------------------------------------------------------------------------
40................................................      28.60      34.15
60................................................      34.93      41.71
80................................................      37.21      44.43
100...............................................      55.18      65.89
120...............................................      59.09      70.56
------------------------------------------------------------------------

    In response to the November 2022 Preliminary Analysis, Morrison 
requested clarification on how DOE concluded that the additional MPC 
for a backward-inclined impeller would amount to $22.57. (Morrison, No. 
27 at p. 4) Morrison also recommended that DOE reevaluate the process 
by which it estimates the costs associated with designing and 
manufacturing a backward-inclined impeller. Morrison commented that a 
full evaluation of design, tools, and process would be needed to assess 
if the technology can meet the expected volume. Morrison recommended 
that DOE's analysis consider cost increases for the following: (1) 
necessary housing improvements required to realize potential backward-
inclined impeller value; (2) increased strength for motor/fan assembly 
mounting hardware, which will ensure tighter gaps between inlet and 
impeller and support of the larger impeller; (3) the equipment changes 
required to accommodate heat exchanger redesign or safety testing/
requalification; and (4) factory parameters. Morrison commented that 
certain installation considerations should be addressed, including: (1) 
the need for shipping brackets or added stiffening to account for the 
larger impeller and (2) the need for tighter clearances between 
impeller and housing to avoid damage during handling. (Morrison, No. 27 
at pp. 3, 4)
    AHRI commented that backward-inclined impellers are often larger 
than comparable forward-inclined impellers, have increased sensitivity 
to ESP, and require more sophisticated controls, which will affect the 
overall energy use of the product. (AHRI, No. 23 at p. 6) AHRI stated 
that the addition of complex controls was not included in DOE's cost 
analysis, which skews the economic analysis. (AHRI, No. 23 at p. 3)
    Trane added that the cost of incorporating the full EBM-Papst 
system was not included in the TSD as it is not just a matter of 
replacing the impeller.) Trane commented the TSD assumed that only the 
impeller was changed and the cost estimate ignored the need for inlet 
cones with close tolerances. Trane commented that those estimates would 
be difficult to confirm because the design still needs to be developed. 
Trane commented that, as published, the TSD cost estimates and energy 
savings showed 44 to 48 percent of NWG furnace consumers negatively 
affected and when the full cost of the change is included, Trane 
believed these results will be found to be understated. (Trane, No. 22 
at pp. 2-3)
    Lennox commented that the cost and labor required for installing 
backward-inclined impellers in current furnace designs are not fully 
accounted for in the TSD. Lennox commented that backward-inclined 
impellers are a nascent technology that requires a larger diameter or 
higher rotational speed than a centrifugal forward-curved impeller, 
adding that backward-inclined impellers are more sensitive to changes 
in ESP and likely require motors with extended RPM range and controls. 
Lennox further commented that installing a backward-inclined impeller 
would require significant furnace redesign that includes modifications 
in housing design and airflow path, both of which DOE has acknowledged 
adversely impact furnace efficiency. Lennox commented that the study 
DOE cites in the TSD (i.e., Wegman, Herman 2003 HVAC Blower Report) was 
conducted prior to when residential furnace designs became more compact 
in height to accommodate larger evaporator coil designs required to 
meet increased DOE conservation standards, and that DOE should take 
into account the redesign, safety testing, and other costs placed upon 
the consumer before considering implementing the proposed changes. 
(Lennox, No. 24 at p. 3)
    In response, DOE clarifies that the MPC estimate for backward-
inclined impellers from the November 2022 Preliminary Analysis was 
based on a prototype used in research performed by General Electric and 
testing performed at national laboratories.\14\ However, for this 
rulemaking, DOE has incorporated manufacturer feedback and new market 
data to update its MPC estimates for backward-inclined impellers, as

[[Page 69848]]

reported in Tables IV.17--IV.19 of this document. These costs have been 
updated to reflect costs to the full furnace system beyond replacing 
the impeller component (including advanced controls, changes to the 
airflow path, etc.), but DOE acknowledges that given the current 
limited use of this technology in consumer furnace fans there is still 
uncertainty in how the technology would be applied over the full range 
of products currently available.
---------------------------------------------------------------------------

    \14\ The backward-inclined impeller prototype used for these 
estimates is detailed in a report titled California's Secret Energy 
Surplus: The Potential for Energy Efficiency. (Available at: 
search.issuelab.org/resource/california-s-secret-energy-surplus-the-potential-for-energy-efficiency.html) (Last accessed June 7, 2023).
---------------------------------------------------------------------------

    DOE did not extend the analysis to account for changes in 
tolerances and redesign of the heat exchanger and other furnace 
systems. In manufacturer interviews, some manufacturers noted that 
airflow changes associated with backward-inclined impellers could 
require a different approach to heat exchanger designs. These changes 
could necessitate large conversion costs as manufacturing to tight 
tolerances and introducing new heat exchanger designs are capital 
intensive endeavors. DOE recognizes the potential need for upfront 
capital investments and product conversion costs in addition the 
estimated changes in MPC, as discussed in section IV.H of this 
document.
3. Cost-Efficiency Results
    The final results of the FER engineering analysis are the MPCs for 
each furnace fan product class analyzed at each efficiency level (and 
associated design option), resulting in a cost-efficiency relationship. 
The cost-efficiency results are shown in tabular form in Table IV.17 
through Table IV.19 in the form of efficiency versus MPC. 
(QMax is the airflow, in cfm, at the maximum airflow-control 
setting measured during the proposed DOE test procedure.) As described 
in section IV.B.2.b of this document, the MPC presented is not for the 
entire HVAC product because furnace fans are a component of the HVAC 
product in which they are integrated.
    As discussed in section IV.B.2.b of this document, separate cost 
values were developed for constant-airflow BPM motors and multi-staging 
because these premium design elements could add comfort or provide 
other benefits but were not incorporated as design options into 
efficiency levels for furnace fans used in this analysis.
    DOE used the cost-efficiency curves from the engineering analysis 
as an input to the LCC analysis to determine the added price of the 
more efficient furnace fan components in HVAC equipment sold to the 
customer (see section IV.E of this document).

      Table IV.17--Cost Efficiency Results by Product Class--NWG-NC, NWG-C, WGF-NC, NWEF/NWMB, and MH-EF/MB
----------------------------------------------------------------------------------------------------------------
                                                                      Efficiency level
                                          ----------------------------------------------------------------------
                                                                       Design option
                                          ----------------------------------------------------------------------
                                                     Baseline                              EL 1
                                          ----------------------------------------------------------------------
                                                     BPM motor            BPM motor + backward-inclined impeller
----------------------------------------------------------------------------------------------------------------
MPC......................................  $108.06.....................  $136.13.
                                          ----------------------------------------------------------------------
Product Class............................                      Maximum Allowable FER Equation
                                          ----------------------------------------------------------------------
NWG-NC...................................  0.044 * QMax + 182..........  0.04 * QMax + 164.
NWG-C....................................  0.044 * QMax + 195..........  0.04 * QMax + 176.
WG-NC....................................  0.044 * QMax + 199..........  0.04 * QMax + 179.
NWEF/NWMB................................  0.044 * QMax + 165..........  0.04 * QMax + 149.
MH-EF-MB.................................  0.044 * QMax + 101..........  0.04 * QMax + 91.
----------------------------------------------------------------------------------------------------------------


                  Table IV.18--Cost Efficiency Results by Product Class--MH-NWG-NC and MH-NWG-C
----------------------------------------------------------------------------------------------------------------
                                                                  Efficiency level
                                   -----------------------------------------------------------------------------
                                                                    Design option
                                   -----------------------------------------------------------------------------
                                           Baseline                EL 1                        EL 2
                                   -----------------------------------------------------------------------------
                                                                                  BPM motor + backward-inclined
                                         Improved PSC            BPM motor                   impeller
----------------------------------------------------------------------------------------------------------------
MPC...............................  $82.39...............  $108.06.............  $136.13.
                                   -----------------------------------------------------------------------------
Product Class.....................                         Maximum Allowable FER Equation
                                   -----------------------------------------------------------------------------
MH-NWG-NC.........................  0.071 * QMax + 222...  0.044 * QMax + 137..  0.04 * QMax + 123.
MH-NWG-C..........................  0.071 * QMax + 240...  0.044 * QMax + 148..  0.04 * QMax + 133.
----------------------------------------------------------------------------------------------------------------


[[Page 69849]]


                   Table IV.19--Cost Efficiency Results by Product Class--NWO-NC and MH-NWO-NC
----------------------------------------------------------------------------------------------------------------
                                                                  Efficiency level
                                   -----------------------------------------------------------------------------
                                                                    Design option
                                   -----------------------------------------------------------------------------
                                           Baseline                EL 1                        EL 2
                                   -----------------------------------------------------------------------------
                                                                                  BPM motor + backward-inclined
                                         Improved PSC            BPM motor                   impeller
----------------------------------------------------------------------------------------------------------------
MPC...............................  $195.61..............  $216.95.............  $300.62.
                                   -----------------------------------------------------------------------------
Product Class.....................                         Maximum Allowable FER Equation
                                   -----------------------------------------------------------------------------
NWO-NC............................  0.071 * QMax + 382...  0.044 * QMax + 236..  0.04 * QMax + 212.
MH-NWO-NC.........................  0.071 * QMax + 287...  0.044 * QMax + 176..  0.04 * QMax + 158.
----------------------------------------------------------------------------------------------------------------

    In response to the November 2022 Preliminary Analysis, Morrison 
commented that the average consumer purchase price increase of $46-47 
that DOE projects for consumer fans operating at EL 1 appears to be 
understated, considering the changes and variances in motor costs 
depending on whether production occurs in the United States or abroad. 
Morrison requested clarification on how DOE arrived at that estimate. 
Morrison commented that certain installation considerations should be 
addressed, including: (1) the need for shipping brackets or added 
stiffening to account for the larger impeller and (2) the need for 
tighter clearances between impeller and housing to avoid damage during 
handling. (Morrison, No. 27 at p. 4)
    In response, DOE notes that the analysis to develop MPCs for each 
efficiency level includes physical and virtual product teardowns of 
units that incorporate the technology options associated with that 
level. Specific motor costs are estimated using cost estimates obtained 
through manufacturer feedback, including impacts from production 
location and volume. The costs for these teardowns are then weighted 
based on several factors, including manufacturer market share and motor 
horsepower market share. By using the weighted average of these 
teardown costs, DOE develops an MPC that is representative of the 
market and takes into account the variation in the market.
    Nidec commented during the public meeting that the motor prices for 
the preliminary analysis indicated a dramatic increase from a baseline 
PSC to an improved PSC when compared to a BPM motor. Nidec commented 
that the November 2022 Preliminary Analysis reported a baseline PSC 
cost of around $65, an ECM cost of $100, and an improved PSC cost of 
$116. Nidec commented that estimates showed a 90 percent increase in 
cost for the improved PSC versus the BPM. (Nidec, Public Meeting 
Transcript, No. 26 at pp. 19-20)
    In response, DOE notes that the $65.73 cost reported in the 
November 2022 Preliminary Analysis reflects the MPC for a furnace fan 
using an improved PSC motor in the NWGF-C, NWGF-NC, MH-NWGF-NC, MH-
NWGF-C, WGF-NC and NWEF/NWMB product classes, and does not reflect a 
baseline PSC motor cost. In the November 2022 Preliminary Analysis, DOE 
estimated that the MPC for a furnace fan using an improved PSC motor in 
the NWOF-NC and MH-NWOF-NC product classes was $116.25. Therefore, the 
difference between these two costs does not reflect the incremental 
cost to transition from a baseline PSC motor to an improved PSC motor, 
but instead reflects the difference in cost of an improved PSC motor 
for the different product classes. This difference is largely due to 
the different production volumes assumed for the classes, as outlined 
in section IV.B.2 of this document.

C. Markups Analysis

    The markups analysis develops appropriate markups (e.g., retailer 
markups, distributor markups, contractor markups) in the distribution 
chain and sales taxes to convert the MSP estimates derived in the 
engineering analysis to consumer prices, which are then used in the LCC 
and PBP analysis. At each step in the distribution channel, companies 
mark up the price of the product to cover business costs and profit 
margin. Before developing markups, DOE defines key market participants 
and identifies distribution channels.
    DOE used the same distribution channels for furnace fans as it used 
for furnaces in the recent energy conservation standards rulemaking for 
those products. DOE believes that this is an appropriate approach 
because the vast majority of the furnace fans covered in this 
rulemaking are a component of a furnace. DOE has concluded that there 
is insufficient evidence of a replacement market for furnace fans to 
establish a separate distribution channel on that basis.
    DOE developed baseline and incremental markups for each actor in 
the distribution chain. Baseline markups are applied to the price of 
products with baseline efficiency, while incremental markups are 
applied to the difference in price between baseline and higher-
efficiency models (the incremental cost increase). The incremental 
markup is typically less than the baseline markup and is designed to 
maintain similar per-unit operating profit before and after new or 
amended standards.\15\
---------------------------------------------------------------------------

    \15\ Because the projected price of standards-compliant products 
is typically higher than the price of baseline products, using the 
same markup for the incremental cost and the baseline cost would 
result in higher per-unit operating profit. While such an outcome is 
possible, DOE maintains that in markets that are reasonably 
competitive it is unlikely that standards would lead to a 
sustainable increase in profitability in the long run.
---------------------------------------------------------------------------

    To estimate average baseline and incremental mark-ups, DOE relied 
on several sources, including: (1) the HARDI 2013 Profit Report (i.e., 
for wholesalers); and (2) U.S. Census Bureau 2017 Economic Census data 
on the residential and commercial building construction industry (i.e., 
for general contractors, mechanical contractors, and mobile home 
manufacturers). In addition, DOE used the 2005 Air Conditioning 
Contractors of America's (``ACCA'') Financial Analysis on the Heating, 
Ventilation, Air-Conditioning, and Refrigeration contracting industry 
to disaggregate the mechanical contractor mark-ups into replacement and 
new construction markets. DOE also used various sources for the 
derivation of the mobile home dealer mark-ups (see chapter 6 of the PA 
TSD).
    DOE derived state and local taxes from data provided by the Sales 
Tax

[[Page 69850]]

Clearinghouse.\16\ These data represent weighted averages that include 
county and city rates. DOE applied the state sales taxes to match the 
state-level markups for wholesalers and mechanical and general 
contractors.
---------------------------------------------------------------------------

    \16\ Sales Tax Clearinghouse Inc., State Sales Tax Rates Along 
with Combined Average City and County Rates (Jan. 4, 2023). 
(Available at www.thestc.com/STrates.stm) (Last accessed Jun. 1, 
2023).
---------------------------------------------------------------------------

    Chapter 6 of the PA TSD provides details on DOE's development of 
markups for consumer furnace fans.
    Lennox recommended that DOE review the lower incremental markups 
for increased consumer furnace fan standard levels considered in the 
TSD. Lennox stated that Table ES.3.10 from the TSD shows a 
significantly discounted incremental markup from the baseline markup, 
which is not logical or aligned with business practices. Lennox 
commented that it does not believe an increased standard level would 
result in a lower markup for minimum efficiency products from the 
current base levels. Lennox recommended that a consistent markup level 
be applied instead of discounted incremental markups. (Lennox, No. 24 
at p. 7-8)
    DOE's incremental markup approach assumes that an increase in 
profitability, which is implied by keeping a fixed markup when the 
product price goes up, is unlikely to be viable over time in reasonably 
competitive markets. DOE recognizes that actors in the distribution 
chains are likely to seek to maintain the same markup on appliances in 
response to changes in manufacturer sales prices after an amendment to 
energy conservation standards. However, DOE believes that retail 
pricing is likely to adjust over time as those actors are forces to 
readjust their markups to reach a medium-term equilibrium in which per-
unit profit is relatively unchanged before and after standards are 
implemented.
    DOE acknowledges that markup practices in response to amended 
standards are complex and vary across business conditions. However, 
DOE's analysis necessarily only considers changes in appliance 
offerings that occur in response to amended standards. DOE continues to 
maintain that its assumption that standards do not facilitate a 
sustainable increase in profitability is reasonable.

