[Federal Register Volume 86, Number 193 (Friday, October 8, 2021)]
[Rules and Regulations]
[Pages 56608-56644]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2021-21810]



[[Page 56607]]

Vol. 86

Friday,

No. 193

October 8, 2021

Part III





Department of Energy





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10 CFR Parts 429 and 430





Energy Conservation Program: Test Procedure for Clothes Dryers; Final 
Rule

  Federal Register / Vol. 86, No. 193 / Friday, October 8, 2021 / Rules 
and Regulations  

[[Page 56608]]


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DEPARTMENT OF ENERGY

10 CFR Parts 429 and 430

[EERE-2014-BT-TP-0034]
RIN 1904-AD46


Energy Conservation Program: Test Procedure for Clothes Dryers

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

ACTION: Final rule.

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SUMMARY: On July 23, 2019, the U.S. Department of Energy (``DOE'') 
issued a notice of proposed rulemaking (``NOPR'') to amend the test 
procedure for clothes dryers. That proposed rulemaking serves as the 
basis for the final rule. Specifically, this final rule specifies 
additional detail for various provisions within the test procedures; 
specifies rounding requirements for all reported values; applies 
consistent use of nomenclature and corrects typographical errors; and 
removes obsolete sections of the test procedures, including an appendix 
in its entirety.

DATES: The effective date of this rule is November 8, 2021. 
Representations made on or after April 6, 2022 with respect to the 
energy use or energy efficiency of clothes dryers manufactured on or 
after January 1, 2015, must be based on testing conducted in accordance 
with this rule. The incorporation by reference of certain material 
listed in the rule is approved by the Director of the Federal Register 
on November 8, 2021. The incorporation by reference of other material 
listed in this rulemaking was approved by the Director of the Federal 
Register on September 13, 2013.

ADDRESSES: 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, some documents listed in the index, such as those 
containing information that is exempt from public disclosure, may not 
be publicly available.
    A link to the docket web page can be found at www.regulations.gov/docket?D=EERE-2014-BT-TP-0034. The docket web page contains 
instructions on how to access all documents, including public comments, 
in the docket.
    For further information on how to review the docket contact the 
Appliance and Equipment Standards Program staff at (202) 287-1445 or by 
email: [email protected].

FOR FURTHER INFORMATION CONTACT: Mr. Bryan Berringer, U.S. Department 
of Energy, Office of Energy Efficiency and Renewable Energy, Building 
Technologies Office, EE-2J, 1000 Independence Avenue SW, Washington, DC 
20585-0121. Telephone: (202) 586-0371. Email: 
[email protected].
    Mr. Matthew Ring, U.S. Department of Energy, Office of the General 
Counsel, GC-33, 1000 Independence Avenue SW, Washington, DC 20585-0121. 
Telephone: (202) 586-2555. Email: Matthew.Ring @hq.doe.gov.

SUPPLEMENTARY INFORMATION: DOE maintains a previously approved 
incorporation by reference and incorporates by reference the following 
industry standard into part 430:
    International Electrotechnical Commission (``IEC'') Standard 62301, 
``Household electrical appliances-Measurement of standby power'', 
(Edition 2.0, 2011-01).
    Copies of IEC 62301 can be obtained from the International 
Electrotechnical Commission webstore, by going to https://webstore.iec.ch.
    American Standards Institute (``ANSI'')/Association of Home 
Appliance Manufacturers (``AHAM'') HLD-1-2010 (``AHAM HLD-1''), 
Household Tumble Type Clothes Dryers, approved 2010.
    Copies of ANSI/AHAM HLD-1-2010 can be obtained from the Association 
of Home Appliance Manufacturers at 1111 19th Street NW, Suite 402, 
Washington, DC 20036, 202-872-5955, or go to www.aham.org.
    For a further discussion of these standards, see section IV.N.

Table of Contents

I. Authority and Background
    A. Authority
    B. Background
II. Synopsis of the Final Rule
III. Discussion
    A. Scope of Coverage
    B. Definitions
    C. Test Setup
    1. ``Connected'' Clothes Dryers
    2. Dryness Level Selection for Automatic Termination Control 
Dryers
    3. Drum Capacity Measurement
    4. Test Room Conditions
    5. Maintaining Burner Rating for Gas Clothes Dryers
    6. Gas Pressure Tolerance and Measurement
    7. Water Conductivity
    D. Test Conduct
    1. Test Conditions and Consumer Usage Patterns
    2. Inactive and Off Mode Power Measurements
    3. General Test Procedure Provisions at 10 CFR 430.23(d)
    4. Rounding Requirements for Reported Values
    5. Optional Usage of Appendix D1 or Appendix D2
    6. Cycle Time Reporting
    E. Formatting Changes and Typographical Errors
    1. ``Conventional'' and ``Vented'' Nomenclature
    2. Symbol Definitions
    3. Removal of Duplicate Instructions for Test Load Preparation
    4. Typographical Errors
    5. Removal of Obsolete Provisions
    F. Removing Obsolete Appendix D
    G. Test Procedure Costs and Impact
    1. Maintaining Hourly Btu Rating for Gas Clothes Dryers
    2. Final Moisture Content Requirement
    3. Additional Amendments
    H. Harmonization With Industry Standards
    I. Effective and Compliance Dates
IV. Procedural Issues and Regulatory Review
    A. Review Under Executive Order 12866
    B. Review Under the Regulatory Flexibility Act
    C. Review Under the Paperwork Reduction Act of 1995
    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 Treasury and General Government Appropriations 
Act, 2001
    K. Review Under Executive Order 13211
    L. Review Under Section 32 of the Federal Energy Administration 
Act of 1974
    M. Congressional Notification
    N. Description of Materials Incorporated by Reference
V. Approval of the Office of the Secretary

I. Authority and Background

    Clothes dryers are included in the list of ``covered products'' for 
which the DOE is authorized to establish and amend energy conservation 
standards and test procedures. (42 U.S.C. 6292(a)(8)) DOE's energy 
conservation test procedures for clothes dryers are currently 
prescribed in the Code of Federal Regulations (``CFR'') at 10 CFR part 
430, subpart B, appendix D1 and appendix D2 (``appendix D1'' and 
``appendix D2'', respectively). The following sections discuss DOE's 
authority to establish test procedures for clothes dryers and relevant 
background information regarding DOE's consideration of test procedures 
for this product.