D. Energy Use Analysis

    The purpose of the energy use analysis is to determine the annual 
energy consumption of consumer furnace fans at different efficiencies 
in representative U.S. single-family homes, multi-family residences, 
and commercial buildings, and to assess the energy savings potential of 
increased consumer furnace fan efficiency. The energy use analysis 
estimates the range of energy use of consumer furnace fans in the field 
(i.e., as they are actually used by consumers). The energy use analysis 
provides the basis for other analyses DOE performed, particularly 
assessments of the energy savings and the savings in consumer operating 
costs that could result from adoption of amended or new standards.
    To establish a reasonable range of energy consumption for consumer 
furnace fans, DOE primarily used data from the U.S. Energy Information 
Administration's (EIA's) most recent 2015 Residential Energy 
Consumption Survey (RECS 2015). RECS 2015 is a national sample survey 
of housing units that collects statistical information on the 
consumption of and expenditures for energy in housing units, along with 
data on energy-related characteristics of the housing units and 
occupants. RECS 2015 has a sample size of 5,686 housing units and was 
constructed by EIA to be a national representation of the household 
population in the United States. DOE also considered the use of 
consumer furnace fans in commercial applications, based on 
characteristics from EIA's most recent 2012 Commercial Building Energy 
Consumption Survey (CBECS 2012) for a subset of building types that use 
consumer furnace fans covered by a potential standard. DOE utilized 
additional data sources to refine the development of a representative 
population of buildings for each furnace fan product class, as detailed 
in chapter 7 of the PA TSD.
    In calculating the energy consumption of furnace fans, DOE adjusted 
the energy use from RECS 2015 and CBECS 2012 to normalize for weather. 
This was accomplished by adjusting the RECS 2015 household and CBECS 
2012 building energy consumption values based on 10-year average 
heating degree-day (HDD) and average cooling degree-day (CDD) data for 
each geographical region. DOE also accounted for the change in building 
shell characteristics by applying the building shell efficiency index 
and projected trend in the HDD and CDD in EIA's Annual Energy Outlook 
2023.
    DOE's analysis takes into account ACCA Manuals J, S, and D methods 
to size every household and building in the sample. DOE first uses 
Manual J to estimate the house or building design heating load in order 
to determine the blower requirements for the assigned heating and 
cooling equipment. DOE's analysis considers that typically the furnace 
fan is sized based on the maximum cooling capacity required. The 
heating and cooling furnace fan speed setting is then varied to match 
the recommended/required airflow performance and takes into account 
differences in the ductwork system curve in the field.
    Chapter 7 of the PA TSD provides details on DOE's energy use 
analysis for consumer furnace fans.
    WM technologies requested information regarding DOE's use of RECS 
data and stated that RECS has stated that the 2015 imputation rates 
have a variability of 65.6 percent. (WM Technologies, No. 26 at pp. 31-
32)
    In response, DOE notes that EIA administers the RECS to a 
nationally representative sample of U.S. housing units. For RECS 2015, 
specially trained interviewers collected energy characteristics on the 
housing unit, usage patterns, and household demographics. This 
information is combined with data from energy suppliers to these homes 
to estimate energy costs and usage for heating, cooling, appliances, 
and other end uses. The RECS survey data, including energy use, is an 
integral ingredient of EIA's Annual Energy Outlook (AEO) and Monthly 
Energy Review (MER). EIA's methodology for RECS 2015 is described in 
multiple reports.\17\ As described in these reports, RECS 2015 
represents a substantial update to the end-use modeling and calibration 
methods. For example, in the 2015 RECS, the end-use models follow an 
engineering approach, and the calibration--which follows a minimum 
variance estimation approach--is based on the relative uncertainties of 
and correlations between the end uses being estimated. Instead of 
estimating unknown parameters and interpreting their solution values as 
in statistical modeling, engineering models improve upon statistical 
models by drawing on existing studies. Also, engineering models lead to 
more realistic variations across modeled housing units. In addition, 
calibration procedures in RECS 2015 use minimum variance estimation, 
which better incorporates household characteristics data uncertainty 
and recognizes correlations between end uses. DOE notes that households 
that use natural gas, propane, or fuel oil predominantly use these 
fuels for space heating and water heating. In the case of space 
heating, it is heavily seasonal, while water heating

[[Page 69851]]

remains more constant throughout the year.
---------------------------------------------------------------------------

    \17\ See www.eia.gov/consumption/residential/data/2015/index.php?view=methodology (Last accessed Jan. 3, 2023).
---------------------------------------------------------------------------

    For the furnace fan energy use analysis, DOE primarily used the 
RECS 2015 sample to derive the heating and cooling loads to estimate 
furnace fan operating hours in the cooling and heating mode. DOE also 
notes that the variables used from RECS 2015 that are used for the 
furnace fan analysis have low imputation rates. DOE determined the 95-
percent confidence level for the overall average heating and cooling 
energy use values used in its analysis for consumer furnace fans to be 
plus or minus 2.7 percent, using EIA's methodology for calculating 
sampling error.\18\ DOE also compared the RECS 2015 energy consumption 
estimates for furnaces to previous RECS energy consumption estimates 
and other available studies, and the Department found that energy 
consumption values estimated in 2015 are similar (or within in the RECS 
2015 sampling error) of those other sources, after being adjusted for 
heating degree-day differences, building shell changes in the stock, 
and average furnace efficiency in the stock. This analysis included 
comparing homes using consumer furnaces by home sizes and type in the 
different studies, including larger sample sized studies at the 
national level such as the 2021 American Community Survey (ACS),\19\ 
the 2021 American Housing Survey (AHS),\20\ the 2022 American Home 
Comfort Study,\21\ as well as regional studies such as the 2016-2017 
Residential Building Stock Assessment (RBSA) for the northwest region 
(Idaho, Montana, Oregon, and Washington),\22\ the 2019 Residential 
Building Stock Assessment for the State of New York,\23\ the 
Massachusetts Residential Baseline Study,\24\ and the 2019 California 
Residential Appliance Saturation Study (RASS).\25\ In conclusion, DOE 
finds that RECS 2015 matches other studies' energy use estimates for 
furnace and is a reliable source for DOE to use to create a 
representative national sample reflecting variations in real world 
energy use. See appendix 7A and 7B of the PA TSD for more details.
---------------------------------------------------------------------------

    \18\ See www.eia.gov/consumption/residential/data/2015/pdf/microdata_v3.pdf (Last accessed Jan. 3, 2023).
    \19\ U.S. Census Bureau, 2021 American Community Survey 
(Available at: www.census.gov/programs-surveys/acs) (Last accessed 
Jan. 3, 2023).
    \20\ Department of Housing and Urban Development (HUD) and U.S. 
Census Bureau, 2021 American Housing Survey (Available at: 
www.census.gov/programs-surveys/ahs.html) (Last accessed Jan. 3, 
2023).
    \21\ Decision Analyst, 2022 American Home Comfort Study 
(Available at: www.decisionanalyst.com/syndicated/homecomfort/) 
(Last accessed Jan. 3, 2023).
    \22\ NEEA, 2016-2017 Residential Building Stock Assessment 
(Individua Reports for Single Family, Manufactured Homes and 
Multifamily Homes) (Available at: neea.org/data/residential-building-stock-assessment) (Last accessed Jan. 3, 2023).
    \23\ NYSERDA, 2019 Residential Building Stock Assessment 
(Available at: www.nyserda.ny.gov/About/Publications/Building-Stock-and-Potential-Studies/Residential-Building-Stock-Assessment) (Last 
accessed Jan. 3, 2023).
    \24\ Electric and Gas Program Administrators of Massachusetts, 
Massachusetts Residential Building Use and Equipment 
Characterization Study (Available at: ma-eeac.org/wp-content/uploads/Residential-Building-Use-and-Equipment-Characterization-Study-Comprehensive-Report-2022-03-01.pdf) (Last accessed Jan. 3, 
2023).
    \25\ CEC, 2019 California Residential Appliance Saturation Study 
(Available at: www.energy.ca.gov/publications/2021/2019-california-residential-appliance-saturation-study-rass) (Last accessed Jan. 3, 
2023).
---------------------------------------------------------------------------

    Morrison commented that DOE noted the CBECS 2012 and RECS 2015 
values for HDD and CDD to be different for the same location, and 
requested further details that would clarify how the same location can 
have different heating and cooling loads for residential furnaces. 
(Morrison, No. 27 at p. 6) In response, DOE notes that in the PA TSD 
Table 7E.3.1 shows the HDD for each of the 360 weather stations in the 
NOAA data set that DOE used for mapping to RECS 2015 and CBECS 2012 
individual sampled housing units and buildings. The columns labeled 
RECS 2015 shows CDD and HDD for 2015 that would then be comparable to 
the HDD/CDD data provided by EIA in the RECS 2015 sample. Similarly, 
the columns labeled CBECS 2012 shows CDD and HDD for 2012 that would 
then be comparable to the HDD/CDD data provided by EIA in the CBECS 
2012 sample.
    Morrison requested further insight and verification of DOE's claim 
that the electric motor's power is ``taken into account by increasing 
the heating load, decreasing the cooling load or both for more 
efficient furnace fans.'' (Morrison, No. 27 at p. 3) In addition, 
Morrison requested clarification on how DOE calculated circulation mode 
power and how it accounts for the varying levels of beneficial (for 
heating) and detrimental (for cooling) power use in the circulating-
only mode. Morrison commented that since there is rarely no demand for 
either, the split would be about 50/50--half the time the power usage 
will be beneficial and half the time detrimental for the household. 
(Morrison, No. 27 at p. 4)
    DOE clarifies that the energy use analysis takes into account that 
heat is being transferred from the furnace fan motor to the airflow in 
the ductwork. Since higher efficiency furnace fan design options 
improve motor efficiency, less heat is released into the ductwork for 
higher efficiency designs. The heat provided by the motor reduces the 
heating load and increases the cooling load that the furnace needs to 
meet. Therefore, the heat load is increased, while cooling load is 
decreased for higher efficiency designs furnace fan options. For 
example, for NWOFs the average fuel energy use for going from EL 0 to 
EL 1 is increased by about 1 MMBtu/yr on average (or 1.6%), while the 
fuel energy use from going from EL 1 to EL 2 is increased by 0.2 MMBtu/
y (or about 0.3%). DOE also took into account the beneficial (for 
heating) and detrimental (for cooling) power use in the circulating-
only mode by estimating the monthly energy use for circulating-only 
mode and separating the months into heating, cooling, or shoulder 
months for each sampled household.
    Morrison requested clarification on some of the equations and 
variables that DOE utilized in the TSD. Specifically, Morrison 
commented on the following: (1) it is not possible to reconcile 
equations 7.3, 7.4, and 7.5, because the same coefficients are used to 
set up the incongruent state of cfm = watts/cfm; and (2) DOE's use of 
the pressure variable in place of the more typical cfm variable when 
assessing curves, considering that a reduction in flow--when not 
required--will reduce fan energy consumption and a reduction of only 3 
percent in flow will be equal to 10 percent in energy savings. 
(Morrison, No. 27 at p. 3-4) As explained in chapter 7 and appendix 7B-
D of the PA TSD, the performance curves of CFM vs. pressure (equation 
7.3) and watts per cfm (equation 7.5) are combined in the fan power 
curve equation (equation 7.4) to produce the wattage usage at the 
operating point.
    Morrison commented that it identified inconsistencies regarding 
DOE's assumptions about consumer use and need. Morrison recommended 
that DOE take into account the use of furnaces by some consumers as a 
backup to heat pumps and therefore a secondary heat source. Morrison 
further noted that, in Table 7A.2.1 and Table 7A.2.2 in the PA TSD, 
Morrison identified an inconsistent relationship in the data from RECS 
2015 showing reported replacements for various product classes; 
Morrison requested clarification on this uneven relationship between 
shipment numbers and numbers of households. (Morrison, No. 27 at p. 5) 
In response, DOE takes into account gas-fired furnaces used for backup 
to heat pumps as well as furnaces used as secondary equipment in its 
analysis. The sample for consumer furnace fans

[[Page 69852]]

includes those used in secondary units. Multiple factors could impact 
the difference between shipments and the available stock, including 
equipment switching (in the no-new standards case), changes in new 
construction saturations and growth in different regions due to 
demographic shifts, differences in lifetime, etc. Therefore, DOE relies 
on the historical shipments data that it deems most correctly reflects 
future shipments in 2030 and beyond.
    Morrison commented that DOE shows the test procedure for cooling as 
having pressures ranging from 0.1 to 0.2 w.c. for conventional split 
systems and noted that this reference is from an old test method; the 
new test method effective in 2023 has higher pressures (M1 vs M). 
(Morrison, No. 27 at p. 5) DOE acknowledges that the new test procedure 
should have been referenced in the previous PA TSD. The values in the 
TSD from the old test procedure were provided for reference only and 
are not directly used in the analysis.
    Morrison stated that appendix 7C of the PA TSD (Calculation of 
Furnace Blower Fan Energy Consumption), begins with an incorrect 
statement by DOE that ``The efficiency consumption (and overall 
efficiency) of a blower motor depends on the speed at which the motor 
operates, the external static pressure difference across the blower, 
and the airflow through the blower.'' Morrison commented that 
electrical consumption depends on the design of the furnace, the fan, 
and the motor in combination with the ductwork present and all are 
important to the FER result. (Morrison, No. 27 at p. 5) DOE agrees that 
the efficiency of the furnace fan will depend on the design of the 
furnace, the design of the furnace and motor, in combination with the 
ductwork. DOE's analysis is built around the selected design options 
and current furnace designs that from the engineering analysis provide 
the efficiency and energy use characteristics by design option. Once 
these design options are fixed the energy consumption depends on the 
intersection between the furnace fan performance curves and the 
ductwork present.
    Morrison commented that all discussion in appendix 7C of the PA TSD 
misses the point and purpose of the furnace operation and added that 
Figure 7C.1.1 (Power Determination) uses pressure as the x-axis 
independent variable, but the relevant independent variable is the 
volume flow rate with the assumption of a relatively fixed air density. 
Morrison commented that performance tables in furnace literature use 
pressure as the variable, stating that this is the easy method of 
operational determination for installers in the field--but not an 
appropriate way to conduct a technical analysis of consumer furnace 
fans. Morrison further commented that 7C.1 contains an error: air power 
is not proportional to air speed but rather volume rate of airflow. 
(Morrison, No. 27 at p. 6) Morrison also commented that, in section 7C-
4 of the PA TSD, the method of analysis is confusing and the first two 
assumptions listed on 7C-4 are incorrect: (1) Regarding the assumption 
that slope of airflow and watts/cfm does not vary within the same motor 
technology, Morrison commented that performance curves for furnace fans 
will have varying slope dependent on the fan, motor and furnace system 
for the same motor technology, and that some small range changes could 
appear to have the same slope but the entirety of the performance range 
of interest will have variation; (2) Regarding the assumption that BPM 
(constant airflow) and PSC with controls always maintain the same 
airflow, Morrison commented that BPM (constant airflow) will closely 
maintain the airflow rate until the maximum power of the motor is 
achieved and then it will enter constant power mode, and unless there 
are new motor controller designs available in commerce, PSC motors with 
controls will adjust along a path of constant torque until the power 
limit is reached then along a constant power mode. Morrison added that 
this is also true for BPM (i.e., constant torque). (Morrison, No. 27 at 
p. 6) In addition, Morrison commented that the curves in section 7C.3 
of the PA TSD have a curious feature that gives the reader the 
suggestion that the BPM-CT uses less power that the BPM-CA, and that 
the use of pressure for the independent variable gives rise to this 
curious effect. Morrison commented that at the same operating point, 
flow, and pressure, the two motors (assuming same design/manufacturer) 
in the same appliance (same furnace and fan) would have virtually the 
same efficiency and thus the watts consumed would be about the same. 
Morrison stated that because of this oddity, further limited response 
time was not spent analyzing these curves in greater detail, but 
Morrison commented that the oddity raises question as to the validity 
of the analysis as it relates to real products. (Morrison, No. 27 at p. 
6)
    DOE's analysis relied on the manufacturer product literature and 
how the data was presented in terms of using pressure as the variable 
for the furnace fan equations. DOE contends that since the furnace fan 
energy use operates at a few specific operating conditions (one or more 
at heating, cooling, and/or continuous fan), that DOE's approach is 
valid in capturing the field energy use for furnace fans. Additionally, 
DOE validated its energy use methodology approach by comparing it to 
available field data measuring energy use of furnace fans in the field 
26 27 and building model data.\28\ DOE acknowledges that it 
is expected to see a higher pressure for constant airflow BPM and the 
watts/cfm should be the same for both constant airflow BPM and constant 
torque BPM. DOE notes that there may be inconsistency because of some 
errors made in the PA documentation. However, for this NOPD analysis, 
DOE has largely maintained the methodology from the preliminary 
analysis. DOE would like to note that even if there were further 
updates to the energy use analysis, it would likely result in lower 
energy savings and consumer net cost, and thus the conclusions of the 
determination would remain the same.
---------------------------------------------------------------------------

    \26\ Pigg, S. Central Electricity Use by New Furnaces: A 
Wisconsin Field Study. 2003. Accessible at: www.proctoreng.com/dnld/WIDOE2013.pdf (last accessed: Jun. 1, 2023).
    \27\ Wilcox, B., J. Proctor, R. Chitwood, and K. Nittler. 
Furnace Fan Watt Draw and Air Flow in Cooling and Air Distribution 
Modes. 2008 California Building Energy Efficiency Standards. 2006.
    \28\ See eta-publications.lbl.gov/sites/default/files/furnace_blower_electricity_national_and_regional_savings_potential_lbnl_417e.pdf.
---------------------------------------------------------------------------