[[Page 56609]]

A. Authority

    The Energy Policy and Conservation Act, 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 \2\ of EPCA established the Energy Conservation 
Program for Consumer Products Other Than Automobiles, which sets forth 
a variety of provisions designed to improve energy efficiency. These 
products include clothes dryers, the subject of this document. (42 
U.S.C. 6292(a)(8))
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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).
    \2\ For editorial reasons, upon codification in the U.S. Code, 
Part B was redesignated Part A.
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    The energy conservation program under EPCA consists essentially of 
four parts: (1) Testing, (2) labeling, (3) 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).
    The testing requirements consist of test procedures that 
manufacturers of covered products must use as the basis for (1) 
certifying to DOE that their products comply with the applicable energy 
conservation standards adopted under EPCA (42 U.S.C. 6295(s)), and (2) 
making representations about the efficiency of those products (42 
U.S.C. 6293(c)). Similarly, DOE must use these test procedures to 
determine whether the products comply with any relevant standards 
promulgated under EPCA. (42 U.S.C. 6295(s))
    Federal energy efficiency requirements for covered products 
established under EPCA generally supersede State laws and regulations 
concerning energy conservation testing, labeling, and standards. (42 
U.S.C. 6297) DOE may, however, grant waivers of Federal preemption for 
particular State laws or regulations, in accordance with the procedures 
and other provisions of EPCA. (42 U.S.C. 6297(d))
    Under 42 U.S.C. 6293, EPCA sets forth the criteria and procedures 
DOE must follow when prescribing or amending test procedures for 
covered products. EPCA provides that any test procedures prescribed or 
amended under this section shall be reasonably designed to produce test 
results which measure energy efficiency, energy use or estimated annual 
operating cost of a covered product during a representative average use 
cycle or period of use and shall not be unduly burdensome to conduct. 
(42 U.S.C. 6293(b)(3))
    EPCA also requires that, at least once every 7 years, DOE evaluate 
test procedures for each type of covered product, including clothes 
dryers, to determine whether amended test procedures would more 
accurately or fully comply with the requirements for the test 
procedures to not be unduly burdensome to conduct and be reasonably 
designed to produce test results that reflect energy efficiency, energy 
use, and estimated operating costs during a representative average use 
cycle or period of use. (42 U.S.C. 6293(b)(1)(A)) If the Secretary 
determines, on his own behalf or in response to a petition by any 
interested person, that a test procedure should be prescribed or 
amended, the Secretary shall promptly publish in the Federal Register 
proposed test procedures and afford interested persons an opportunity 
to present oral and written data, views, and arguments with respect to 
such procedures. The comment period on a proposed rule to amend a test 
procedure shall be at least 60 days and may not exceed 270 days. In 
prescribing or amending a test procedure, the Secretary shall take into 
account such information as the Secretary determines relevant to such 
procedure, including technological developments relating to energy use 
or energy efficiency of the type (or class) of covered products 
involved. (42 U.S.C. 6293(b)(2)) If DOE determines that test procedure 
revisions are not appropriate, DOE must publish its determination not 
to amend the test procedures. DOE is publishing this final rule in 
satisfaction of the 7-year review requirement specified in EPCA. (42 
U.S.C. 6293(b)(1)(A))
    In addition, EPCA requires that DOE amend its test procedures for 
all covered products to integrate measures of standby mode and off mode 
energy consumption into the overall energy efficiency, energy 
consumption, or other energy descriptor, unless the current test 
procedure already incorporates the standby mode and off mode energy 
consumption, or if such integration is technically infeasible. (42 
U.S.C. 6295(gg)(2)(A)) If an integrated test procedure is technically 
infeasible, DOE must prescribe separate standby mode and off mode 
energy use test procedures for the covered product, if a separate test 
is technically feasible. (Id.) Any such amendment must consider the 
most current versions of the IEC 62301 \3\ and IEC Standard 62087 \4\ 
as applicable. (42 U.S.C. 6295(gg)(2)(A))
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    \3\ IEC 62301, Household electrical appliances--Measurement of 
standby power. (Edition 2.0, 2011-01).
    \4\ IEC 62087, Methods of measurement for the power consumption 
of audio, video, and related equipment (Edition 3.0, 2011-04).
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B. Background

    DOE's test procedures for clothes dryers manufactured on or after 
January 1, 2015 appear at appendix D1 and appendix D2. Manufacturers 
must use either appendix D1 or appendix D2 to show compliance with the 
applicable energy conservation standards, and must use a single 
appendix for all representations, including certifications of 
compliance.
    In its most recent test procedure rulemaking for clothes dryers, 
DOE published a final rule on August 14, 2013 (``August 2013 Final 
Rule''), amending the clothes dryer test procedure, in which it (1) 
amended appendix D1 to update the reference to the latest edition of 
IEC Standard 62301, ``Household electrical appliances--Measurement of 
standby power,'' Edition 2.0 2011-01 (``IEC Standard 62301''); \5\ (2) 
amended appendix D and appendix D1 to clarify the cycle settings used 
for the test cycle, the requirements for the gas supply for gas clothes 
dryers, the installation conditions for console lights, the method for 
measuring the drum capacity, the maximum allowable weighing scale 
range, and the allowable use of a relative humidity (``RH'') meter; and 
(3) established a new appendix D2 that includes procedures reflecting 
the amendments discussed above as well as testing methods for measuring 
the effects of automatic cycle termination. 78 FR 49608. (For 
additional background on the rulemaking history for clothes dryer test 
procedures, please refer to the August 2013 Final Rule).
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    \5\ IEC Standard 62301 is available online at https://webstore.iec.ch/publication/6789.
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    DOE published a notice of public meeting (``NOPM'') on October 23, 
2014 (``October 2014 NOPM''), and held the public meeting on November 
13, 2014 to facilitate a discussion among interested parties about 
potential changes to the DOE clothes dryer test procedures to produce 
test results that measure energy use during a representative average 
use cycle without being unduly burdensome to conduct.\6\ 79 FR 63336.
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    \6\ A transcript of the public meeting and submitted comments 
are available in the docket for this rulemaking at 
www.regulations.gov/docket?D=EERE-2014-BT-TP-0034.
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    On July 23, 2019, DOE published a NOPR (``July 2019 NOPR'') 
proposing amendments to the test procedures for