    Trane commented that according to DOE, the RECS results regarding 
heating energy use identifies NWG-NC as 6.8 and NWG-C as 43.3 MMBtu. 
However, Trane commented that based on industry sales, their values 
should be almost equal, or NWG-NC should be greater than NWG-C. (Trane, 
No. 22 at p. 3) DOE clarifies that its analysis assumes that in 2030 
the heating load is 26.1 MMBtu/yr for NWG-NC and 37.1 MMBty/yr for NWG-
C. This is based on shipments data by states that show that Northern 
states tend to have a much larger fraction of condensing furnaces 
compared to Rest of Country states. Therefore, the NWG-C sample 
includes more homes in colder climates with higher heating loads.
    Trane commented that DOE defines the AFUE of a new unit as 96 
percent, whereas a recent NOPR defines the minimum AFUE as 95 percent. 
(Trane, No. 22 at p. 3) Trane questioned DOE's assumption that the AFUE 
of an existing unit is 92 percent, stating that this value should be 
closer to 95 percent given that a unit's AFUE does not change much over 
time. (Trane, No. 22 at p. 3) Trane also commented that because DOE 
identifies the AFUE for an existing

[[Page 69853]]

NWG-C unit to be less than that of a new NWG-C unit, then the AFUE for 
an existing NWG-NC unit should also be less than that of a new NWG-NC 
unit. (Trane, No. 22 at p. 3) DOE clarifies that it defined the AFUE of 
new units based on the projected market shares by AFUE in 2030. For 
NWG-C units, the market share was also divided into North and Rest of 
Country and ranged from 90% AFUE to 98%, with an overall shipment 
weighted average 95% AFUE. In terms of the existing AFUE unit, DOE 
analysis is set such that the AFUE of the existing unit is always equal 
or less than the AFUE of the new unit.
    Trane commented that the correct basis for furnace fan AFUE should 
be ASHRAE 103-1993 and not ASHRAE 103-2022, as stated by DOE in the 
TSD. (Trane, No. 22 at p. 3) DOE relies on the supplementary energy use 
equations found in ASHRAE 103-2022, the latest ASHRAE test procedure. A 
NIST report \29\ and LBNL reports \30\ have found the updated version 
to be more accurate to estimate the energy use of furnaces, especially 
two-stage and modulating furnaces.
---------------------------------------------------------------------------

    \29\ Stanely, Liu. 2002. Proposed Revisions of Part of the Test 
Procedure for Furnaces and Boilers in ASHRAE Standard 103-1993. 
September. Gaithersburg, Md.: U.S. Department of Commerce, National 
Institute of Standards and Technology, Building Environment 
Division, Building and Fire Research Laboratory.
    \30\ See eta.lbl.gov/publications/residential-two-stage-gas-furnaces-do; and see eta.lbl.gov/publications/furnace-blower-electricity-national.
---------------------------------------------------------------------------

    Trane commented that the use of adjustment factors for FER, HHL, 
COH, and HCL is inconsistent with adjustment factor use in the Furnace 
TSD, EERE-2014-BT-STD-0031-0320. (Trane, No. 22 at p. 3) Trane also 
commented on inconsistencies between the Preliminary Consumer Furnace 
Fan LCC and PBP Analysis document (EERE-2021-BT-STD-0029-0012) and the 
furnace fan TP (CFR Title 10, chapter 2, subchapter D, part 430, 
subpart B, appendix AA): (1) the TSD states the range of airflow to be 
300-500 CFM/nominal ton, but the calculations were conducted at 400 
CFM/nominal ton rather than 500 CFM/nominal ton; (2) the TP requires 
the heating airflow control to be set at the maximum, while the TSD 
states that the heating airflow control setting can span a range 
between 35-65 [deg]F and that the max heating airflow control setting 
should be set to achieve a 35 [deg]F rise, but the calculation used in 
the TSD utilizes a 50 [deg]F rise which is much lower than the maximum 
CFM; (3) the FER adjustment factor was not addressed in either the TSD 
or the LCC and PA documents; and (4) the FER adjustment factor was only 
applied to the intercept of the polynomial equation to determine 
wattage and not to the entire watt/CFM equation. (Trane, No. 22 at p. 
4)
    DOE's LCC analysis applies a temperature rise distribution ranging 
from 30 degrees to 80 degrees, with an average of 60 degrees, which is 
consistent with manufacturer product literature and field installation 
data. The LCC analysis also applies a CFM/ton distribution ranging from 
300 to 500, with an average of around 400 CFM/ton, which is the more 
commonly used value both in manufacturer product literature information 
and in the majority of installations. The FER adjustment factor is only 
used to make sure the performance curves match the FER ratings at each 
efficiency level. For this NOPD analysis, DOE has largely maintained 
the methodology from the prelim analysis. DOE would like to note that 
even if there were further updates to the energy use analysis, it would 
likely result in lower energy savings and consumer net cost, and thus 
the conclusions of the determination would remain the same.

E. Life-Cycle Cost and Payback Period Analysis

    DOE conducted LCC and PBP analyses to evaluate the economic impacts 
on individual consumers of potential energy conservation standards for 
consumer furnace fans. The effect of new or amended energy conservation 
standards on individual consumers usually involves a reduction in 
operating cost and an increase in purchase cost. DOE used the following 
two metrics to measure consumer impacts:
     The LCC is the total consumer expense of an appliance or 
product over the life of that product, consisting of total installed 
cost (manufacturer selling price, distribution chain markups, sales 
tax, and installation costs) plus operating costs (expenses for energy 
use, maintenance, and repair). To compute the operating costs, DOE 
discounts future operating costs to the time of purchase and sums them 
over the lifetime of the product.
     The PBP is the estimated amount of time (in years) it 
takes consumers to recover the increased purchase cost (including 
installation) of a more-efficient product through lower operating 
costs. DOE calculates the PBP by dividing the change in purchase cost 
at higher efficiency levels by the change in annual operating cost for 
the year that amended or new standards are assumed to take effect.
    For any given efficiency level, DOE measures the change in LCC 
relative to the LCC in the no-new-standards case, which reflects the 
estimated efficiency distribution of consumer furnace fans in the 
absence of new or amended energy conservation standards. In contrast, 
the PBP for a given efficiency level is measured relative to the 
baseline product.
    For each considered efficiency level in each product class, DOE 
calculated the LCC and PBP for a nationally representative set of 
housing units and, for NWGFs, also commercial buildings. As stated 
previously, DOE developed household samples from 2015 RECS and CBECS 
2012. For each sample household, DOE determined the energy consumption 
for the consumer furnace fans and the appropriate energy price. By 
developing a representative sample of households, the analysis captured 
the variability in energy consumption and energy prices associated with 
the use of consumer furnace fans.
    Inputs to the calculation of total installed cost include the cost 
of the product--which includes MPCs, manufacturer markups, retailer and 
distributor markups, and sales taxes--and installation costs. Inputs to 
the calculation of operating expenses include annual energy 
consumption, energy prices and price projections, repair and 
maintenance costs, product lifetimes, and discount rates. DOE created 
distributions of values for product lifetime, discount rates, and sales 
taxes, with probabilities attached to each value, to account for their 
uncertainty and variability.
    The computer model DOE uses to calculate the LCC and PBP relies on 
a Monte Carlo simulation to incorporate uncertainty and variability 
into the analysis. The Monte Carlo simulations randomly sample input 
values from the probability distributions and consumer furnace fan user 
samples. For this determination, the Monte Carlo approach is 
implemented in MS Excel together with the Crystal Ball\TM\ add-on.\31\ 
The model calculated the LCC and PBP for products at each efficiency 
level for 10,000 consumers per simulation run. The analytical results 
include a distribution of 10,000 data points showing the range of LCC 
savings for a given efficiency level relative to the no-new-standards 
case efficiency distribution. In performing an iteration of the Monte 
Carlo simulation for a given consumer, product efficiency is

[[Page 69854]]

chosen based on its probability. If the chosen product efficiency is 
greater than or equal to the efficiency of the standard level under 
consideration, the LCC and PBP calculation reveals that a consumer is 
not impacted by the standard level. By accounting for consumers who 
already purchase more-efficient products, DOE avoids overstating the 
potential benefits from increasing product efficiency.
---------------------------------------------------------------------------

    \31\ Crystal Ball\TM\ is commercially-available software tool to 
facilitate the creation of these types of models by generating 
probability distributions and summarizing results within Excel, 
available at www.oracle.com/technetwork/middleware/crystalball/overview/index.html (last accessed July 6, 2018).
---------------------------------------------------------------------------

    DOE calculated the LCC and PBP for all consumers of consumer 
furnace fans as if each were to purchase a new product in the expected 
year of required compliance with new or amended standards. For purposes 
of its analysis, DOE used 2030 as the first year of compliance with any 
amended standards for consumer furnace fans.
    Table IV.20 summarizes the approach and data DOE used to derive 
inputs to the LCC and PBP calculations. The subsections that follow 
provide further discussion.

 Table IV.20--Summary of Inputs and Methods for the LCC and PBP Analysis
                                    *
------------------------------------------------------------------------
              Inputs                            Source/method
------------------------------------------------------------------------
Product Cost......................  Derived from the manufacturer
                                     production cost (MPC) for furnace
                                     fans at different heating input
                                     capacities for each efficiency
                                     level (from the engineering
                                     analysis). The MPCs are then
                                     multiplied by the various market
                                     participant markups (e.g.,
                                     manufacturer, wholesaler, and
                                     plumbing contractor) for each
                                     distribution channel and sales
                                     taxes derived for each state and
                                     the District of Columbia.
Installation Costs................  Varies by efficiency level and
                                     individual house/building
                                     characteristic. Material and labor
                                     costs are derived for each state
                                     and the District of Columbia mainly
                                     using RSMeans Residential Cost Data
                                     2023. Overhead and profits are
                                     included in the RSMeans data.
                                     Probability distributions are
                                     derived for various installation
                                     cost input parameters.
Annual Energy Use.................  Derived mainly by using the heating
                                     energy use data for each housing
                                     unit and building from Energy
                                     Information Administration (EIA)'s
                                     2015 Residential Energy Consumption
                                     Survey (RECS 2015) and EIA's 2012
                                     Commercial Buildings Energy
                                     Consumption Survey (CBECS 2012)
                                     together with consumer furnace fans
                                     test procedure calculation
                                     methodologies used to determine the
                                     annual energy consumption
                                     associated with the considered
                                     standard levels. Probability
                                     distributions are derived for
                                     various input parameters.
Energy Prices.....................  Calculated monthly marginal average
                                     electricity, natural gas or LPG,
                                     and fuel oil prices in each of the
                                     50 U.S. states and District of
                                     Columbia using EIA historical data
                                     and billing data for each RECS 2015
                                     housing unit and CBECS 2012
                                     building.
Energy Price Trends...............  Residential and commercial prices
                                     were escalated by using EIA's 2023
                                     Annual Energy Outlook (AEO 2023)
                                     forecasts to estimate future energy
                                     prices. Escalation was performed at
                                     the census division level.
Repair and Maintenance Costs......  Estimated the costs associated with
                                     preventive maintenance (e.g.,
                                     checking furnace fan) and repair
                                     (e.g., replacing motor) based on
                                     data from a variety of published
                                     sources including RSMeans 2023
                                     Facilities Maintenance and Repair
                                     Data. It is assumed that
                                     maintenance and repair costs vary
                                     by efficiency level and probability
                                     distributions are derived for
                                     various input parameters.
Product Lifetime..................  Used Weibull probability
                                     distribution of lifetimes developed
                                     for consumer furnace fans based on
                                     various survey and shipments data.
Discount Rates....................  Probability distributions by income
                                     bins are derived for residential
                                     discount rates based on multiple
                                     Federal Reserve Board's Survey of
                                     Consumer Finances from 1995-2019
                                     and various interest rate sources.
                                     Probability distributions for
                                     commercial discount rates for
                                     various building activities (e.g.,
                                     office) are derived using multiple
                                     interest rate sources. See section
                                     IV.E.7.
Compliance Date...................  2030 (5 years after expected
                                     publication of the final rule).
------------------------------------------------------------------------
* References for the data sources mentioned in this table are provided
  in the sections following the table or in chapter 8 of the PA TSD.

1. Product Cost
    To calculate consumer product costs, DOE multiplied the MPCs 
developed in the engineering analysis by the markups described 
previously (along with sales taxes). DOE used different markups for 
baseline products and higher-efficiency products, because DOE applies 
an incremental markup to the increase in MSP associated with higher-
efficiency products.
    DOE assumed no price trend for consumer furnace fans due to 
uncertainty in future commodity prices. See chapter 8 of the PA TSD for 
details.
2. Installation Cost
    Installation cost includes labor, overhead, and any miscellaneous 
materials and parts needed to install the product. Because consumer 
furnace fans are installed in furnaces in the factory, there is 
generally no additional installation cost in the home. However, 
consumer furnace fans that employ a constant-airflow BPM design may 
require additional installation costs. DOE assumed that all constant-
airflow BPM furnace fan installations will require extra labor at 
startup to check and adjust airflow.
    DOE estimated the installation costs at each considered efficiency 
level using a variety of sources, including RSMeans data, manufacturer 
literature, and information from an expert consultant report. DOE's 
analysis of installation costs accounted for regional differences in 
labor costs. For a detailed discussion of the development of 
installation costs, see appendix 8C of the PA TSD.
3. Annual Energy Consumption
    For each sampled household or commercial building, DOE determined 
the energy consumption for a consumer furnace fan at different 
efficiency levels using the approach described previously in section 
IV.D of this document.
4. Energy Prices
    A marginal energy price reflects the cost or benefit of adding or 
subtracting one additional unit of energy consumption. Because marginal 
price more accurately captures the incremental savings associated with 
a change in energy use from higher efficiency, it provides a better 
representation of incremental change in consumer costs than average 
electricity prices. Therefore, DOE applied average natural gas and 
electricity prices for the energy use of the product purchased in the 
no-new-standards case, and marginal prices for the incremental change 
in energy use associated with the other efficiency levels considered.
    DOE derived average monthly marginal residential and commercial 
electricity, natural gas, LPG, and fuel oil prices for each State using 
data from

[[Page 69855]]

EIA.32 33 34 DOE calculated marginal monthly regional energy 
prices by: (1) first estimating an average annual price for each 
region; (2) multiplying by monthly energy price factors; and (3) 
multiplying by seasonal marginal price factors for electricity, natural 
gas, and LPG. The analysis used historical data up to 2022 for 
residential and commercial natural gas and electricity prices and 
historical data up to 2021 for LPG and fuel oil prices. Further details 
may be found in chapter 8 of the PA TSD.
---------------------------------------------------------------------------

    \32\ U.S. Department of Energy-Energy Information 
Administration, Form EIA-861M (formerly EIA-826) detailed data 
(2022) (Available at: www.eia.gov/electricity/data/eia861m/) (Last 
accessed Jun. 1, 2023).
    \33\ U.S. Department of Energy-Energy Information 
Administration, Natural Gas Navigator (2022) (Available at: 
www.eia.gov/naturalgas/data.php) (Last accessed Jun. 1, 2023).
    \34\ U.S. Department of Energy-Energy Information 
Administration, 2021 State Energy Data System (SEDS) (2021) 
(Available at: www.eia.gov/state/seds/) (Last accessed Jun. 1, 
2023).
---------------------------------------------------------------------------

    DOE compared marginal price factors developed by DOE from the EIA 
data to develop seasonal marginal price factors for 23 gas tariffs 
provided by the Gas Technology Institute for the 2016 residential 
boilers energy conservation standards rulemaking.\35\ DOE found that 
the winter price factors used by DOE are generally comparable to those 
computed from the tariff data, indicating that DOE's marginal price 
estimates are reasonable at average usage levels. The summer price 
factors are also generally comparable. Of the 23 tariffs analyzed, 
eight have multiple tiers, and of these eight, six have ascending rates 
and two have descending rates. The tariff-based marginal factors use an 
average of the two tiers as the commodity price. A full tariff-based 
analysis would require information about the household's total baseline 
gas usage (to establish which tier the consumer is in), and a weight 
factor for each tariff that determines how many customers are served by 
that utility on that tariff. These data are generally not available in 
the public domain. DOE's use of EIA State-level data effectively 
averages overall consumer sales in each State, and so incorporates 
information from all utilities. DOE's approach is, therefore, more 
representative of a large group of consumers with diverse baseline gas 
usage levels than an approach that uses only tariffs.
---------------------------------------------------------------------------

    \35\ GTI provided a reference located in the docket of DOE's 
2016 rulemaking to develop energy conservation standards for 
residential boilers. (Docket No. EERE-2012-BT-STD-0047-0068) 
(Available at: www.regulations.gov/document/EERE-2012-BT-STD-0047-0068) (Last accessed June 1, 2023).
---------------------------------------------------------------------------

    DOE notes that within a State, there could be significant variation 
in the marginal price factors, including differences between rural and 
urban rates. To take this into account, DOE developed marginal price 
factors for each individual household using RECS 2015 billing data. 
These data are then normalized to match the average State marginal 
price factors, which are equivalent to a consumption-weighted average 
marginal price across all households in the State. For more details on 
the comparative analysis and updated marginal price analysis, see 
appendix 8D of the PA TSD. To estimate energy prices in future years, 
DOE multiplied the 2022 energy prices by the projection of annual 
average price changes for each of the nine Census Divisions from the 
Reference case in AEO2023, which has an end year of 2050.\36\ To 
estimate price trends after 2050, DOE used the average annual rate of 
change in prices from 2046 through 2050.
---------------------------------------------------------------------------