[[Page 56610]]

clothes dryers to provide additional direction in response to questions 
from manufacturers and test laboratories. 84 FR 35484. DOE also 
proposed amendments to: (1) Specify rounding requirements for all 
reported values; (2) apply consistent use of nomenclature and correct 
typographical errors; and (3) remove obsolete sections of the test 
procedures, including appendix D. Id. DOE also requested comment from 
interested parties on issues such as consumer usage patterns and 
``connected'' clothes dryer features. Id. The July 2019 NOPR also 
announced a webinar to be held on August 14, 2019, and stated that DOE 
would hold a public meeting to discuss the proposals if one was 
requested by August 6, 2019. Id.
    On July 29, 2019, DOE received a comment from the Northwest Energy 
Efficiency Alliance (``NEEA''), the Natural Resources Defense Council 
(``NRDC''), and Pacific Gas and Electric Company (``PG&E'') requesting 
that DOE hold an in-person public meeting regarding the proposed 
amendments to the clothes dryers test procedures.\7\ On August 2, 2019, 
DOE issued a pre-publication Federal Register notification announcing a 
public meeting and webinar to be held on August 28, 2019, and cancelled 
the previously announced webinar scheduled for August 14, 2019. 84 FR 
39777.
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    \7\ See document number 17 within docket EERE-2014-BT-TP-0034, 
available on www.regulations.gov.
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    On August 2, 2019, and August 5, 2019, DOE received subsequent 
comments from the AHAM requesting to move the webinar and public 
meeting into September 2019.\8\ On August 21, 2019, DOE published a 
notification in the Federal Register changing the public meeting from 
August 28, 2019, to September 17, 2019, and extending the public 
comment period for submitting comments and data on the July 2019 NOPR 
by 14 days to October 7, 2019. 84 FR 43529.
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    \8\ See document numbers 18 and 19 within docket EERE-2014-BT-
TP-0034, available on www.regulations.gov.
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    On September 20, 2019, DOE received a comment from NEEA, NRDC, and 
PG&E requesting an additional 60-day comment period extension.\9\ DOE 
extended the comment period by 30 days to November 6, 2019. 84 FR 52817 
(October 3, 2019).
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    \9\ See document number 22 within docket EERE-2014-BT-TP-0034, 
available on www.regulations.gov.
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    DOE received comments in response to the July 2019 NOPR from the 
interested parties listed in Table II.1.

   Table II.1--Written Comments Received in Response to July 2019 NOPR
------------------------------------------------------------------------
                                   Reference in this
          Commenter(s)                final rule        Commenter type
------------------------------------------------------------------------
Appliance Standards Awareness     Joint Commenters..  Efficiency
 Project, American Council for                         Organizations.
 an Energy-Efficient Economy,
 Alliance to Save Energy,
 Natural Resources Defense
 Council, Consumer Federation of
 America, National Consumer Law
 Center.
California Energy Commission....  CEC...............  Efficiency
                                                       Organization,
Consortium for Energy Efficiency  CEE...............  Efficiency
                                                       Organization.
National Resources Defense        NRDC..............  Efficiency
 Council.                                              Organization.
Northwest Energy Efficiency       NEEA..............  Efficiency
 Alliance.                                             Organization.
Association of Home Appliance     AHAM..............  Trade Association.
 Manufacturers.
BSH Home Appliances Corporation.  BSH...............  Manufacturer.
GE Appliances, a Haier Company..  GEA...............  Manufacturer.
Samsung Electronics America.....  Samsung...........  Manufacturer.
Whirlpool Corporation...........  Whirlpool.........  Manufacturer.
Pacific Gas and Electric,         California IOUs...  Investor-Owned
 Southern California Edison, San                       Utilities
 Diego Gas and Electric.                               (``IOUs'').
------------------------------------------------------------------------
Note: DOE received other comments outside the scope of the July 2019
  NOPR and therefore are not addressed in this final rule.

II. Synopsis of the Final Rule

    In this final rule, DOE amends appendix D1 and appendix D2, both 
entitled ``Uniform Test Method for Measuring the Energy Consumption of 
Clothes Dryers,'' to provide additional detail in response to questions 
from manufacturers and test laboratories, including additional detail 
regarding the testing of ``connected' models, dryness level selection, 
and the procedures for maintaining the required heat input rate for gas 
clothes dryers; additional detail for the test procedures for 
performing inactive and off mode power measurements; specifications for 
the final moisture content (``FMC'') required for testing automatic 
termination control dryers; specification of a narrower scale 
resolution for the weighing scale used to determine moisture content of 
test loads; and specification that the test load must be weighed within 
5 minutes after a test cycle has terminated. In addition, DOE amends 
the test procedures to update the estimated number of annual use cycles 
for clothes dryers; provide further direction for additional provisions 
within the test procedures; specify rounding requirements for all 
reported values; apply consistent use of nomenclature and correct 
typographical errors; remove obsolete sections of the test procedures, 
including appendix D; and update the reference to the applicable 
industry test procedure to the version certified by ANSI.
    DOE's actions are summarized in Table II.2 and addressed in detail 
in section III of this final rule.

      Table II.2--Summary of Changes in the Amended Test Procedure
------------------------------------------------------------------------
                                  Amended test
 Previous DOE test procedure        procedure            Attribution
------------------------------------------------------------------------
Does not explicitly address   Specifies that        Response to test
 the required configuration    clothes dryers with   laboratory comment.
 for network-connected         connected
 functionality.                functionality shall
                               be tested with the
                               network-connected
                               functions in the
                               ``off'' position if
                               it can be disabled
                               by the end-user;
                               otherwise test in
                               the factory default
                               setting.

[[Page 56611]]