    \36\ EIA. Annual Energy Outlook 2023 with Projections to 2050. 
Washington, DC. Available at www.eia.gov/forecasts/aeo/ (last 
accessed Jun. 1, 2023).
---------------------------------------------------------------------------

5. Maintenance and Repair Costs
    The maintenance cost is the routine cost to the consumer of 
maintaining product operation. The regular furnace maintenance 
generally includes checking the furnace fan. DOE assumes that this 
maintenance cost is the same at all efficiency levels.
    The repair cost is the cost to the consumer for replacing or 
repairing components in the consumer furnace fan that have failed. DOE 
included motor replacement as a repair cost for a fraction of furnace 
fans. To estimate rates of motor failure, DOE developed a distribution 
of fan motor lifetime (expressed in operating hours) by motor size 
using data from DOE's analysis for small electric motors and 
manufacturer literature. (75 FR 10874) DOE then paired these data with 
the calculated number of annual operating hours for each sample furnace 
fan. Motor costs were based on costs developed in the engineering 
analysis and the replacement markups developed in the markup analysis. 
DOE assumed that the motor cost does not apply if motor failure occurs 
during the furnace warranty period (assumed to be at least 1 year and 5 
or more years for a fraction of installations).
    The repair costs (including labor hours, component costs, and 
frequency) at each considered efficiency level are derived based on 
RSMeans data,\37\ manufacturer literature, and a report from the Gas 
Research Institute (GRI).\38\ DOE accounted for regional differences in 
labor costs. For a detailed discussion of the development of 
maintenance and repair costs, see appendix 8E of the PA TSD.
---------------------------------------------------------------------------

    \37\ RSMeans Company Inc., RS Means Facilities Maintenance & 
Repair Cost Data (2021) (Available at: www.rsmeans.com/) (Last 
accessed Jun. 1, 2023).
    \38\ Jakob, F.E., J.J. Crisafulli, J.R. Menkedick, R.D. Fischer, 
D.B. Philips, R.L. Osbone, J.C. Cross, G.R. Whitacre, J.G. Murray, 
W.J. Sheppard, D.W. DeWirth, and W.H. Thrasher, Assessment of 
Technology for Improving the Efficiency of Residential Gas Furnaces 
and Boilers, Volume I and II--Appendices (September 1994) Gas 
Research Institute, Report No. GRI-94/0175 (Available at: 
www.gti.energy/software-and-reports/) (Last accessed Feb. 15, 2022).
---------------------------------------------------------------------------

6. Product Lifetime
    The product lifetime is the age at which a product is retired from 
service. Furnace fan lifetimes are considered equivalent to furnace 
lifetimes, so DOE modeled furnace fan lifetime based on estimated 
furnace lifetimes. Because product lifetime varies, DOE uses a lifetime 
distribution to characterize the probability that a product will be 
retired from service at a given age. DOE conducted an extensive 
literature review and took into account published studies. Because the 
basis for the estimates in the literature was uncertain, DOE developed 
a method using national survey data, along with shipment data, to 
estimate the distribution of consumer furnace lifetimes in the field.
    DOE assumed that the probability function for the annual survival 
of consumer furnace would take the form of a Weibull distribution. DOE 
derived the Weibull distribution parameters by using stock and age data 
on consumer furnaces from U.S. Census's biennial American Housing 
Survey (AHS) from 1974-2019 \39\ and EIA's RECS 1990, 1993, 2001, 2005, 
2009, and 2015.\40\
---------------------------------------------------------------------------

    \39\ U.S. Census Bureau: Housing and Household Economic 
Statistics Division, American Housing Survey, Multiple Years (1974, 
1975, 1976, 1977, 1978, 1979, 1980, 1981, 1983, 1985, 1987, 1989, 
1991, 1993, 1995, 1997, 1999, 2001, 2003, 2005, 2007, 2009, 2011, 
2013, 2015, 2017, 2019, and 2021). (Available at https://www.census.gov/programs-surveys/ahs.html) (Last accessed June 1, 
2023).
    \40\ U.S. Department of Energy: Energy Information 
Administration, Residential Energy Consumption Survey (``RECS''), 
Multiple Years (1990, 1993, 1997, 2001, 2005, 2009, and 2015). 
(Available at www.eia.gov/consumption/residential/) (Last accessed 
June 1, 2023).
---------------------------------------------------------------------------

    DOE used the results from the 2019 AHCS survey to estimate the 
national average lifetime of 21.4 years. DOE also determined the 
average lifetime for different regions: 22.5 years for the North region 
and 20.2 years for rest of

[[Page 69856]]

the country. These results are used to scale the average lifetime for 
these regions.
7. Discount Rates
    In the calculation of LCC, DOE applies discount rates appropriate 
to households to estimate the present value of future operating cost 
savings. DOE estimated a distribution of discount rates for consumer 
furnace fans based on the opportunity cost of consumer funds.
    DOE applies weighted average discount rates calculated from 
consumer debt and asset data, rather than marginal or implicit discount 
rates.\41\ The LCC analysis estimates net present value over the 
lifetime of the product, so the appropriate discount rate will reflect 
the general opportunity cost of household funds, taking this time scale 
into account. Given the long-time horizon modeled in the LCC analysis, 
the application of a marginal interest rate associated with an initial 
source of funds is inaccurate. Regardless of the method of purchase, 
consumers are expected to continue to rebalance their debt and asset 
holdings over the LCC analysis period, based on the restrictions 
consumers face in their debt payment requirements and the relative size 
of the interest rates available on debts and assets. DOE estimates the 
aggregate impact of this rebalancing using the historical distribution 
of debts and assets.
---------------------------------------------------------------------------

    \41\ The implicit discount rate is inferred from a consumer 
purchase decision between two otherwise identical goods with 
different first cost and operating cost. It is the interest rate 
that equates the increment of first cost to the difference in net 
present value of lifetime operating cost, incorporating the 
influence of several factors: transaction costs; risk premiums and 
response to uncertainty; time preferences; interest rates at which a 
consumer is able to borrow or lend. The implicit discount rate is 
not appropriate for the LCC analysis because it reflects a range of 
factors that influence consumer purchase decisions, rather than the 
opportunity cost of the funds that are used in purchases.
---------------------------------------------------------------------------

    To establish residential discount rates for the LCC analysis, DOE 
identified all relevant household debt or asset classes in order to 
approximate a consumer's opportunity cost of funds related to appliance 
energy cost savings. It estimated the average percentage shares of the 
various types of debt and equity by household income group using data 
from the Federal Reserve Board's Survey of Consumer Finances \42\ 
(``SCF'') for 1995, 1998, 2001, 2004, 2007, 2010, 2013, 2016, and 2019. 
Using the SCF and other sources, DOE developed a distribution of rates 
for each type of debt and asset by income group to represent the rates 
that may apply in the year in which amended standards would take 
effect. DOE assigned each sample household a specific discount rate 
drawn from one of the distributions. The average rate across all types 
of household debt and equity and income groups, weighted by the shares 
of each type, is 4.1 percent. See chapter 8 of the PA TSD for further 
details on the development of consumer discount rates.
---------------------------------------------------------------------------

    \42\ The Federal Reserve Board, Survey of Consumer Finances 
(1995, 1998, 2001, 2004, 2007, 2010, 2013, 2016, and 2019) 
(Available at: www.federalreserve.gov/econres/scfindex.htm) (Last 
accessed Jun. 1, 2023).
---------------------------------------------------------------------------

    To establish commercial discount rates for the small fraction of 
consumer furnace fans in commercial buildings, DOE estimated the 
weighted-average cost of capital using data from Damodaran Online.\43\ 
The weighted-average cost of capital is commonly used to estimate the 
present value of cash flows to be derived from a typical company 
project or investment. Most companies use both debt and equity capital 
to fund investments, so their cost of capital is the weighted average 
of the cost to the firm of equity and debt financing. DOE estimated the 
cost of equity using the capital asset pricing model, which assumes 
that the cost of equity for a particular company is proportional to the 
systematic risk faced by that company. DOE's commercial discount rate 
approach is based on the methodology described in a LBNL report, and 
the distribution varies by business activity. The average rate for 
consumer furnace fans used in commercial applications in this analysis, 
across all business activity, is 7.2 percent.
---------------------------------------------------------------------------

    \43\ Damodaran, A. Data Page: Historical Returns on Stocks, 
Bonds and Bills-United States. 2023. (Last accessed Jun. 1, 2023) 
pages.stern.nyu.edu/~adamodar/.
---------------------------------------------------------------------------

    See chapter 8 of the PA TSD for further details on the development 
of consumer and commercial discount rates.
    Morrison recommended that DOE take into account Federal rate 
increases, which are moving to a more typical state as compared to 
DOE's selected range from 1995-2019, in which rates were historically 
low. (Morrison, No. 27 at p. 4) DOE relies on the most recent Survey of 
Consumer Finance data available, which includes all data available from 
2015-2019. In addition, many of the interest rate data used in the 
discount rate analysis is based on the latest 30-year average, which is 
updated to 1993-2022 for this NOPD. While DOE acknowledges that there 
have been interest rate increases in the recent past, DOE cannot 
conclude that more recent data would be more representative of discount 
rates in the considered year of compliance, 2030, than the best 
available time series of data DOE is currently using. For this reason, 
DOE has not changed its methodology for determining consumer discount 
rates.
8. Energy Efficiency Distribution in the No-New-Standards Case
    To accurately estimate the share of consumers that would be 
affected by a potential energy conservation standard at a particular 
efficiency level, DOE's LCC analysis considered the projected 
distribution (market shares) of product efficiencies under the no-new-
standards case (i.e., the case without amended or new energy 
conservation standards).
    For consumer furnace fans, DOE does not have any shipments data by 
efficiency after the 2019 furnace fan standard became effective. To 
cover the lack of available shipments data, DOE used the DOE's 
Compliance Certification Management System (CCMS) Database for furnace 
fans and furnaces to develop efficiency distribution based on available 
models. Table IV.21 shows the resulting market shares by efficiency 
level. For a detailed discussion of the development of no-new-standards 
case distributions based on models, see appendix 7F of the PA TSD.

      Table IV.21--No-New-Standards Case Energy Efficiency Distributions in 2030 for Consumer Furnace Fans
----------------------------------------------------------------------------------------------------------------
                                                                                  No-new-   Efficiency level (%)
                           Product class                                 EL      standards ---------------------
                                                                                 case (%)       1          2
----------------------------------------------------------------------------------------------------------------
Non-Weatherized, Non-Condensing Gas Furnace Fan....................          0         100  .........  .........
                                                                             1  ..........        100  .........
Non-Weatherized, Condensing Gas Furnace Fan........................          0         100  .........  .........

[[Page 69857]]

 
                                                                             1  ..........        100  .........
Weatherized Non-Condensing Gas Furnace Fan.........................          0         100  .........  .........
                                                                             1  ..........        100  .........
Non-Weatherized, Non-Condensing Oil Furnace Fan....................          0          46  .........  .........
                                                                             1          54        100  .........
                                                                             2  ..........  .........        100
Non-Weatherized Electric Furnace/Modular Blower Fan................          0         100  .........  .........
                                                                             1  ..........        100  .........
Mobile Home Non-Weatherized, Non-Condensing Gas Furnace Fan........          0          11  .........  .........
                                                                             1          89        100  .........
                                                                             2  ..........  .........        100
Mobile Home Non-Weatherized, Condensing Gas Furnace Fan............          0           8  .........  .........
                                                                             1          92        100  .........
                                                                             2  ..........  .........        100
Mobile Home Non-Weatherized Oil Furnace Fan........................          0          90  .........  .........
                                                                             1          10        100  .........
                                                                             2  ..........  .........        100
Mobile Home Electric Furnace/Modular Blower Fan....................          0         100  .........  .........
                                                                             1  ..........        100  .........
----------------------------------------------------------------------------------------------------------------

    AHRI and Lennox commented that model counts in the certification 
directory do not reflect sales volume, and that a high number of models 
produced at a specific efficiency level does not necessarily imply a 
large market share of those products. (AHRI, No. 23 at p. 4; Lennox, 
No. 24 at p. 4) Lennox further stated that industry and manufacturers 
do not generally track shipment data of products that may exceed the 
baseline because while consumers may consider AFUE when purchasing a 
residential furnace, furnace fans are not a feature upon which 
consumers base their purchase decisions. (Lennox, No. 24 at p. 8)
    As indicated by Lennox, DOE has not been able to obtain other 
information to develop a no-new-standards case efficiency distribution, 
and as such, continues to rely on model availability as a proxy.
9. Payback Period Analysis
    The payback period is the amount of time it takes the consumer to 
recover the additional installed cost of more-efficient products, 
compared to baseline products, through energy cost savings. Payback 
periods are expressed in years. Payback periods that exceed the life of 
the product mean that the increased total installed cost is not 
recovered in reduced operating expenses.
    The inputs to the PBP calculation for each efficiency level are the 
change in total installed cost of the product and the change in the 
first-year annual operating expenditures relative to the baseline. The 
PBP calculation uses the same inputs as the LCC analysis, except that 
discount rates are not needed.

F. Shipments Analysis

    DOE uses projections of annual product shipments to calculate the 
national impacts of potential amended or new energy conservation 
standards on energy use, NPV, and future manufacturer cash flows.\44\ 
The shipments model takes an accounting approach in tracking market 
shares of each product class and the vintage of units in the stock. 
Stock accounting uses product shipments as inputs to estimate the age 
distribution of in-service product stocks for all years. The age 
distribution of in-service product stocks is a key input to 
calculations of both the NES and NPV, because operating costs for any 
year depend on the age distribution of the stock.
---------------------------------------------------------------------------

    \44\ DOE uses data on manufacturer shipments as a proxy for 
national sales, as aggregate data on sales are lacking. In general, 
one would expect a close correspondence between shipments and sales.
---------------------------------------------------------------------------

    DOE developed shipment projections based on historical data and an 
analysis of key market drivers for each product. The vast majority of 
furnace fans are shipped installed in furnaces, so DOE estimated 
furnace fan shipments by projecting furnace shipments in three market 
segments: (1) replacements, (2) new housing, and (3) new owners in 
buildings that did not previously have a central furnace.
    To project furnace replacement shipments, DOE developed retirement 
functions for furnaces from the lifetime estimates and applied them to 
the existing products in the housing stock. The existing stock of 
products is tracked by vintage and developed from historical shipments 
data. The shipments analysis uses a distribution of furnace lifetimes 
to estimate furnace replacement shipments. In addition, DOE adjusted 
replacement shipments by taking into account demolitions, using the 
estimated changes to the housing stock from AEO2023.
    DOE assembled historical shipments data for consumer furnaces from 
Appliance Magazine from 1954-2012,\45\ AHRI from 1996-2022,\46\ HARDI 
from 2013-2022,\47\ and BRG from 2007-2022.\48\ DOE also used the 1992 
and 1994-2003 shipments data by State provided by AHRI \49\ and 2004-
2009 and 2010-2015 shipments data by the North region and the rest of 
country

[[Page 69858]]

provided by AHRI,\50\ as well as HARDI shipments data that is 
disaggregated by region and most States to disaggregate shipments by 
region. DOE also used CBECS 2012 data and BRG shipments data to 
estimate the commercial fraction of shipments. Disaggregated shipments 
for MHGFs are not available, so DOE disaggregated MHGF shipments from 
the total by using a combination of data from the U.S. 
Census,51 52 American Housing Survey (AHS),\53\ RECS,\54\ 
and a 2014 MHGF shipments estimate by Mortex.\55\
---------------------------------------------------------------------------

    \45\ Appliance Magazine. Appliance Historical Statistical 
Review: 1954-2012 (2014).
    \46\ Air-Conditioning, Heating, & Refrigeration Institute, 
Furnace Historical Shipments Data. (1996-2022) (Available at: 
https://www.ahrinet.org/analytics/statistics/historical-data/furnaces-historical-data) (Last accessed June 1, 2023).
    \47\ Heating, Air-conditioning and Refrigeration Distributors 
International (HARDI). Gas Furnace Shipments Data from 2013-2022 
(Provided to Lawrence Berkeley National Laboratory).
    \48\ BRG Building Solutions. The North American Heating & 
Cooling Product Markets (Available at: https://www.brgbuildingsolutions.com/solutions/market-reports/) (Last 
accessed Jun. 1, 2023).
    \49\ Air-Conditioning, Heating, and Refrigeration Institute 
(formerly Gas Appliance Manufacturers Association). Updated 
Shipments Data for Residential Furnaces and Boilers, April 25, 2005 
(Available at: www.regulations.gov/document/EERE-2006-STD-0102-0138) 
(Last accessed June 1 2023).
    \50\ Air-Conditioning, Heating, and Refrigeration Institute. 
Non-Condensing and Condensing Regional Gas Furnace Shipments for 
2004-2009 and 2010-2015 Data Provided to DOE contractors, July 20, 
2010 and November 26, 2016.
    \51\ U.S. Census Bureau, Manufactured Homes Survey: Annual 
Shipments to States from 1994-2022 (Available at: https://www.census.gov/data/tables/time-series/econ/mhs/latest-data.html) 
(Last accessed June 1, 2023).
    \52\ U.S. Census Bureau, Manufactured Homes Survey: Historical 
Annual Placements by State from 1980-2013 (Available at: 
www.census.gov/data/tables/time-series/econ/mhs/historical-annual-placements.html) (Last accessed June 1, 2023).
    \53\ U.S. Census Bureau--Housing and Household Economic 
Statistics Division, American Housing Survey, multiple years from 
1973-2021 (Available at: www.census.gov/programs-surveys/ahs/data.html) (Last accessed June 1, 2023).
    \54\ Energy Information Administration (EIA). Residential Energy 
Consumption Survey (RECS), multiple years from 1979-2015 (Available 
at: www.eia.gov/consumption/residential/) (Last accessed June 1, 
2023).
    \55\ Mortex estimated that the total number of MHGFs 
manufactured in 2014 was about 54,000, and about two-thirds were 
sold to the replacement market. Mortex also stated that MHGF sales 
have not been growing. (Mortex, No. 0157 at p. 3) (Available at: 
www.regulations.gov/document/EERE-2014-BT-STD-0031-0157) (Last 
accessed June 1, 2023).
---------------------------------------------------------------------------

    To project shipments to the new housing market, DOE utilized a 
projection of new housing construction and historic saturation rates of 
various furnaces in new housing. DOE used the AEO2023 housing starts 
and commercial building floor space projections and data from U.S. 
Census Characteristics of New Housing,56 57 Home Innovation 
Research Labs Annual Builder Practices Survey,\58\ RECS 2015, AHS 2021, 
and CBECS 2012 to estimate new construction saturations. DOE also 
estimated future furnace saturation rates in new single-family housing 
based on a weighted average of values from the U.S. Census Bureau's 
Characteristics of New Housing from 1999 through 2022, and for multi-
family building using data from Census Bureau's Characteristics of New 
Housing (Multi-Family Units) from 1973 through 2022.\59\
---------------------------------------------------------------------------

    \56\ U.S. Census. Characteristics of New Housing from 1999-2022 
(Available at: www.census.gov/construction/chars/) (Last accessed 
June 1, 2023).
    \57\ U.S. Census. Characteristics of New Housing (Multi-Family 
Units) from 1973-2022 (Available at: www.census.gov/construction/chars/mfu.html) (Last accessed June 1, 2023).
    \58\ Home Innovation Research Labs (independent subsidiary of 
the National Association of Home Builders (NAHB). Annual Builder 
Practices Survey (2015-2019) (Available at: www.homeinnovation.com/trends_and_reports/data/new_construction) (Last accessed June 1, 
2023).
    \59\ U.S. Census Bureau, Characteristics of New Housing 
(Available at: www.census.gov/construction/chars/) (Last accessed 
June 1, 2023).
---------------------------------------------------------------------------

    To project shipments to the new-owner market, DOE estimated the new 
owners based on the residual shipments from the calculated replacement 
and new construction shipments compared to historical shipments over 
five years (2018-2022). DOE compared this with data from Decision 
Analysts' 2002 to 2022 American Home Comfort Study,\60\ 2023 BRG 
data,\61\ and AHRI's estimated shipments in 2000,\62\ which showed 
similar historical fractions of new owners. DOE assumed that the new-
owner fraction would be the 10-year average (2013-2022) in 2030 and 
then decrease to zero by the end of the analysis period (2059).
---------------------------------------------------------------------------

    \60\ Decision Analysts, 2002, 2004, 2006, 2008, 2010, 2013, 
2016, 2019, and 2022 American Home Comfort Study (Available at: 
www.decisionanalyst.com/Syndicated/HomeComfort/) (Last accessed Jun. 
1, 2023).
    \61\ BRG data (Available at: www.brgbuildingsolutions.com/) 
(Last accessed Jun. 1, 2023).
    \62\ AHRI (formerly GAMA), Furnace and Boiler Shipments data 
provided to DOE for Furnace and Boiler ANOPR (Jan. 23, 2002).
---------------------------------------------------------------------------

    Lennox commented that DOE likely overstates shipments for gas 
furnaces. Lennox commented that DOE currently has open rulemakings for 
furnaces (e.g., a NOPR for NWGs and a notice of TSD for oil, electric, 
and weatherized gas furnace energy conservation standards), the outcome 
of which will likely result in reduced market shares of certain 
products and elimination of others. Furthermore, Lennox commented that 
the market shares will likely be affected by the current efforts under 
the Biden administration to decarbonize space heating, and that states 
such as California and New York are implementing plans to completely 
electrify space heating as early as 2030. Lennox added that furnace 
costs are likely to change due to increased energy conservation 
standards and decarbonization efforts to electrify space heating 
(Lennox, No. 24 at p. 2-4) Lennox stated that DOE TSD projections are 
not likely to be indicative of future furnace shipments. (Lennox, No. 
24 at p. 8)
    Similarly, AHRI commented that DOE did not consider the impact of 
ongoing rulemakings and electrification policies in its analysis. AHRI 
commented that not accounting for these changes affects future shipment 
projections and the actual impact of a more stringent rule on national 
energy savings. (AHRI, No. 23 at p. 1) AHRI commented that the impact 
of State, county, and local policies should not be discounted in DOE's 
market projections because these policies impact nearly one fifth of 
the furnace fan market. AHRI provided examples of relevant policies in 
California, New York, Massachusetts, Maryland's Montgomery County, and 
New York City related to eliminating NOX emissions for space 
and water heating, transitioning from combustion fuels to electric heat 
pumps, reducing greenhouse gas emissions, building decarbonization, and 
restricting fossil fuel usage in new construction. AHRI further 
commented that these policies need to be accounted for in the shipment 
and impact analysis. (AHRI, No. 23 at p. 2)
    Morrison also commented that DOE is not projecting the ways 
decarbonization efforts currently underway across the country will 
impact future furnace shipments. (Morrison, No. 27 at p. 5)
    The CA IOUs commented that they expect furnace shipments to flatten 
or decline in the coming years considering local, State, and Federal 
efforts on carbonization. (CA IOUs, No. 21 at p. 5)
    For the consumer furnace NOPR, assumptions regarding future 
policies encouraging electrification of households were uncertain at 
that time, so such policies were not incorporated into the shipments 
projection. For the consumer furnace final rule, DOE accounted for the 
2022 update to Title 24 in California \63\ and also the decision of the 
California Public Utilities Commission to eliminate ratepayer subsidies 
for the extension of new gas lines beginning in July 2023. Together, 
these policies are expected to lead to the eventual phase-out of gas-
fired furnaces in new single-family homes in California. The California 
Air Resources Board has adopted a 2022 State Strategy for the State 
Implementation Plan that would effectively ban new gas furnaces 
beginning in 2030.\64\ However, because a final decision on this rule 
would not happen until 2025, DOE did not include

[[Page 69859]]

this latter policy in its analysis for the consumer furnace final rule.
---------------------------------------------------------------------------

    \63\ The 2022 update includes heat pumps as a performance 
standard baseline for water heating or space heating in single-
family homes, as well as space heating in multi-family homes. Under 
the California Code, builders will need to either include one high-
efficiency heat pump in new constructions or subject those buildings 
to more-stringent energy efficiency standards.
    \64\ California Air Resources Board, 2022 State Strategy for the 
State Implementation Plan. (Available at: ww2.arb.ca.gov/resources/documents/2022-state-strategy-state-implementation-plan-2022-state-sip-strategy) (Last accessed June 1, 2023).
---------------------------------------------------------------------------

    DOE understands that ongoing electrification policies at the 
Federal, State, and local levels are likely to encourage installation 
of heat pumps in some new homes and adoption of heat pumps in some 
homes that currently use gas-fired furnaces. However, there are many 
uncertainties about the timing and effects of these policies that make 
it difficult to fully account for their likely impact on gas-fired 
furnace market shares in the time frame for the analysis (i.e., 2030 
through 2059). Nonetheless, DOE has modified some of its projections to 
attempt to account for impacts that are most likely in the relevant 
time frame. The changes result in a decrease of gas-fired furnace 
shipments in the no-new-standards case compared to the consumer furnace 
NOPR analysis, with a corresponding decrease in estimated energy 
savings resulting from the standards. DOE acknowledges that 
electrification policies may result in a larger decrease in shipments 
of gas-fired furnaces than projected in the consumer furnace final 
rule, especially if stronger policies are adopted in coming years. 
However, this would occur in the no-new amended standards case and, 
thus, would only reduce the energy savings estimated in this rule. 
Given that DOE is tentatively determining that standards do not need to 
be amended, a decrease in shipments projected would not change that 
decision.
    AHRI commented that if DOE enacts the energy levels put forth in 
the consumer furnace July 2022 NOPR, these products will no longer be 
on the market by 2030. AHRI also commented that DOE should consider the 
consumers who are unable to replace their existing non-condensing 
product and will end up switching fuels and adopting a heat pump in its 
analysis. (AHRI, No. 23 at p. 2)
    DOE notes that this analysis only considers what has been finalized 
for consumer furnace standards. Once the consumer furnace standards are 
finalized, DOE will take the amended consumer furnace standards into 
account for future analysis. Given that DOE is tentatively determining 
that furnace fan standards do not need to be amended, potential amended 
consumer furnace standards would not change that decision at this time.
    Morrison commented that regarding shipments in the no-new-standards 
case, Figure 9.4.1 in the TSD fails to account for an echo demand 
reduction approximately 20 years out from the dip in 2010. (Morrison, 
No. 27 at p. 5)
    DOE updated the furnace shipments analysis to take into account a 
decrease in projected shipments around 2025-2040 due to the 2010 market 
dip. Given that DOE is tentatively determining that standards do not 
need to be amended, a decrease in shipments projected would not change 
that decision.

G. National Impact Analysis

    The NIA assesses the NES and the NPV from a national perspective of 
total consumer costs and savings that would be expected to result from 
new or amended standards at specific efficiency levels.\65\ 
(``Consumer'' in this context refers to consumers of the product being 
regulated.) DOE calculates the NES and NPV for the potential standard 
levels considered based on projections of annual product shipments, 
along with the annual energy consumption and total installed cost data 
from the energy use and LCC analyses. For the present analysis, DOE 
projected the energy savings, operating cost savings, product costs, 
and NPV of consumer benefits over the lifetime of consumer furnace fans 
sold from 2030 through 2059.
---------------------------------------------------------------------------

    \65\ The NIA accounts for impacts in the 50 states and 
Washington, DC.
---------------------------------------------------------------------------

    DOE evaluates the effects of new or amended standards by comparing 
a case without such standards with standards-case projections. The no-
new-standards case characterizes energy use and consumer costs for each 
product class in the absence of new or amended energy conservation 
standards. For this projection, DOE considers historical trends in 
efficiency and various forces that are likely to affect the mix of 
efficiencies over time. DOE compares the no-new-standards case with 
projections characterizing the market for each product class if DOE 
adopted new or amended standards at specific energy efficiency levels 
(i.e., the ELs or standards cases) for that class. For the standards 
cases, DOE considers how a given standard would likely affect the 
market shares of products with efficiencies greater than the standard.
    DOE uses a spreadsheet model to calculate the energy savings and 
the national consumer costs and savings from each EL. Interested 
parties can review DOE's analyses by changing various input quantities 
within the spreadsheet. The NIA spreadsheet model uses typical values 
(as opposed to probability distributions) as inputs.
    Table IV.22 summarizes the inputs and methods DOE used for the NIA 
analysis for the NOPD. Discussion of these inputs and methods follows 
the table. See chapter 10 of the PA TSD for details.

   Table IV.22--Summary of Inputs and Methods for the National Impact
                                Analysis
------------------------------------------------------------------------
              Inputs                               Method
------------------------------------------------------------------------
Shipments.........................  Annual shipments from shipments
                                     model.
Modeled Compliance Date of          2030.
 Standard.
Efficiency Trends.................  No-new-standards case based on
                                     historical shipment data and on
                                     current consumer furnace fans model
                                     availability by efficiency level
                                     (see chapter 8 of the PA TSD). Roll-
                                     up in the compliance year for
                                     standards cases.
Annual Energy Consumption per Unit  Annual weighted-average values are a
                                     function of shipments-weighted unit
                                     energy use consumption.
Total Installed Cost per Unit.....  Annual weighted-average values as a
                                     function of the efficiency
                                     distribution (see chapter 8 of the
                                     PA TSD).
Annual Energy Cost per Unit.......  Annual weighted-average values as a
                                     function of the annual energy
                                     consumption per unit and energy
                                     prices.
Repair and Maintenance Cost per     Annual values as a function of
 Unit.                               efficiency level (see chapter 8 of
                                     the PA TSD).
Energy Prices.....................  AEO2023 projections to 2050 and
                                     extrapolation thereafter.
Energy Site-to-Primary and FFC      A time-series conversion factor
 Conversion.                         based on AEO2023.
Discount Rate.....................  Three percent and seven percent.

[[Page 69860]]

 
Present Year......................  2023.
------------------------------------------------------------------------

1. Product Efficiency Trends
    A key component of the NIA is the trend in energy efficiency 
projected for the no-new-standards case and each of the standards 
cases. Section IV.E.8 of this document describes how DOE developed an 
energy efficiency distribution for the no-new-standards case (which 
yields a shipment-weighted average efficiency) for each of the 
considered product classes for the year of anticipated compliance with 
an amended or new standard.
    For the standards cases, DOE used a ``roll-up'' scenario to 
establish the shipment-weighted efficiency for the year that standards 
are assumed to become effective (2030). In this scenario, the market 
shares of products in the no-new-standards case that do not meet the 
standard under consideration would ``roll up'' to meet the new standard 
level, and the market share of products above the standard would remain 
unchanged. Taking this efficiency distribution as a starting point, DOE 
projected standards-case efficiencies after 2030 using similar 
assumptions regarding future efficiency improvements as in the no-new-
standards case.
    To project efficiencies for the no-new-standards case, DOE used 
historical shipment data and current consumer furnace fan model 
availability by efficiency level (see chapter 8 of the PA TSD).
2. National Energy Savings
    The NES analysis involves a comparison of national energy 
consumption of the considered products between each potential standards 
case (EL) and the case with no new or amended energy conservation 
standards. DOE calculated the national energy consumption by 
multiplying the number of units (stock) of each product (by vintage or 
age) by the unit energy consumption (also by vintage). DOE calculated 
annual NES based on the difference in national energy consumption for 
the no-new-standards case and for each higher efficiency standard case. 
DOE estimated energy consumption and savings based on site energy and 
converted the electricity consumption and savings to primary energy 
(i.e., the energy consumed by power plants to generate site 
electricity) using annual conversion factors derived from AEO2023. 
Cumulative energy savings are the sum of the NES for each year over the 
timeframe of the analysis.
    Use of higher-efficiency products is sometimes associated with a 
direct rebound effect, which refers to an increase in utilization of 
the product due to the increase in efficiency. A rebound effect reduces 
the energy savings attributable to a standard. Where appropriate, DOE 
accounts for the direct rebound effect when estimating the NES from 
potential standards. In the residential sector, in the NIA model for 
product classes with an improved PSC motor standard, DOE applied a 
rebound effect for those standards cases that require a BPM motor 
furnace fan. A rebound effect factor of 16% was determined by 
calculating the additional electricity use that is required from a 
doubling of the use of continuous fan circulation compared to the 
average use assumed in the energy use analysis.\66\ Although a lower 
value might be warranted, DOE preferred to be conservative and not risk 
understating the rebound effect. For commercial applications, DOE 
applied no rebound effect, a decision consistent with other recent 
energy conservation standards rulemakings.67 68 69
---------------------------------------------------------------------------

    \66\ DOE reviewed an evaluation report from Wisconsin that 
indicates that a considerable number of homeowners who purchase 
constant-airflow BPM furnaces significantly increase the frequency 
with which they operate their furnace fan subsequent to the 
installation of the constant-airflow BPM furnace. On average, this 
report indicates that there is a doubling in the amount of 
continuous fan circulation use. DOE assumed that this doubling was 
the same for all types of furnace fans that had a significant 
decrease in energy use in the continuous fan circulation mode. 
(Evaluation report available at: http://www.focusonenergy.com/sites/default/files/emcfurnaceimpactassessment_evaluationreport.pdf)
    \67\ DOE. Energy Conservation Program for Certain Industrial 
Equipment: Energy Conservation Standards for Small, Large, and Very 
Large Air-Cooled Commercial Package Air Conditioning and Heating 
Equipment and Commercial Warm Air Furnaces; Direct final rule. 81 FR 
2419 (Jan. 15, 2016) (Available at: www.regulations.gov/document/EERE-2013-BT-STD-0021-0055) (Last accessed Feb. 15, 2022).
    \68\ DOE. Energy Conservation Program: Energy Conservation 
Standards for Residential Boilers; Final rule. 81 FR 2319 (Jan. 15, 
2016) (Available at: www.regulations.gov/document/EERE-2012-BT-STD-0047-0078) (Last accessed Feb. 15, 2022).
    \69\ DOE. Energy Conservation Program: Energy Conservation 
Standards for Commercial Packaged Boilers; Final Rule. 85 FR 1592 
(Jan. 10, 2020) (Available at: www.regulations.gov/document/EERE-2013-BT-STD-0030-0099) (Last accessed Feb. 15, 2022).
---------------------------------------------------------------------------