 
Silent on selection of the    Specifies using       Response to test
 middle dryness level          either the next-      laboratory comment.
 setting for clothes dryers    highest setting
 with an even number of        above or next-
 settings.                     lowest setting
                               below the midpoint
                               if an even number
                               of discrete
                               settings are
                               provided.
Provides adjustments that     Specifies the order   Response to test
 can be made to maintain the   of adjustment, from   laboratory
 required heat input rate      least burdensome to   question.
 for gas clothes dryers.       most burdensome,
                               for adjustments
                               that can be made to
                               maintain the
                               required heat input
                               rate for gas
                               clothes dryers.
Does not specify how quickly  Specifies that test   Response to NOPR
 a test load must be weighed   load must be          comments to improve
 after a test cycle has        weighed within 5      repeatability and
 terminated.                   minutes after a       reproducibility.
                               test cycle has
                               terminated.
Specifies the use of a spray  Specifies the use of  Response to NOPR
 bottle for achieving the      a spray bottle for    comments.
 initial moisture content in   achieving the
 appendix D2 only.             initial moisture
                               content in both
                               appendix D1 and
                               appendix D2.
Specifies weighing scale      Specifies a narrower  Response to NOPR
 resolution of 0.2 ounces      weighing scale        comments to improve
 (0.01 pounds) to determine    resolution of 0.001   repeatability and
 moisture content of test      pounds to determine   reproducibility.
 loads.                        moisture content of
                               test loads.
Uses the term ``moisture      Defines new terms     Response to NOPR
 content'' to refer to         ``initial moisture    comments.
 several different             content'' and
 measurements of moisture      ``final moisture
 content throughout testing.   content'' to
                               differentiate
                               moisture content
                               measurements during
                               testing and
                               calculations.
Estimates the number of       Updates the estimate  Response to industry
 annual use cycles for         to 236 clothes        comment.
 clothes dryer as 283, based   dryer cycles per
 on 2005 survey data, for      year in appendix
 the purposes of calculating   D2, based on the
 the per-cycle standby mode    latest available
 and off mode energy           2015 survey data.
 consumption calculation.
Requires distinction between  Provides specific     Response to test
 standby mode and off mode     procedures for        laboratory comment.
 based on control panel        measuring the low-
 functionality that may not    power modes of a
 be readily apparent to a      clothes dryer based
 third-party tester.           on observable
                               characteristics of
                               the controls.
Does not explicitly provide   Specifies that the    Response to industry
 the FMC requirement for       requirement to        comment.
 subsequent test runs if the   achieve a final
 prior run was deemed          dryness level of 2
 invalid.                      percent or less
                               also applies to any
                               subsequent run, if
                               required.
Does not include              Adds instructions     To provide
 instructions for              for calculating       consistency between
 calculating annual            annual operating      appendices D1 and
 operating cost, combined      cost and CEF using    D2.
 energy factor ``CEF'', and    appendix D2; adds
 other measures for clothes    annual energy
 dryers optionally tested      consumption
 using appendix D2; does not   calculation using
 include a calculation for     either appendix D1
 annual energy consumption.    or D2.
Does not specify rounding     Specifies rounding    To further specify
 requirements for reported     requirements for      reporting
 values.                       all reported values.  requirements.
Contains nomenclature and     Applies consistent    To improve accuracy
 formatting inconsistencies    use of                and readability.
 and typographical errors.     nomenclature,
                               improves
                               formatting, and
                               fixing
                               typographical
                               errors.
References industry standard  Updates reference to  Harmonization with
 AHAM HLD-1-2009.              the ANSI-certified    industry standard.
                               version of AHAM HLD-
                               1-2009, ANSI/AHAM
                               HLD-1-2010.
------------------------------------------------------------------------

    The Director of the Federal Register previously approved the 
following standard from IEC for incorporation by reference into 
appendix D1 and appendix D2: IEC 62301, ``Household electrical 
appliances-Measurement of standby power'', (Edition 2.0, 2011-01). The 
Director of the Federal Register approved the following standard from 
AHAM for incorporation by reference into appendix D1 and appendix D2: 
ANSI/AHAM HLD-1-2010, ``Household Tumble Type Clothes Dryers.''
    As described in section III.G of this document, DOE has determined 
that the amendments described in section III and adopted in this 
document, other than the amendment to the number of annual use cycles 
in appendix D2, will not substantively alter the measured efficiency of 
clothes dryers, and that the test procedures will not be unduly 
burdensome to conduct. The amendment to the number of annual use cycles 
specified for calculating per-cycle standby mode and off mode energy 
consumption would alter the measured energy efficiency of clothes 
dryers when using appendix D2, but use of the amended value in appendix 
D2 is not required until such time as DOE were to amend the energy 
conservations standards accounting for such changes in the test 
procedure, should such amended energy conservation standards be 
adopted. Discussion of DOE's actions are addressed in detail in section 
III of this document.
    The effective date for the amended test procedures adopted in this 
final rule is 30 days after publication of this document in the Federal 
Register. Representations of energy use or energy efficiency of clothes 
dryers must be based on testing in accordance with the amended test 
procedures beginning 180 days after the publication of this final rule. 
Manufacturers must use the test procedures in either appendix D1 or 
appendix D2 to demonstrate compliance with the current energy 
conservation standards for clothes dryers. Manufacturers must use a 
single appendix for all representations for a given model, including 
certifications of compliance, and may not use appendix D1 for certain 
representations and

[[Page 56612]]

appendix D2 for other representations for that model.

III. Discussion

A. Scope of Coverage

    DOE's clothes dryer test procedures are applicable to both electric 
and gas clothes dryers. DOE regulations define ``electric clothes 
dryer'' and ``gas clothes dryer'' similarly as a cabinet-like appliance 
designed to dry fabrics in a tumble-type drum with forced air 
circulation, with blower(s) driven by an electric motor(s) and either 
electricity or gas, respectively, as the heat source. 10 CFR 430.2. DOE 
did not propose to amend the scope of applicability of DOE's clothes 
dryer test procedures in the July 2019 NOPR. 84 FR 35484, 35487 (July 
23, 2019).
    AHAM agreed with DOE's proposal to not change the scope of 
applicability of DOE's clothes dryer test procedures. (AHAM, No. 33 at 
p. 2) \10\ DOE received no other comments on the scope of the test 
procedure.
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    \10\ A notation in the form ``AHAM, No. 33 at p. 2'' identifies 
a written comment: (1) Made by the Association of Home Appliance 
Manufacturers; (2) recorded in document number 33 that is filed in 
the docket of this test procedure rulemaking (Docket No. EERE-2014-
BT-TP-0034) and available for review at www.regulations.gov; and (3) 
which appears on page 2 of document number 33.
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    DOE is not amending the scope of applicability of DOE's clothes 
dryer test procedures in this final rule.

B. Definitions

    Section 1.13 of appendix D1 and section 1.14 of appendix D2 define 
the term ``moisture content'' as the ratio of the weight of water 
contained by the test load to the bone-dry weight of the test load, 
expressed as a percent. Throughout appendix D1 and appendix D2, the 
term ``moisture content'' is used in some instances to refer to the 
moisture content of the wet load (i.e., before initiating the drying 
cycle), whereas in other instances the term is used to refer to the 
moisture content of the dry load (i.e., immediately after completion of 
the drying cycle). AHAM suggested using distinct terms and associated 
acronyms to clarify the difference. Specifically, AHAM suggested the 
following:
    Initial moisture content (``IMC'') means the ratio of the weight of 
water with the damp test load (prior to drying cycle) to the bone-dry 
weight of the test load, expressed as a percent.
    Final moisture content (``FMC'') means the ratio of the weight of 
water with the final test load (after drying cycle) to the bone-dry 
weight of the test load, expressed as a percent. (AHAM, No. 33 at p. 
11)
    DOE has determined that adding definitions for ``initial moisture 
content'' and ``final moisture content'' will appropriately distinguish 
the relevant moisture content terms throughout both appendix D1 and 
appendix D2. This change in nomenclature does not substantively change 
the test procedure in appendix D1 or appendix D2. DOE is therefore 
amending appendix D1 and appendix D2 to adopt these definitions, with 
non-substantive wording changes to maintain consistent phrasing with 
the current definition of ``moisture content.'' Additionally, DOE uses 
the adopted terminology and acronyms throughout this final rule to 
provide clarity.

C. Test Setup

1. ``Connected'' Clothes Dryers
    Numerous ``connected'' clothes dryer models are currently on the 
market from multiple major manufacturers. These products offer wireless 
network connectivity to enable features such as remote monitoring and 
control via smartphone, as well as demand response features \11\ 
available through partnerships with a small number of local electric 
utilities. DOE observes there are currently a variety of 
implementations of these connected features (i.e., wireless hardware, 
connection setup, and wireless control and programing features) across 
different brands, and that the design and operation of these features 
is continuously evolving as the market continues to grow for these 
products.
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    \11\ ``Demand response features'' refers to product 
functionality that can be controlled by the ``smart grid'' to 
improve the overall operation of the electrical grid, for example by 
reducing energy consumption during peak periods and/or shifting 
power consumption to off-peak periods.
---------------------------------------------------------------------------

    If connected features on a clothes dryer affect its standby mode 
power consumption in the as-shipped configuration (e.g., by energizing 
a wireless communication chip on the circuit board by default), such 
impact would have been measured by the previous test procedure 
provisions in section 3.6 of appendix D1 and appendix D2 for measuring 
standby mode and off mode power. Whereas, if the standby power 
consumption is not affected unless the consumer actively enables the 
connected functionality on the unit, any incremental standby power 
consumption resulting from the connected features would not have been 
measured by the prior test procedure, because the test procedure did 
not include instructions for activating any such features before 
performing the standby mode and off mode measurement. Similarly, any 
incremental energy consumption in active mode, or any other modes of 
operation impacted by the product's connected features, would not have 
been measured as part of the prior DOE test procedure, because the test 
cycle requirements within section 3.3 of appendix D1 and appendix D2 
did not include instructions for activating any such features before 
performing the active mode drying cycle measurements.
    To ensure the repeatability and comparability of test results 
between models, especially those with connected functionality, DOE 
proposed in the July 2019 NOPR to specify in section 3.3 of appendix 
D1, and sections 3.3.1 and 3.3.2 of appendix D2, that units with 
network capabilities be tested with the network-connected functions 
disabled throughout testing. 84 FR 35484, 35493-35494 (July 23, 2019).
    AHAM supported DOE's proposal to conduct testing with connected 
features in the ``off'' position. AHAM noted that connected features 
operate with different capabilities and many have energy saving 
benefits to consumers. AHAM further commented that connected appliances 
can play a critical role in increasing the energy efficiency of the 
grid and can be used by utilities to increase demand response by peak 
load shifting as well as facilitate increased penetration of renewable 
sources of power. AHAM also stated that connected features are 
currently in the early stages of development, and meaningful data are 
currently unavailable on consumer use of connected features, as there 
has been limited market penetration. AHAM cautioned that regulating 
energy consumption associated with connected features could stifle this 
area of innovation and its potential energy savings benefits, stating 
that it is not yet fully known how consumers will use connected 
functionality and which features will be permanently available. 
Finally, AHAM noted that testing in the ``off'' position would be 
consistent with the refrigerator/freezer test procedure and asserted 
that doing so would recognize that this category of products is still 
developing, as is consumers' use and understanding of them. (AHAM, No. 
33 at p. 8)
    Whirlpool commented that incremental standby power consumption 
resulting from connected features should not be measured when the 
consumer is actively required to enable connected functionality (i.e., 
connected functionality is not enabled in the as-shipped 
configuration). Whirlpool also asserted that if a

[[Page 56613]]