    In 2011, in response to the recommendations of a committee on 
``Point-of-Use and Full-Fuel-Cycle Measurement Approaches to Energy 
Efficiency Standards'' appointed by the National Academy of Sciences, 
DOE announced its intention to use FFC measures of energy use and 
greenhouse gas and other emissions in the NIA and emissions analyses 
included in future energy conservation standards rulemakings. 76 FR 
51281 (Aug. 18, 2011). After evaluating the approaches discussed in the 
August 18, 2011 notice, DOE published a statement of amended policy in 
which DOE explained its determination that EIA's National Energy 
Modeling System (NEMS) is the most appropriate tool for its FFC 
analysis and its intention to use NEMS for that purpose. 77 FR 49701 
(Aug. 17, 2012). NEMS is a public domain, multi-sector, partial 
equilibrium model of the U.S. energy sector \70\ that EIA uses to 
prepare its AEO. The FFC factors incorporate losses in production, and 
delivery in the case of natural gas, (including fugitive emissions) and 
additional energy used to produce and deliver the various fuels used by 
power plants. The approach used for deriving FFC measures of energy use 
and emissions is described in appendix 10B of the PA TSD.
---------------------------------------------------------------------------

    \70\ For more information on NEMS, refer to The National Energy 
Modeling System: An Overview 2009, DOE/EIA-0581(2009), October 2009. 
Available at www.eia.gov/analysis/pdfpages/0581(2009)index.php (last 
accessed June 26, 2023).
---------------------------------------------------------------------------

3. Net Present Value Analysis
    The inputs for determining the NPV of the total costs and benefits 
experienced by consumers are (1) total annual installed cost, (2) total 
annual operating costs (energy costs and repair and maintenance costs), 
and (3) a discount factor to calculate the present value of costs and 
savings. DOE calculates net savings each year as the difference between 
the no-new-standards case and each standards case in terms of total 
savings in operating costs versus total increases in installed costs. 
DOE calculates operating cost savings over the lifetime of each product 
shipped during the projection period.
    The operating cost savings are energy cost savings, which are 
calculated using the estimated energy savings in each year and the 
projected price of the appropriate form of energy. To estimate

[[Page 69861]]

energy prices in future years, DOE multiplied the average regional 
energy prices by the projection of annual national-average residential 
energy price changes in the Reference case from AEO2023, which has an 
end year of 2050. To estimate price trends after 2050, DOE used the 
average annual rate of change in prices from 2020 through 2050.
    In calculating the NPV, DOE multiplies the net savings in future 
years by a discount factor to determine their present value. For this 
NOPD, DOE estimated the NPV of consumer benefits using both a 3-percent 
and a 7-percent real discount rate. DOE uses these discount rates in 
accordance with guidance provided by the Office of Management and 
Budget (``OMB'') to Federal agencies on the development of regulatory 
analysis.\71\ The discount rates for the determination of NPV are in 
contrast to the discount rates used in the LCC analysis, which are 
designed to reflect a consumer's perspective. The 7-percent real value 
is an estimate of the average before-tax rate of return to private 
capital in the U.S. economy. The 3-percent real value represents the 
``social rate of time preference,'' which is the rate at which society 
discounts future consumption flows to their present value.
---------------------------------------------------------------------------

    \71\ United States Office of Management and Budget, Circular A-
4: Regulatory Analysis (Sept. 17, 2003) Section E (Available at: 
obamawhitehouse.archives.gov/omb/circulars_a004_a-4/) (Last accessed 
May 31, 2023).
---------------------------------------------------------------------------

H. Further Considerations Related to Backward-Inclined Impellers

    Although DOE did not screen out backward-inclined impellers from 
further considerations in this analysis (for the reasons discussed in 
section IV.A.4.a), DOE is aware of several points of uncertainty 
related to the impacts of a potential standard that required the use of 
this technology. First, as discussed in section IV.B.1.c of this 
document, because there are only a small number of models on the market 
with backward-inclined impellers and several manufacturers expressed 
concerns about the implementation of this technology, DOE understands 
that there may be uncertainty related to whether this technology can be 
implemented across all input capacities and cabinet sizes. Similarly, 
as discussed in section IV.A.4.a of this document, manufacturers also 
raised concerns about the potential negative impacts on consumer 
utility because of increased noise in certain sizes of furnaces 
(although DOE is not aware of data on this subject). Additionally, the 
incorporation of backward-inclined impellers could require system 
changes to the furnace system that expand beyond the scope of the 
furnace fan. Manufacturers noted that adoption of backward-inclined 
impellers could necessitate system considerations to ensure reliability 
of heat exchanger performance, acceptable sound performance, and ease 
of installation. Manufacturers also raised concerns that constraints of 
backward-inclined impeller designs could impede the flexibility of 
installation configurations. For some fraction of the market, complete 
furnace redesign would be required to accommodate the backward-inclined 
impellers design option.
    Finally, as discussed in section IV.B.1.c of this document, DOE 
understands that there is uncertainty associated with the estimated 10 
percent reduction in FER for fans using a backward-inclined impeller as 
compared to models that include forward-inclined impellers. Uncertainty 
related to the results of the energy use analysis contributes 
uncertainty to all the conclusions of DOE's subsequent analyses, 
including the life-cycle cost and payback period analyses and the 
national impact analysis. As discussed in section V.C.1 of this 
document, DOE has considered these uncertainties in its ultimate 
decision of whether to propose amended standards for consumer furnace 
fans.

V. Analytical Results and Conclusions

    The following section addresses the results from DOE's analyses 
with respect to the considered energy conservation standards for 
consumer furnace fans. It addresses the ELs examined by DOE and the 
projected impacts of each of these levels. To estimate the impacts of 
amended standards for consumer furnace fans, DOE compared the no-new-
standards case to scenarios in which specific Candidate Standards 
Levels (``CSLs'') are implemented. CSL 1 analyzes a scenario in which 
standards corresponding to EL 1 are adopted for the NWO-NC, MH-NWG-NC, 
MH-NWG-C, and MH-NWO product classes and standards are not amended for 
the NWG-NC, NWG-C, WG-NC, NWEF/NWMB, and MH-EF/MB product classes. CSL 
2 analyzes a scenario in which standards are adopted corresponding to 
EL 1 for the NWG-NC, NWG-C, WG-NC, NWEF/NWMB, and MH-EF/MB product 
classes and as EL 2 for the NWO-NC, MH-NWG-NC, MH-NWG-C, and MH-NWO 
product classes. In other words, CSL 1 analyzes a scenario in which BPM 
motors are required for all product classes and CSL 2 analyzes a 
scenario in which BPM motors with backward-inclined impellers are 
required for all product classes, corresponding to the max-tech 
efficiency level for all product classes.

A. Economic Impacts on Individual Consumers

    DOE analyzed the cost effectiveness (i.e., the savings in operating 
costs throughout the estimated average life of consumer furnace fans 
compared to any increase in the price of, or in the initial charges 
for, or maintenance expenses of, the consumer furnace fans which are 
likely to result from the imposition of a standard at an EL by 
considering the LCC and PBP at each EL. These analyses are discussed in 
the following sections.
    In general, higher-efficiency products can affect consumers in two 
ways: (1) purchase price increases and (2) annual operating costs 
decrease. Inputs used for calculating the LCC and PBP include total 
installed costs (i.e., product price plus installation costs), and 
operating costs (i.e., annual energy use, energy prices, energy price 
trends, repair costs, and maintenance costs). The LCC calculation also 
uses product lifetime and a discount rate. Section IV.E of this NOPD 
provides detailed information on the LCC and PBP analyses.
    Table V.1 through Table V.18 show the average LCC and PBP results 
for the ELs considered for consumer furnace fans in this analysis.

[[Page 69862]]



                     Table V.1--Average LCC and PBP Results by Efficiency Level for Non-Weatherized, Non-Condensing Gas Furnace Fan
                                                                        [NWG-NC]
--------------------------------------------------------------------------------------------------------------------------------------------------------
                                                                   Average costs (2022$)
                                       ----------------------------------------------------------------------------   Simple payback    Average lifetime
           Efficiency level                                   First year's         Lifetime                           period (years)        (years)
                                          Installed cost     operating cost     operating cost          LCC
--------------------------------------------------------------------------------------------------------------------------------------------------------
0.....................................                403                 67              1,160              1,563  .................               20.9
1.....................................                495                 60              1,069              1,565               12.9               20.9
--------------------------------------------------------------------------------------------------------------------------------------------------------


Table V.2--LCC Savings Relative to the Base Case Efficiency Distribution
           for Non-Weatherized, Non-Condensing Gas Furnace Fan
                                [NWG-NC]
------------------------------------------------------------------------
                                                              Average
                                                             savings--
            Efficiency level                % Consumers      impacted
                                           with net cost     consumers
                                                              (2022$)
------------------------------------------------------------------------
0.......................................             0.0              NA
1.......................................            68.4             (1)
------------------------------------------------------------------------


                       Table V.3--Average LCC and PBP Results by Efficiency Level for Non-Weatherized, Condensing Gas Furnace Fan
                                                                         [NWG-C]
--------------------------------------------------------------------------------------------------------------------------------------------------------
                                                                   Average costs (2022$)
                                       ----------------------------------------------------------------------------   Simple payback    Average lifetime
           Efficiency level                                   First year's         Lifetime                           period (years)        (years)
                                          Installed cost     operating cost     operating cost          LCC
--------------------------------------------------------------------------------------------------------------------------------------------------------
0.....................................                420                 61              1,106              1,525  .................               21.9
1.....................................                501                 55              1,024              1,526               13.3               21.9
--------------------------------------------------------------------------------------------------------------------------------------------------------


Table V.4--LCC Savings Relative to the Base Case Efficiency Distribution
             for Non-Weatherized, Condensing Gas Furnace Fan
                                 [NWG-C]
------------------------------------------------------------------------
                                                              Average
                                                             savings--
            Efficiency level                % Consumers      impacted
                                           with net cost     consumers
                                                              (2022$)
------------------------------------------------------------------------
0.......................................             0.0              NA
1.......................................            70.7             (0)
------------------------------------------------------------------------


               Table V.5--Average LCC and PBP Results by Efficiency Level for Mobile Home Non-Weatherized, Non-Condensing Gas Furnace Fan
                                                                       [MH-NWG-NC]
--------------------------------------------------------------------------------------------------------------------------------------------------------
                                                                   Average costs (2022$)
                                       ----------------------------------------------------------------------------   Simple payback    Average lifetime
           Efficiency level                                   First year's         Lifetime                           period (years)        (years)
                                          Installed cost     operating cost     operating cost          LCC
--------------------------------------------------------------------------------------------------------------------------------------------------------
0.....................................                212                 54                884              1,096  .................               20.7
1.....................................                258                 35                589                847                2.3               20.7
2.....................................                332                 30                530                863                5.0               20.7
--------------------------------------------------------------------------------------------------------------------------------------------------------


[[Page 69863]]


Table V.6--LCC Savings Relative to the Base Case Efficiency Distribution
     for Mobile Home Non-Weatherized, Non-Condensing Gas Furnace Fan
                               [MH-NWG-NC]
------------------------------------------------------------------------
                                                              Average
                                                             savings--
            Efficiency level                % consumers      impacted
                                           with net cost     consumers
                                                              (2022$)
------------------------------------------------------------------------
0.......................................             0.0              NA
1.......................................             3.8             231
2.......................................            76.1               9
------------------------------------------------------------------------


                   Table V.7--Average LCC and PBP Results by Efficiency Level for Mobile Home Non-Weatherized, Condensing Gas Furnace
                                                                       [MH-NWG-C]
--------------------------------------------------------------------------------------------------------------------------------------------------------
                                                                   Average costs (2022$)
                                       ----------------------------------------------------------------------------   Simple payback    Average lifetime
           Efficiency level                                   First year's         Lifetime                           period (years)        (years)
                                          Installed cost     operating cost     operating cost          LCC
--------------------------------------------------------------------------------------------------------------------------------------------------------
0.....................................                238                 62              1,039              1,277  .................               21.5
1.....................................                300                 37                666                966                2.5               21.5
2.....................................                364                 34                631                995                4.6               21.5
--------------------------------------------------------------------------------------------------------------------------------------------------------


Table V.8--LCC Savings Relative to the Base Case Efficiency Distribution
         for Mobile Home Non-Weatherized, Condensing Gas Furnace
                               [MH-NWG-C]
------------------------------------------------------------------------
                                                              Average
                                                             savings--
            Efficiency level                % Consumers      impacted
                                           with net cost     consumers
                                                              (2022$)
------------------------------------------------------------------------
0.......................................             0.0              NA
1.......................................             1.5             292
2.......................................            82.1             (7)
------------------------------------------------------------------------


                     Table V.9--Average LCC and PBP Results by Efficiency Level for Mobile Home Electric Furnace/Modular Blower Fan
                                                                       [MH-EF/MB]
--------------------------------------------------------------------------------------------------------------------------------------------------------
                                                                   Average costs (2022$)
                                       ----------------------------------------------------------------------------   Simple payback    Average lifetime
           Efficiency level                                   First year's         Lifetime                           period (years)        (years)
                                          Installed cost     operating cost     operating cost          LCC
--------------------------------------------------------------------------------------------------------------------------------------------------------
0.....................................                255                 36                629                885  .................               20.7
1.....................................                315                 32                578                893               14.7               20.7
--------------------------------------------------------------------------------------------------------------------------------------------------------


      Table V.10--LCC Savings Relative to the Base Case Efficiency
    Distribution for Mobile Home Electric Furnace/Modular Blower Fan
                               [MH-EF/MB]
------------------------------------------------------------------------
                                                              Average
                                                             savings--
            Efficiency level                % Consumers      impacted
                                           with net cost     consumers
                                                              (2022$)
------------------------------------------------------------------------
0.......................................             0.0              NA
1.......................................            71.5             (8)
------------------------------------------------------------------------


[[Page 69864]]


                     Table V.11--Average LCC and PBP Results by Efficiency Level for Non-Weatherized, Non-Condensing Oil Furnace Fan
                                                                        [NWO-NC]
--------------------------------------------------------------------------------------------------------------------------------------------------------
                                                                   Average costs (2022$)
                                       ----------------------------------------------------------------------------   Simple payback    Average lifetime
           Efficiency level                                   First year's         Lifetime                           period (years)        (years)
                                          Installed cost     operating cost     operating cost          LCC
--------------------------------------------------------------------------------------------------------------------------------------------------------
0.....................................                568                151              2,601              3,169  .................               22.2
1.....................................                654                110              1,940              2,594                2.1               22.2
2.....................................                765                103              1,840              2,605                4.1               22.2
--------------------------------------------------------------------------------------------------------------------------------------------------------


      Table V.12--LCC Savings Relative to the Base Case Efficiency
    Distribution for Non-Weatherized, Non-Condensing Oil Furnace Fan
                                [NWO-NC]
------------------------------------------------------------------------
                                                              Average
                                                             savings--
            Efficiency level                % Consumers      impacted
                                           with net cost     consumers
                                                              (2022$)
------------------------------------------------------------------------
0.......................................             0.0              NA
1.......................................             4.4             618
2.......................................            52.2             274
------------------------------------------------------------------------


                       Table V.13--Average LCC and PBP Results by Efficiency Level for Weatherized Non-Condensing Gas Furnace Fan
                                                                         [WG-NC]
--------------------------------------------------------------------------------------------------------------------------------------------------------
                                                                   Average costs (2022$)
                                       ----------------------------------------------------------------------------   Simple payback    Average lifetime
           Efficiency level                                   First year's         Lifetime                           period (years)        (years)
                                          Installed cost     operating cost     operating cost          LCC
--------------------------------------------------------------------------------------------------------------------------------------------------------
0.....................................                385                 81              1,322              1,706  .................               20.6
1.....................................                478                 71              1,188              1,666                9.1               20.6
--------------------------------------------------------------------------------------------------------------------------------------------------------


      Table V.14--LCC Savings Relative to the Base Case Efficiency
       Distribution for Weatherized Non-Condensing Gas Furnace Fan
                                 [WG-NC]
------------------------------------------------------------------------
                                                              Average
                                                             savings--
            Efficiency level                % Consumers      impacted
                                           with net cost     consumers
                                                              (2022$)
------------------------------------------------------------------------
0.......................................             0.0              NA
1.......................................            54.9              40
------------------------------------------------------------------------


                             Table V.15--Average LCC and PBP Results by Efficiency Level for Electric Furnace/Modular Blower
                                                                         [EF/MB]
--------------------------------------------------------------------------------------------------------------------------------------------------------
                                                                   Average costs (2022$)
                                       ----------------------------------------------------------------------------   Simple payback    Average lifetime
           Efficiency level                                   First year's         Lifetime                           period (years)        (years)
                                          Installed cost     operating cost     operating cost          LCC
--------------------------------------------------------------------------------------------------------------------------------------------------------
0.....................................                305                 43                726              1,031  .................               20.7
1.....................................                371                 39                673              1,045               16.0               20.7
--------------------------------------------------------------------------------------------------------------------------------------------------------