connected feature is enabled in the as-shipped position but can be 
optionally disabled by the consumer with the provided manufacturer 
instructions, the feature should be disabled before testing. Whirlpool 
further commented, however, that if there is no means to power off the 
energized component that enables connected functionality, nor 
manufacturer instructions for powering it off, then this energy 
consumption should be measured. (Whirlpool, No. 32 at pp. 3-4)
    The California IOUs, CEC, the Joint Commenters, and NEEA opposed 
testing clothes dryers with network-connected functions in the ``off'' 
position. (California IOUs, No. 29 at p. 20; CEC, No. 31 at p. 4; Joint 
Commenters, No. 34 at pp. 2-3; NEEA, No. 38 at p. 17)
    The California IOUs commented that the ENERGY STAR qualified 
product list features five models sold in the United States that are 
certified as having connected features, and that Consumer Reports have 
tested approximately 50 clothes dryers with connected features--
including 32 percent of the top 25-rated electric and gas standard-size 
clothes dryers and the top two compact-size clothes dryers--with the 
top three recommended dryers costing less than $800 having connected 
capabilities. The California IOUs stated that with this market 
penetration and the overall innovation and growth in the ``Internet of 
Things'' market, capturing the network-connected function energy usage 
is important. (California IOUs, No. 29 at p. 20)
    CEC commented that if DOE requires network-connected functions to 
be in the ``off'' position for testing, the test procedure would fail 
to require measurement of energy consumption of these features, which 
may contribute significantly to standby mode and off mode energy 
consumption. Furthermore, CEC stated that DOE would have insufficient 
information to properly consider future energy conservation standard 
requirements for standby mode, as required by 42 U.S.C. 6295(gg), and 
adequate information may not be provided to consumers, depriving them 
of choice. (CEC, No. 21 at p. 4)
    The Joint Commenters stated that without a measurement of network 
mode power consumption, consumers would have no information about the 
additional energy use associated with the connected functionality. The 
Joint Commenters encouraged DOE to measure the energy associated with 
network-connected functionality in order to better represent the energy 
consumption of connected clothes dryers. The Joint Commenters also 
noted that such a measurement would not impede innovation, since any 
amended standard could account for the additional energy use associated 
with network mode. (Joint Commenters, No. 34 at pp. 2-3)
    While a number of connected clothes dryers are on the market with 
varying implementations of connected features, DOE is not aware of any 
data available, nor did interested parties provide any such data, 
regarding the consumer use of connected features. Therefore, DOE is 
unable to establish a representative test configuration for assessing 
the energy consumption of connected functionality for clothes dryers 
during an average period of use.
    Furthermore, as noted, while DOE's prior test procedure did not 
explicitly require the measurement of energy use associated with any 
connected features, the previous test procedure, in its required 
measurement of standby mode and off mode power, may have captured the 
energy used by features that provide connected functionality. 
Specifically, any energy use of such connected features may have been 
measured in section 3.6 of appendix D1 and appendix D2 if 
manufacturers' instructions specify that the features be turned on, or 
if the connected functionality is enabled by default when the unit is 
powered on. If, however, a manufacturer does not provide such an 
instruction, and the product ships with connected features disabled, 
then such energy consumption would not have been measured under the 
prior test procedures.
    Therefore, to ensure the repeatability and comparability of test 
results between models, especially those with connected functionality, 
DOE is adopting the July 2019 NOPR proposal regarding the network-
connected function setting position. DOE is also providing additional 
detail on the direction to ``disable'' the network function during 
testing. The direction adopted in this final rule provides further 
specification that a network function is to be disabled as capable by 
the end user pursuant to instructions provided in the product's user 
manual.
    DOE has determined that if network functionality cannot be disabled 
by the consumer and the manufacturer's user manual does not provide 
instruction for disabling the function, including the energy 
consumption of the enabled network function is more representative than 
excluding the energy consumption associated with the network function.
    As such, in this final rule DOE is amending section 3.3 of appendix 
D1, and sections 3.3.1 and 3.3.2 of appendix D2, to provide that for 
units with network capabilities, the network settings must be disabled 
throughout testing if such settings can be disabled by the end-user and 
the product's user manual provides instructions on how to do so. 
Further, the amendments explicitly provide that if network settings 
cannot be disabled by the end-user, or the product's user manual does 
not provide instruction for disabling network settings, then the unit 
must be tested with the network settings in the factory default 
configuration for the test cycle.
    Finally, CEE noted that its specification for clothes dryers 
includes optional connected criteria, which are designed to recognize 
units that enable new benefits to customers and the grid or energy 
systems in a diverse range of regulatory conditions (e.g., load delay, 
load reduction, and energy reporting). CEE stated that connected 
products promoted with ratepayer funds should offer multiple pathways 
to connect, including an open, nonproprietary means for connecting 
within the physical bounds of the customer's home (i.e., without 
requiring the use of a manufacturer's ``cloud''). CEE stated further 
that these key elements that need to be addressed are dependent on the 
pending ENERGY STAR test method to validate demand response being 
developed by DOE. CEE encouraged DOE to finalize the ENERGY STAR test 
method as soon as possible and stated that CEE is relying on 
manufacturer written submissions that stipulate compliance with the CEE 
connected criteria until the test method becomes available. (CEE, No. 
27 at pp. 3-4)
    DOE notes that this final rule addresses only whether network-
connected functions are disabled during testing under appendix D1 and 
appendix D2, and does not address testing the demand response 
functionality of any such features. DOE further notes that this final 
rule is separate from the process under ENERGY STAR for validating 
demand response.
2. Dryness Level Selection for Automatic Termination Control Dryers
    Section 3.3.2 of appendix D2 states that where the dryness level 
setting can be chosen independently of the program, it shall be set to 
the ``normal'' or ``medium'' dryness level setting. If such designation 
is not provided, then the dryness level is set at the mid-point between 
the minimum and maximum settings. DOE has received inquiries from 
third-party test laboratories regarding clothes dryers that have 
dryness settings such that a single mid-point between the minimum and 
maximum settings is not available (e.g.,

[[Page 56614]]

a clothes dryer with four dryness settings).
    In the July 2019 NOPR, DOE proposed to specify in section 3.3.2 of 
appendix D2 that if an even number of discrete settings are provided, 
either the next-highest setting above the mid-point, in the direction 
of the maximum dryness setting, or the next-lowest setting below the 
mid-point, in the direction of the minimum dryness setting, is 
selected. 84 FR 35484, 35497 (July 23, 2019).
    AHAM supported DOE's proposal to specify in appendix D2 that if an 
even number of discrete settings are provided, the next-highest setting 
above the mid-point, in the direction of the maximum dryness setting, 
or the next lowest setting below the mid-point, in the direction of the 
minimum dryness setting should be used. (AHAM, No. 33 at p. 9)
    The California IOUs, Joint Commenters, Energy Solutions on behalf 
of the California IOUs (``Energy Solutions''), and NEEA recommended 
that DOE require that for clothes dryers that provide an even number of 
discrete settings that can be chosen independently of the drying 
program, the dryness level should be set to the next highest level 
above the mid-point between the minimum and maximum setting. 
(California IOUs, No. 29 at pp. 20-21; Energy Solutions, Public Meeting 
Transcript, No. 23 at p. 45; \12\ Joint Commenters No. 34 at p. 3; 
NEEA, Public Meeting Transcript, No. 23 at pp. 45-46)
---------------------------------------------------------------------------

    \12\ A notation in the form ``Energy Solutions, Public Meeting 
Transcript, No. 23 at p. 45'' identifies an oral comment that DOE 
received on September 17, 2019 during the public meeting, and was 
recorded in the public meeting transcript in the docket for this 
test procedure rulemaking (Docket No. EERE-2014-BT- TP-0034). This 
particular notation refers to a comment (1) made by Energy Solutions 
during the public meeting; (2) recorded in document number 23, which 
is the public meeting transcript that is filed in the docket of this 
test procedure rulemaking; and (3) which appears on page 45 of 
document number 23.
---------------------------------------------------------------------------

    The California IOUs provided examples of two types of control panel 
configurations in which an even number of discrete dryness settings are 
provided. In one type, the clothes dryer includes a ``damp'' or very 
low dryness setting, for which the product manual identifies ``dry'' as 
the ``normal dryness setting'', which is one step above the mid-point. 
In the second type, the clothes dryer includes a four-step scale from 
``less'' to ``more'' dry. The California IOUs further commented that in 
NEEA's 2014 Dryer Field Study,\13\ (``2014 NEEA field study''), the 
``less dry'' setting was used only 1 percent of the time, while 
``normal'' and ``more dry'' were chosen 65 percent and 34 percent of 
the time, respectively. Based on this, the California IOUs stated that 
selecting the next highest setting from the mid-point would best 
represent an average use cycle for a clothes dryer with an even number 
of discrete dryness settings. (California IOUs, No. 29 at pp. 20-21) 
Energy Solutions commented that when four (or an even number of) 
settings are provided, typically the lowest is an air-dry feature that 
provides no additional drying, such that the order is air dry, low, 
medium, and high. Energy Solutions stated that the intention is not to 
have the setting set to low dryness (i.e., the next-lowest setting from 
the mid-point); but rather, the intention is to have the setting set to 
medium (i.e., the next-highest setting). (Energy Solutions, Public 
Meeting Transcript, No. 23 at p. 45)
---------------------------------------------------------------------------