[[Page 69865]]


      Table V.16--LCC Savings Relative to the Base Case Efficiency
            Distribution for Electric Furnace/Modular Blower
                                 [EF/MB]
------------------------------------------------------------------------
                                                              Average
                                                             savings--
            Efficiency level                % Consumers      impacted
                                           with net cost     consumers
                                                              (2022$)
------------------------------------------------------------------------
0.......................................             0.0              NA
1.......................................            77.5            (14)
------------------------------------------------------------------------


               Table V.17--Average LCC and PBP Results by Efficiency Level for Mobile Home Non-Weatherized, Non-Condensing Oil Furnace Fan
                                                                       [MH-NWO-NC]
--------------------------------------------------------------------------------------------------------------------------------------------------------
                                                                   Average costs (2022$)
                                       ----------------------------------------------------------------------------   Simple payback    Average lifetime
           Efficiency level                                   First year's         Lifetime                           period (years)        (years)
                                          Installed cost     operating cost     operating cost          LCC
--------------------------------------------------------------------------------------------------------------------------------------------------------
0.....................................                491                 88              1,539              2,030  .................               22.5
1.....................................                541                 66              1,187              1,728                2.3               22.5
2.....................................                624                 61              1,105              1,729                5.0               22.5
--------------------------------------------------------------------------------------------------------------------------------------------------------


      Table V.18--LCC Savings Relative to the Base Case Efficiency
Distribution for Mobile Home Non-Weatherized, Non-Condensing Oil Furnace
                                   Fan
                               [MH-NWO-NC]
------------------------------------------------------------------------
                                                              Average
                                                             savings--
            Efficiency level                % Consumers      impacted
                                           with net cost     consumers
                                                              (2022$)
------------------------------------------------------------------------
0.......................................             0.0              NA
1.......................................            21.0             308
2.......................................            54.7             276
------------------------------------------------------------------------

B. National Impact Analysis

    This section presents DOE's estimates of the NES and the NPV of 
consumer benefits that would result from each of the ELs considered as 
potential amended standards.
1. Significance of Energy Savings
    To estimate the energy savings attributable to potential amended 
standards for consumer furnace fans, DOE compared their energy 
consumption under the no-new-standards case to their anticipated energy 
consumption under each CSL.
    The savings are measured over the entire lifetime of products 
purchased in the 30-year period that begins in the year of anticipated 
compliance with amended standards (2030-2059). Table V.20 presents 
DOE's projections of the NES for each CSL considered for consumer 
furnace fans. The savings were calculated using the approach described 
in section IV.G of this document.

   Table V.20--Cumulative National Energy Savings for Consumer Furnace
                       Fans; 30 Years of Shipments
                               [2030-2059]
------------------------------------------------------------------------
                                             Candidate standards level
                                         -------------------------------
                                                 1               2
------------------------------------------------------------------------
                                                       quads
                                         -------------------------------
Primary energy..........................           0.013           1.355
FFC energy..............................           0.013           1.374
------------------------------------------------------------------------


[[Page 69866]]

    OMB Circular A-4 \72\ requires agencies to present analytical 
results, including separate schedules of the monetized benefits and 
costs that show the type and timing of benefits and costs. Circular A-4 
also directs agencies to consider the variability of key elements 
underlying the estimates of benefits and costs. For this proposed 
determination, DOE undertook a sensitivity analysis using 9 years, 
rather than 30 years, of product shipments. The choice of a 9-year 
period is a proxy for the timeline in EPCA for the review of certain 
energy conservation standards and potential revision of and compliance 
with such revised standards.73 74 The review timeframe 
established in EPCA is generally not synchronized with the product 
lifetime, product manufacturing cycles, or other factors specific to 
consumer furnace fans. Thus, such results are presented for 
informational purposes only and are not indicative of any change in 
DOE's analytical methodology. The NES sensitivity analysis results 
based on a 9-year analytical period are presented in Table V.21. The 
impacts are counted over the lifetime of consumer furnace fans 
purchased in 2030-2038.
---------------------------------------------------------------------------

    \72\ U.S. Office of Management and Budget. Circular A-4: 
Regulatory Analysis. September 17, 2003. Available at 
obamawhitehouse.archives.gov/omb/circulars_a004_a-4/ (Last accessed 
Sept. 9, 2021).
    \73\ U.S. Office of Management and Budget. Circular A-4: 
Regulatory Analysis. September 17, 2003. Available at 
obamawhitehouse.archives.gov/omb/circulars_a004_a-4/ (last accessed 
August 29, 2023).
    \74\ Section 325(m) of EPCA requires DOE to review its standards 
at least once every 6 years, and requires, for certain products, a 
3-year period after any new standard is promulgated before 
compliance is required, except that in no case may any new standards 
be required within 6 years of the compliance date of the previous 
standards. If DOE makes a determination that amended standards are 
not needed, it must conduct a subsequent review within three years 
following such a determination. As DOE is evaluating the need to 
amend the standards, the sensitivity analysis is based on the review 
timeframe associated with amended standards. While adding a 6-year 
review to the 3-year compliance period adds up to 9 years, DOE notes 
that it may undertake reviews at any time within the 6-year period 
and that the 3-year compliance date may yield to the 6-year 
backstop. A 9-year analysis period may not be appropriate given the 
variability that occurs in the timing of standards reviews and the 
fact that for some products, the compliance period is 5 years rather 
than 3 years.

   Table V.21--Cumulative National Energy Savings for Consumer Furnace
                       Fans; 9 Years of Shipments
                               [2030-2038]
------------------------------------------------------------------------
                                                   Candidate standards
                                                          level
                                               -------------------------
                                                     1            2
------------------------------------------------------------------------
                                                         (quads)
                                               -------------------------
Primary energy................................        0.005        0.376
FFC energy....................................        0.005        0.381
------------------------------------------------------------------------

2. Net Present Value of Consumer Costs and Benefits
    DOE estimated the cumulative NPV of the total costs and savings for 
consumers that would result from the CSLs considered for consumer 
furnace fans. In accordance with OMB's guidelines on regulatory 
analysis,\75\ DOE calculated NPV using both a 7-percent and a 3-percent 
real discount rate. Table V.22 shows the consumer NPV results with 
impacts counted over the lifetime of products purchased in 2030-2059.
---------------------------------------------------------------------------

    \75\ U.S. Office of Management and Budget. Circular A-4: 
Regulatory Analysis. September 17, 2003. Available at 
obamawhitehouse.archives.gov/omb/circulars_a004_a-4/ (Last accessed 
Sept. 9, 2021).

    Table V.22--Cumulative Net Present Value of Consumer Benefits for
              Consumer Furnace Fans; 30 Years of Shipments
                               [2030-2059]
------------------------------------------------------------------------
                                                   Candidate standards
                                                          level
                 Discount rate                 -------------------------
                                                     1            2
------------------------------------------------------------------------
                                                     (billion 2022$)
                                               -------------------------
3 percent.....................................        0.112        1.821
7 percent.....................................        0.042      (0.150)
------------------------------------------------------------------------
Note: Number in parentheses means negative.

    The NPV results based on the aforementioned 9-year analytical 
period are presented in Table V.23. The impacts are counted over the 
lifetime of products purchased in 2030-2038. As mentioned previously, 
such results are presented for informational purposes only and are not 
indicative of any change in DOE's analytical methodology or decision 
criteria.

    Table V.23--Cumulative Net Present Value of Consumer Benefits for
               Consumer Furnace Fans; 9 Years of Shipments
                               [2030-2038]
------------------------------------------------------------------------
                                                   Candidate standards
                                                          level
                 Discount rate                 -------------------------
                                                     1            2
------------------------------------------------------------------------
                                                     (billion 2022$)
                                               -------------------------
3 percent.....................................        0.056        0.716
7 percent.....................................        0.026      (0.071)
------------------------------------------------------------------------
Note: Number in parentheses means negative.

C. Proposed Determination

    EPCA mandates that DOE consider whether amended energy conservation 
standards for consumer furnace fans would be technologically feasible. 
(42 U.S.C. 6295(m)(1)(A) and 42 U.S.C. 6295(n)(2)(B)) EPCA also 
requires DOE to consider whether energy conservation standards for 
consumer furnace fans would be cost effective through an evaluation of 
the savings in operating costs throughout the estimated average life of 
the covered product compared to any increase in the price of, or in the 
initial charges for, or maintenance expenses of, the covered products 
which are likely to result from the imposition of an amended standard. 
(42 U.S.C. 6295(m)(1)(A), 42 U.S.C. 6295(n)(2)(C), and 42 U.S.C. 
6295(o)(2)(B)(i)(II)) Finally, EPCA mandates that DOE consider whether 
amended energy conservation standards for consumer furnace fans would 
result in significant conservation of energy. (42 U.S.C. 6295(m)(1)(A) 
and 42 U.S.C. 6295(n)(2)(A))
    DOE conducted an LCC analysis to estimate the net costs/benefits to 
users from increased efficiency in the considered consumer furnace 
fans, the results of which are shown in Table V.1. DOE then aggregated 
the results from the LCC analysis to estimate the NPV of the total 
costs and benefits experienced by the Nation. (See results in Table V.4 
and Table V.5.) As noted, the inputs for determining the NPV are (1) 
total annual installed cost, (2) total annual operating costs (energy 
costs and repair and maintenance costs), and (3) a discount factor to 
calculate the present value of costs and savings.
    To estimate the energy savings attributable to potential amended 
standards for consumer furnace fans, DOE compared their energy 
consumption under the no-new-standards case to their anticipated energy 
consumption under each potential standard level. The savings are 
measured over the entire lifetime of

[[Page 69867]]

products purchased in the 30-year period that begins in the year of 
anticipated compliance with amended standards (2030-2059). The results 
of this analysis are shown in Table V.20 and Table V.21.
    Because an analysis of potential cost effectiveness and energy 
savings first requires an evaluation of the relevant technology, DOE 
typically first discusses the technological feasibility of amended 
standards. DOE then typically addresses the cost effectiveness and 
energy savings associated with potential amended standards. For the 
current analysis, DOE reviewed the impacts of amended standards 
corresponding to the implementation of the two design options analyzed 
in this rule (i.e., BPM motor with forward-curved impellers and BPM 
motor with backward inclined impellers, as discussed in section IV.B of 
this document) separately. For each design option, DOE considered the 
technological feasibility, cost-effectiveness, and significance of 
energy savings.
1. BPM Motor With Backward-Inclined Impellers
    BPM motors with backward-inclined impellers are included in the 
current analysis as the max-tech design option for all furnace fan 
product classes. In other words, they are analyzed as EL 1 for the NWG-
NC, NWG-C, WG-NC, NWEF/NWMB, and MH-EF/MB product classes and as EL 2 
for the NWO-NC, MH-NWG-NC, MH-NWG-C, and MH-NWO product classes. As 
discussed in section IV.A.4 of this document, DOE is aware of BPM 
motors with backward-inclined impellers being used in commercially 
available consumer furnace fans and therefore this technology is 
technologically feasible.
    As seen in Table V.20, DOE estimates that amended standards for 
consumer furnace fans would result in energy savings of 1.374 quads at 
max tech levels over a 30-year analysis period (2030-2059). However, as 
seen in Table V.1 through Table V.18 and Table V.22, these efficiency 
levels result in net life-cycle costs for the majority of consumers and 
negative net present value at a 7-percent discount rate. Therefore, DOE 
finds that the max-tech ELs (which would require the use of backward-
inclined impellers used with BPM motors) are not cost effective.
    Additionally, as discussed in section IV.H of this document, there 
is a significant amount of uncertainty associated technical feasibility 
of backward-inclined impellers. In particular, DOE has concerns about 
the feasibility of implementing backward-inclined impellers across all 
input capacities and cabinet sizes and the unavailability of certain 
furnace product sizes and uncertainty related to its estimates of the 
energy reduction associated with backward-inclined impellers as opposed 
to forward-curved impellers.
2. BPM Motor With Forward-Curved Impellers
    Use of BPM motors with forward-curved impellers (which is the type 
of impeller used in the vast majority of consumer furnace fans on the 
market today) are included in the current analysis as the design option 
analyzed in CSL 1. For these product classes, the current standards can 
be met using less-efficient PSC motors, so replacing the motor with a 
BPM motor can improve the efficiency of the furnace fan. BPM motors are 
widely used in commercially available consumer furnace fans and 
therefore are technologically feasible.
    As seen in Table V.22, CSL 1 results in positive NPV at the 3-
percent and 7-percent discount rates. And, as seen in Table V.20, DOE 
estimates that amended standards for consumer furnace fans would result 
in energy savings of 0.013 quads at CSL 1 over a 30-year analysis 
period (2030-2059). However, as discussed in section IV.F, shipments in 
the affected product classes have declined over the past 20 years and 
could decline faster than current shipment projections, which may lead 
to reductions in energy savings from amended standards.
    Given the small role of NWO-NC, MH-NWG-NC, MH-NWG-C, and MH-NWO in 
the overall furnace market and the low sales relative to the consumer 
boiler and consumer water heater markets, manufacturers may de-
prioritize furnace fan updates for these product classes. Depending on 
how companies prioritize resources, there could be reduced availability 
of NWO-NC, MH-NWG-NC, and MH-NWO products in the marketplace after 
2030. Additionally, there is a potential risk that some manufacturers 
would choose to exit these markets rather than redesign affected 
products given the low shipment volumes, lack of anticipated growth, 
limited potential for cost recovery, and need to prioritize technical 
resources. In particular, the loss of a few manufacturers in the NWO-NC 
market could lead to changes in the competition and shifts toward the 
market becoming highly concentrated.
    As discussed previously, any amended standards for furnace fans 
would be required to comply with the economic justification and other 
requirements of 42 U.S.C. 6295(o). Based on the declining shipments of 
the affected product classes and uncertainty over whether manufacturers 
will choose to remain in a shrinking market, DOE has tentatively 
determined that it is unable to conclude that amended standards for 
furnace fans would be economically justified.
3. Summary
    As discussed previously, a determination that amended standards are 
not needed must be based on consideration of whether amended standards 
will result in significant conservation of energy, are technologically 
feasible, and are cost effective. (42 U.S.C. 6295(m)(1)(A) and 42 
U.S.C. 6295(n)(2)) Additionally, DOE can only propose an amended 
standard if it is, among other things, economically justified. (42 
U.S.C. 6295(m)(1)(B); 42 U.S.C. 6295(o)(2)(A)) With respect to the 
candidate standard level representing the max-tech design option, BPM 
motors with backward-inclined impellers, DOE has tentatively determined 
that an amended standard at this level would not be cost-effective. 
And, for the candidate standard level representing BPM motors with 
forward-curved impellers, DOE has tentatively determined that it is 
unable to conclude that an amended standard at this level would be 
economically justified. Therefore, DOE has tentatively determined that 
energy conservation standards for consumer furnace fans do not need to 
be amended at this time. DOE will consider all comments received on 
this proposed determination in issuing any final determination.

VI. Procedural Issues and Regulatory Review

A. Review Under Executive Orders 12866, 13563, and 14094

    Executive Order (``E.O.'') 12866, ``Regulatory Planning and 
Review,'' as supplemented and reaffirmed by E.O. 13563, ``Improving 
Regulation and Regulatory Review,'' 76 FR 3821 (Jan. 21, 2011), and 
amended by E.O. 14094, ``Modernizing Regulatory Review,'' 88 FR 21879 
(April 11, 2023), requires agencies, to the extent permitted by law, to 
(1) propose or adopt a regulation only upon a reasoned determination 
that its benefits justify its costs (recognizing that some benefits and 
costs are difficult to quantify); (2) tailor regulations to impose the 
least burden on society, consistent with obtaining regulatory 
objectives, taking into account, among other things, and to the extent 
practicable, the costs of cumulative regulations; (3) select, in 
choosing among alternative regulatory

[[Page 69868]]

approaches, those approaches that maximize net benefits (including 
potential economic, environmental, public health and safety, and other 
advantages; distributive impacts; and equity); (4) to the extent 
feasible, specify performance objectives, rather than specifying the 
behavior or manner of compliance that regulated entities must adopt; 
and (5) identify and assess available alternatives to direct 
regulation, including providing economic incentives to encourage the 
desired behavior, such as user fees or marketable permits, or providing 
information upon which choices can be made by the public. DOE 
emphasizes as well that E.O. 13563 requires agencies to use the best 
available techniques to quantify anticipated present and future 
benefits and costs as accurately as possible. In its guidance, the 
Office of Information and Regulatory Affairs (``OIRA'') in the Office 
of Management and Budget (``OMB'') has emphasized that such techniques 
may include identifying changing future compliance costs that might 
result from technological innovation or anticipated behavioral changes. 
For the reasons stated in the preamble, this proposed regulatory action 
is consistent with these principles.
    Section 6(a) of E.O. 12866 also requires agencies to submit 
``significant regulatory actions'' to OIRA for review. OIRA has 
determined that this proposed regulatory action does not constitute a 
``significant regulatory action'' within the scope of section 3(f)(1) 
of E.O. 12866. Accordingly, this action was not submitted to OIRA for 
review under E.O. 12866.

B. Review Under the Regulatory Flexibility Act

    The Regulatory Flexibility Act (5 U.S.C. 601 et seq.) requires 
preparation of an initial regulatory flexibility analysis (``IRFA'') 
for any rule that by law must be proposed for public comment, unless 
the agency certifies that the rule, if promulgated, will not have a 
significant economic impact on a substantial number of small entities. 
As required by E.O. 13272, ``Proper Consideration of Small Entities in 
Agency Rulemaking,'' 67 FR 53461 (Aug. 16, 2002), DOE published 
procedures and policies on February 19, 2003, to ensure that the 
potential impacts of its rules on small entities are properly 
considered during the proposed rulemaking process. 68 FR 7990. DOE has 
made its procedures and policies available on the Office of the General 
Counsel's website (www.energy.gov/gc/office-general-counsel).
    DOE reviewed this proposed determination under the provisions of 
the Regulatory Flexibility Act and the policies and procedures 
published on February 19, 2003. Because DOE is proposing not to amend 
standards for consumer furnace fans, if adopted, the determination 
would not amend any energy conservation standards. On the basis of the 
foregoing, DOE certifies that the proposed determination, if adopted, 
would have no significant economic impact on a substantial number of 
small entities. Accordingly, DOE has not prepared an IRFA for this 
proposed determination. DOE will transmit this certification and 
supporting statement of factual basis to the Chief Counsel for Advocacy 
of the Small Business Administration for review under 5 U.S.C. 605(b).

C. Review Under the Paperwork Reduction Act

    This proposed determination, which proposes to determine that 
amended energy conservation standards for consumer furnace fans are 
unneeded under the applicable statutory criteria, would impose no new 
informational or recordkeeping requirements. Accordingly, OMB clearance 
is not required under the Paperwork Reduction Act. (44 U.S.C. 3501 et 
seq.)

D. Review Under the National Environmental Policy Act of 1969

    DOE is analyzing this proposed action in accordance with the 
National Environmental Policy Act of 1969 (``NEPA'') and DOE's NEPA 
implementing regulations (10 CFR part 1021). DOE's regulations include 
a categorical exclusion for actions which are interpretations or 
rulings with respect to existing regulations. 10 CFR part 1021, subpart 
D, appendix A4. DOE anticipates that this action qualifies for 
categorical exclusion A4 because it is an interpretation or ruling in 
regards to an existing regulation and otherwise meets the requirements 
for application of a categorical exclusion. See 10 CFR 1021.410. DOE 
will complete its NEPA review before issuing the final action.

E. Review Under Executive Order 13132

    E.O. 13132, ``Federalism,'' 64 FR 43255 (Aug. 10, 1999), imposes 
certain requirements on Federal agencies formulating and implementing 
policies or regulations that preempt State law or that have federalism 
implications. The Executive order requires agencies to examine the 
constitutional and statutory authority supporting any action that would 
limit the policymaking discretion of the States and to carefully assess 
the necessity for such actions. The Executive order also requires 
agencies to have an accountable process to ensure meaningful and timely 
input by State and local officials in the development of regulatory 
policies that have federalism implications. On March 14, 2000, DOE 
published a statement of policy describing the intergovernmental 
consultation process it will follow in the development of such 
regulations. 65 FR 13735. DOE has examined this proposed determination 
and has tentatively determined that it would not have a substantial 
direct effect on the States, on the relationship between the national 
government and the States, or on the distribution of power and 
responsibilities among the various levels of government. EPCA governs 
and prescribes Federal preemption of State regulations as to energy 
conservation for the products that are the subject of this proposed 
rule. States can petition DOE for exemption from such preemption to the 
extent, and based on criteria, set forth in EPCA. (42 U.S.C. 6297) 
Therefore, no further action is required by E.O. 13132.

F. Review Under Executive Order 12988

    With respect to the review of existing regulations and the 
promulgation of new regulations, section 3(a) of E.O. 12988, ``Civil 
Justice Reform,'' imposes on Federal agencies the general duty to 
adhere to the following requirements: (1) eliminate drafting errors and 
ambiguity, (2) write regulations to minimize litigation, (3) provide a 
clear legal standard for affected conduct rather than a general 
standard, and (4) promote simplification and burden reduction. 61 FR 
4729 (Feb. 7, 1996). Regarding the review required by section 3(a), 
section 3(b) of E.O. 12988 specifically requires that Executive 
agencies make every reasonable effort to ensure that the regulation: 
(1) clearly specifies the preemptive effect, if any, (2) clearly 
specifies any effect on existing Federal law or regulation, (3) 
provides a clear legal standard for affected conduct while promoting 
simplification and burden reduction, (4) specifies the retroactive 
effect, if any, (5) adequately defines key terms, and (6) addresses 
other important issues affecting clarity and general draftsmanship 
under any guidelines issued by the Attorney General. Section 3(c) of 
Executive Order 12988 requires Executive agencies to review regulations 
in light of applicable standards in section 3(a) and section 3(b) to 
determine whether they are met or it is unreasonable to meet one or 
more of them. DOE has completed the required review and determined 
that, to the extent permitted by law, this proposed

[[Page 69869]]

determination meets the relevant standards of E.O. 12988.

G. Review Under the Unfunded Mandates Reform Act of 1995

    Title II of the Unfunded Mandates Reform Act of 1995 (``UMRA'') 
requires each Federal agency to assess the effects of Federal 
regulatory actions on State, local, and Tribal governments and the 
private sector. Public Law 104-4, sec. 201 (codified at 2 U.S.C. 1531). 
For a proposed regulatory action likely to result in a rule that may 
cause the expenditure by State, local, and Tribal governments, in the 
aggregate, or by the private sector of $100 million or more in any one 
year (adjusted annually for inflation), section 202 of UMRA requires a 
Federal agency to publish a written statement that estimates the 
resulting costs, benefits, and other effects on the national economy. 
(2 U.S.C. 1532(a), (b)) The UMRA also requires a Federal agency to 
develop an effective process to permit timely input by elected officers 
of State, local, and Tribal governments on a proposed ``significant 
intergovernmental mandate,'' and requires an agency plan for giving 
notice and opportunity for timely input to potentially affected small 
governments before establishing any requirements that might 
significantly or uniquely affect them. On March 18, 1997, DOE published 
a statement of policy on its process for intergovernmental consultation 
under UMRA. 62 FR 12820. DOE's policy statement is also available at 
energy.gov/sites/prod/files/gcprod/documents/umra_97.pdf.
    DOE examined this proposed determination according to UMRA and its 
statement of policy and determined that the proposed determination does 
not contain a Federal intergovernmental mandate, nor is it expected to 
require expenditures of $100 million or more in any one year by State, 
local, and Tribal governments, in the aggregate, or by the private 
sector. As a result, the analytical requirements of UMRA do not apply.

H. Review Under the Treasury and General Government Appropriations Act, 
1999

    Section 654 of the Treasury and General Government Appropriations 
Act, 1999 (Pub. L. 105-277) requires Federal agencies to issue a Family 
Policymaking Assessment for any rule that may affect family well-being. 
This proposed determination would not have any impact on the autonomy 
or integrity of the family as an institution. Accordingly, DOE has 
concluded that it is not necessary to prepare a Family Policymaking 
Assessment.

I. Review Under Executive Order 12630

    Pursuant to E.O. 12630, ``Governmental Actions and Interference 
with Constitutionally Protected Property Rights,'' 53 FR 8859 (Mar. 15, 
1988), DOE has determined that this proposed determination would not 
result in any takings that might require compensation under the Fifth 
Amendment to the U.S. Constitution.

J. Review Under the Treasury and General Government Appropriations Act, 
2001

    Section 515 of the Treasury and General Government Appropriations 
Act, 2001 (44 U.S.C. 3516 note) provides for Federal agencies to review 
most disseminations of information to the public under information 
quality guidelines established by each agency pursuant to general 
guidelines issued by OMB. OMB's guidelines were published at 67 FR 8452 
(Feb. 22, 2002), and DOE's guidelines were published at 67 FR 62446 
(Oct. 7, 2002). Pursuant to OMB Memorandum M-19-15, Improving 
Implementation of the Information Quality Act (April 24, 2019), DOE 
published updated guidelines which are available at www.energy.gov/sites/prod/files/2019/12/f70/DOE%20Final%20Updated%20IQA%20Guidelines%20Dec%202019.pdf. DOE has 
reviewed this NOPD under the OMB and DOE guidelines and has concluded 
that it is consistent with applicable policies in those guidelines.

K. Review Under Executive Order 13211

    E.O. 13211, ``Actions Concerning Regulations That Significantly 
Affect Energy Supply, Distribution, or Use,'' 66 FR 28355 (May 22, 
2001), requires Federal agencies to prepare and submit to the Office of 
Information and Regulatory Affairs (``OIRA'') at OMB, a Statement of 
Energy Effects for any proposed significant energy action. A 
``significant energy action'' is defined as any action by an agency 
that promulgates or is expected to lead to promulgation of a final 
rule, and that (1) is a significant regulatory action under Executive 
Order 12866, or any successor Executive Order; and (2) is likely to 
have a significant adverse effect on the supply, distribution, or use 
of energy, or (3) is designated by the Administrator of OIRA as a 
significant energy action. For any proposed significant energy action, 
the agency must give a detailed statement of any adverse effects on 
energy supply, distribution, or use should the proposal be implemented, 
and of reasonable alternatives to the action and their expected 
benefits on energy supply, distribution, and use.
    This proposed determination, which does not propose to amend energy 
conservation standards for consumer furnace fans, is not a significant 
regulatory action under Executive Order 12866. Moreover, it would not 
have a significant adverse effect on the supply, distribution, or use 
of energy, nor has it been designated as such by the Administrator at 
OIRA. Accordingly, DOE has not prepared a Statement of Energy Effects.

L. Review Under the Information Quality Bulletin for Peer Review

    On December 16, 2004, OMB, in consultation with the Office of 
Science and Technology Policy (``OSTP''), issued its Final Information 
Quality Bulletin for Peer Review (``the Bulletin''). 70 FR 2664 (Jan. 
14, 2005). The Bulletin establishes that certain scientific information 
shall be peer reviewed by qualified specialists before it is 
disseminated by the Federal Government, including influential 
scientific information related to agency regulatory actions. The 
purpose of the bulletin is to enhance the quality and credibility of 
the Government's scientific information. Under the Bulletin, the energy 
conservation standards rulemaking analyses are ``influential scientific 
information,'' which the Bulletin defines as ``scientific information 
the agency reasonably can determine will have, or does have, a clear 
and substantial impact on important public policies or private sector 
decisions.'' Id. at 70 FR 2667.
    In response to OMB's Bulletin, DOE conducted formal peer reviews of 
the energy conservation standards development process and the analyses 
that are typically used and has prepared a Peer Review report 
pertaining to the energy conservation standards rulemaking 
analyses.\76\ Generation of this report involved a rigorous, formal, 
and documented evaluation using objective criteria and qualified and 
independent reviewers to make a judgment as to the technical/
scientific/business merit, the actual or anticipated results, and the 
productivity and management effectiveness of programs and/or projects. 
Because available data, models, and technological understanding have 
changed since 2007, DOE has engaged with the National Academy of 
Sciences to review DOE's analytical methodologies to ascertain

[[Page 69870]]

whether modifications are needed to improve the Department's analyses. 
DOE is in the process of evaluating the resulting report.\77\
---------------------------------------------------------------------------

    \76\ ``Energy Conservation Standards Rulemaking Peer Review 
Report.'' 2007. Available at energy.gov/eere/buildings/downloads/energy-conservation-standards-rulemaking-peer-review-report-0 (last 
accessed June 26, 2023).
    \77\ The report is available at www.nationalacademies.org/our-work/review-of-methods-for-setting-building-and-equipment-performance-standards.
_____________________________________-

VII. Public Participation

A. Participation in the Webinar

    DOE will hold a public webinar upon receiving a request by the 
deadline identified in the DATES section at the beginning of this 
proposed determination. Interested persons may submit their request for 
the public webinar to the Appliance and Equipment Standards Program at 
[email protected]. If a public webinar is 
requested, DOE will release webinar registration information, 
participant instructions, and information about the capabilities 
available to webinar participants on DOE's website: 
www1.eere.energy.gov/buildings/appliance_standards/standards.aspx?productid=14. Participants are responsible for ensuring 
their systems are compatible with the webinar software.

B. Submission of Comments

    DOE will accept comments, data, and information regarding this 
proposed determination no later than the date provided in the DATES 
section at the beginning of this proposed rule. Interested parties may 
submit comments, data, and other information using any of the methods 
described in the ADDRESSES section at the beginning of this document.
    Submitting comments via www.regulations.gov. The 
www.regulations.gov web page will require you to provide your name and 
contact information. Your contact information will be viewable to DOE 
Building Technologies staff only. Your contact information will not be 
publicly viewable except for your first and last names, organization 
name (if any), and submitter representative name (if any). If your 
comment is not processed properly because of technical difficulties, 
DOE will use this information to contact you. If DOE cannot read your 
comment due to technical difficulties and cannot contact you for 
clarification, DOE may not be able to consider your comment.
    However, your contact information will be publicly viewable if you 
include it in the comment itself or in any documents attached to your 
comment. Any information that you do not want to be publicly viewable 
should not be included in your comment, nor in any document attached to 
your comment. Otherwise, persons viewing comments will see only first 
and last names, organization names, correspondence containing comments, 
and any documents submitted with the comments.
    Do not submit to www.regulations.gov information for which 
disclosure is restricted by statute, such as trade secrets and 
commercial or financial information (hereinafter referred to as 
Confidential Business Information (``CBI'')). Comments submitted 
through www.regulations.gov cannot be claimed as CBI. Comments received 
through the website will waive any CBI claims for the information 
submitted. For information on submitting CBI, see the Confidential 
Business Information section.
    DOE processes submissions made through www.regulations.gov before 
posting. Normally, comments will be posted within a few days of being 
submitted. However, if large volumes of comments are being processed 
simultaneously, your comment may not be viewable for up to several 
weeks. Please keep the comment tracking number that www.regulations.gov 
provides after you have successfully uploaded your comment.
    Submitting comments via email. Comments and documents submitted via 
email also will be posted to www.regulations.gov. If you do not want 
your personal contact information to be publicly viewable, do not 
include it in your comment or any accompanying documents. Instead, 
provide your contact information in a cover letter. Include your first 
and last names, email address, telephone number, and optional mailing 
address. With this instruction followed, the cover letter will not be 
publicly viewable as long as it does not include any comments.
    Include contact information each time you submit comments, data, 
documents, and other information to DOE. No faxes will be accepted.
    Comments, data, and other information submitted to DOE 
electronically should be provided in PDF (preferred), Microsoft Word or 
Excel, WordPerfect, or text (ASCII) file format. Provide documents that 
are not secured, that are written in English, and that are free of any 
defects or viruses. Documents should not contain special characters or 
any form of encryption and, if possible, they should carry the 
electronic signature of the author.
    Campaign form letters. Please submit campaign form letters by the 
originating organization in batches of between 50 to 500 form letters 
per PDF or as one form letter with a list of supporters' names compiled 
into one or more PDFs. This reduces comment processing and posting 
time.
    Confidential Business Information. Pursuant to 10 CFR 1004.11, any 
person submitting information that he or she believes to be 
confidential and exempt by law from public disclosure should submit via 
email two well-marked copies: one copy of the document marked 
``confidential'' including all the information believed to be 
confidential, and one copy of the document marked ``non-confidential'' 
with the information believed to be confidential deleted. DOE will make 
its own determination about the confidential status of the information 
and treat it according to its determination.
    It is DOE's policy that all comments may be included in the public 
docket, without change and as received, including any personal 
information provided in the comments (except information deemed to be 
exempt from public disclosure).

C. Issues on Which DOE Seeks Comment

    Although DOE has not identified any specific issues on which it 
seeks comment, DOE welcomes comments on any aspect of this proposal.

VIII. Approval of the Office of the Secretary

    The Secretary of Energy has approved publication of this 
notification of proposed determination and request for comment.

Signing Authority

    This document of the Department of Energy was signed on September 
29, 2023, by Jeffrey Marootian, Principal Deputy Assistant Secretary 
for Energy Efficiency and Renewable Energy, pursuant to delegated 
authority from the Secretary of Energy. That document with the original 
signature and date is maintained by DOE. For administrative purposes 
only, and in compliance with requirements of the Office of the Federal

[[Page 69871]]

Register, the undersigned DOE Federal Register Liaison Officer has been 
authorized to sign and submit the document in electronic format for 
publication, as an official document of the Department of Energy. This 
administrative process in no way alters the legal effect of this 
document upon publication in the Federal Register.

    Signed in Washington, DC, on September 29, 2023.
Treena V. Garrett,
Federal Register Liaison Officer, U.S. Department of Energy.
[FR Doc. 2023-22149 Filed 10-5-23; 8:45 am]
BILLING CODE 6450-01-P