    \13\ The 2014 NEEA field study surveyed clothes dryer usage 
patterns of 50 households in the Pacific Northwest region. The 
report is available in the docket for this rulemaking at: 
www.regulations.gov/document?D=EERE-2014-BT-TP-0034-0010.
---------------------------------------------------------------------------

    NEEA asserted that using the next-highest setting would reduce test 
burden, as it would decrease the likelihood that the clothes dryer 
would be unable to reach the required remaining moisture content 
requirement and thus need to be retested. Further, NEEA commented that 
DOE should removing ambiguity by providing definitive guidance one way 
or the other, rather than allowing the laboratory to select either the 
next-highest or next-lowest setting. (NEEA, Public Meeting Transcript, 
No. 23 at pp. 45-46)
    BSH recommended that if a clothes dryer's controls have an even 
number of dryness level settings and therefore do not have a mid-point 
that can be selected, the dryness level should be set at the next-lower 
set point below the mid-point. (BSH, No. 30 at pp. 3-4)
    As stated, the previous test procedure did not provide direction as 
to the setting to select if the clothes dryer provides an even number 
of dryness settings, none of which are labeled as ``normal'' or 
``medium.'' To address testing of a clothes dryer with such a 
configuration, DOE is adopting the direction as proposed. The direction 
to select either the next-highest setting above the mid-point, or the 
next-lowest setting below the mid-point, preserves the flexibility of 
manufacturers to assign the number and dryness level of settings 
available on a unit. For example, a manufacturer may assign the second 
of four settings as the selection most closely equivalent to the 
``normal'' dryness setting. In such an instance, it would not be 
appropriate to require selecting the next-highest above the mid-point. 
Additionally, a manufacturer would not be able to select a setting that 
did not achieve a valid test cycle (i.e., an FMC of 2 percent or less, 
as required by section 3.3.2 of appendix D2, which is representative of 
the consumer-accepted dryness level, as described further in section 
III.D.1.e.iii of this document). As such, a manufacturer would not be 
able to select the next-lowest setting below the mid-point if such 
setting did not provide the necessary dryness level. Furthermore, while 
the 2014 NEEA field study presents a percentage of cycle usage by 
dryness setting, the data are limited to three dryness settings (``less 
dry'', ``normal'', and ``more dry'') and therefore do not provide 
insight into the frequency of dryness settings selected for clothes 
dryers with an even number of cycle dryness settings.
    Given the considerations above, DOE is amending section 3.3.2 of 
appendix D2 to state that either the next-highest dryness setting above 
the mid-point or the next-lowest dryness setting below the mid-point 
may be tested. Section 3.4.7 of appendix D2 (which is not amended by 
this final rule) requires recording for each test cycle the cycle 
settings selected, in accordance with section 3.3.2 of appendix D2. The 
certification reporting requirements for clothes dryers at 10 CFR 
429.21(b)(2) require a certification report to include, for products 
tested using appendix D2, a list of the cycle setting selections for 
the energy test cycle as recorded in section 3.4.7 of appendix D2. This 
reporting requirement is unchanged by this final rule. DOE notes that 
the settings used for appendix D2 certification are publicly available 
through DOE's compliance certification database.\14\
---------------------------------------------------------------------------

    \14\ DOE's compliance certification database for appendix D2 is 
available at www.regulations.doe.gov/certification-data/CCMS-4-Clothes_Dryers_-_Appendix_D2.html.
---------------------------------------------------------------------------

3. Drum Capacity Measurement
    Section 3.1 of appendix D1 and appendix D2 requires measurement of 
drum capacity by filling the drum with water and using the weight of 
water in the drum to determine the drum volume. Clothes dryer drum 
capacity is reported by manufacturers in cubic feet (10 CFR 
429.21(b)(2)) and is used to distinguish between compact-size and 
standard-size clothes dryer product classes. See appendix D1, sections 
1.6 and 1.16; appendix D2, sections 1.7 and 1.17.
a. Alternative Drum Capacity Measurement Method
    NEEA suggested that, to reduce test burden, the current drum 
measurement

[[Page 56615]]

approach could be replaced with the tape measurement method used in a 
draft California Commercial Tumble Dryer Test Protocol.\15\ NEEA 
described this method as taking physical measurements with a standard 
tape measure and calipers, and using a formula to compute the volume. 
NEEA noted that although the tape measurement method is expected to be 
less precise than the water measurement method, precision is less 
important, in NEEA's opinion, when drum capacities clearly fall within 
the range for compact-size or standard-size product classes. NEEA 
further proposed that the water measurement method could be retained 
for clothes dryers with drum volumes that are near the product class 
drum volume threshold. Finally, NEEA stated that the current water 
measurement method completed by a third-party laboratory can cost up to 
$500 to perform. (NEEA, No. 38 at p. 17)
---------------------------------------------------------------------------

    \15\ California Commercial Tumble Dryer Test Protocol 2017 
proposal; https://efiling.energy.ca.gov/GetDocument.aspx?tn=219983&DocumentContentId=26567.
---------------------------------------------------------------------------

    Upon reviewing the draft California Commercial Tumble Dryer Test 
Protocol, DOE noted that the tape measurement/caliper method suggested 
by NEEA is only used to measure drum capacities for commercial clothes 
dryers with drum volumes greater than 9.5 cubic feet according to the 
California Commercial Tumble Dryer Test Protocol. Under the California 
draft, a water volume measurement method, similar to that in the DOE 
test procedures at appendix D1 and appendix D2, would still be required 
for clothes dryers with reported drum capacity less than 9.5 cubic 
feet. Nonetheless, DOE investigated the accuracy and effectiveness of 
the California Commercial Tumble Dryer Test Protocol tape measurement/
caliper method for consumer clothes dryers, particularly those with 
rated drum capacities less than 9.5 cubic feet, by comparing the drum 
capacity resulting from the tape measurement/caliper method to the 
rated drum capacity, which is determined based on the water volume drum 
capacity approach in the DOE test procedures. DOE conducted the tape 
measurement/caliper method of the California Commercial Tumble Dryer 
Test Protocol on three compact-size and two standard-size clothes 
dryers, and compared the resulting values to the rated drum capacity. 
The results of this investigation are presented in Table III.1.

                              Table III.1--Drum Capacity Measurement Investigation
----------------------------------------------------------------------------------------------------------------
                                                                    Rated drum     Measured drum
                            Test unit                                capacity        capacity         Percent
                                                                    (ft[sup3])      (ft[sup3])      difference
----------------------------------------------------------------------------------------------------------------
1...............................................................             2.8            2.67            -4.5
2...............................................................             3.6            3.63             0.7
3...............................................................             4.0            3.87            -2.8
4...............................................................             5.1            5.13             0.6
5...............................................................             7.4            7.32            -1.1
----------------------------------------------------------------------------------------------------------------

    The results in Table III.1 show a range of differences between the 
two methods (from -4.5 percent to +0.6 percent), which DOE attributes 
to the inherently less precise nature of the California Commercial 
Tumble Dryer Test Protocol, including the inherent variability in 
measuring irregular contours within the drum. Under the California 
Commercial Tumble Dryer Test Protocol, test technicians are instructed 
to approximate any irregular volumes. The tape measurement/caliper 
method from the California Commercial Tumble Dryer Test Protocol is 
designed for measuring the capacity of larger drums associated with 
commercial clothes dryers, for which the variability in approximating 
irregular volumes has lesser relative impact on drum capacity 
measurements; however, for smaller consumer clothes dryers, these 
approximations may have more significant impacts on reported drum 
capacity.
    The results of the tape measurement/caliper method investigative 
testing demonstrate that the draft California Commercial Tumble Dryer 
Test Protocol could yield capacity measurement values that differ by up 
to 5 percent from the current drum capacity measurement method in the 
DOE test procedures. While a difference of this magnitude could 
potentially be acceptable for large-capacity clothes dryers that are 
clearly above the 4.4 cubic foot threshold that differentiates the 
standard and compact consumer clothes dryer product classes, further 
investigation and analysis would be required to better understand the 
implications of using the tape measurement/caliper method for consumer 
clothes dryers, and to determine the range of capacities for which the 
tape measurement/caliper method could be appropriate for use as an 
alternative to the water volume drum capacity approach. DOE does not 
have sufficient information at this time with which to implement such 
an alternative capacity measurement method. Therefore, DOE is not 
amending appendix D1 and appendix D2 at this time to include a tape 
measurement method for determining consumer clothes dryer drum 
capacity.
b. Drum Capacity Measurement Water Temperature
    The clothes dryer test procedures do not specify a temperature for 
the water used in the drum capacity test. AHAM proposed that DOE 
establish water temperature requirements in appendix D1 and appendix D2 
that align with section 3.1.4 of the clothes washer test procedure 
located in 10 CFR part 430, subpart B, appendix J2 (``appendix J2''), 
which requires either 60 degrees Fahrenheit (``[deg]F'') 5 
[deg]F (15.6 degrees Celsius (``[deg]C'') 2.8 [deg]C) or 
100 [deg]F 10 [deg]F (37.8 [deg]C 5.5 [deg]C) 
water. (AHAM No. 33 at p. 12)
    DOE recognizes that water density varies based on water 
temperature. Section 3.1.6 of appendix J2 specifies using a water 
density of 62.3 pounds per cubic foot (lb/ft\3\) for 60 [deg]F water or 
62.0 lb/ft\3\ for 100 [deg]F water. For the clothes washer test 
procedure, specifying the temperature of the water is necessary because 
the volume of the clothes container must be determined to the nearest 
0.01 cubic feet for the purpose of determining test load sizes. 
(Section 3.1.7 of appendix J2) Whereas, DOE is not aware of any 
instance, and commenters have provided none, in which this degree of 
precision is required for the clothes dryer test procedure. For this 
reason, DOE is not amending appendix D1 and appendix D2 to specify the 
water temperature during the drum capacity test.

[[Page 56616]]

4. Test Room Conditions
    Section 2.2.1 of appendix D1 and appendix D2 specify maintaining 
the test chamber ambient air temperature at 75 3 [deg]F and 
a room RH of 50 10 percent.
    The California IOUs and AHAM recommended that DOE tighten the 
tolerances for ambient temperature and humidity to improve 
repeatability of testing results. (California IOUs, No. 29 at pp. 12-
13; AHAM, No. 33 at p. 12) The California IOUs referenced clothes dryer 
testing conducted by PG&E in 2019 \16\ (``2019 PG&E testing''), for 
which three models were tested according to appendix D2 with the 
ambient conditions maintained at an average of 75 [deg]F and 50 percent 
RH (corresponding to the nominal test conditions specified by appendix 
D2), with additional tests performed at an average of 72.4 [deg]F and 
57 percent RH (remaining within the specified tolerances of appendix 
D2). The California IOUs noted that for the three models tested, the 
two models with the lowest CEF results under the 75 [deg]F and 50 
percent RH test conditions switched rank order when tested at 72.4 
[deg]F and 57 percent RH. (California IOUs, No. 29 at pp. 12-13)
---------------------------------------------------------------------------

    \16\ Test results from the 2019 PG&E testing are referenced in 
the California IOUs comment in the docket for this rulemaking at: 
www.regulations.gov/document?D=EERE-2014-BT-TP-0034-0029.
---------------------------------------------------------------------------

    AHAM asserted that operating at either end of the current humidity 
level tolerance range can significantly impact drying performance. AHAM 
proposed tightening the tolerances on these requirements as follows: 
Room ambient air temperature to 75 2 [deg]F and room RH to 
50 5 percent. AHAM suggested that this adjustment would not 
increase test burden because test laboratories are already capable of 
maintaining the tighter tolerances. (AHAM, No. 33 at p. 12)
    GEA supported all requests for tighter tolerances in the AHAM 
comments. GEA stated that its laboratories are currently able to 
maintain the tolerances suggested by AHAM without additional test 
burden or cost, and that GEA does not have any information indicating 
other laboratories would not be able to obtain these same levels of 
precision with little to no additional cost or burden. (GEA, No. 37 at 
p. 2)
    DOE notes that the relevant 2019 PG&E testing was limited to three 
units, which is an insufficient sample of units to demonstrate a 
quantifiable and representative trend across all units on the market. 
AHAM did not provide any data in support of its comment on this issue. 
DOE does not have sufficient data at this time to justify making any 
changes to the ambient conditions specified in the test procedure. 
Further testing would be required on a broader, more representative 
selection of units in order to assess whether reducing the temperature 
and humidity tolerances would provide more repeatable test results. For 
these reasons DOE is not making any changes to the currently specified 
temperature and humidity tolerances at this time.
    Section 2.2.1 of appendix D1 and appendix D2 specifies maintaining 
the room RH at 50 10 percent. BSH suggested that the 
current RH tolerance in appendix D1 and appendix D2 could be 
interpreted as either 10 percent of 50 (i.e., a 5 percent RH range--45 
percent to 55 percent) or a 10 percent RH range (i.e., 40 percent to 60 
percent). BSH recommended that DOE specify maintaining the room RH 
between the limits of 45 percent to 55 percent. (BSH, No. 30 at p. 3)
    The RH specification requires maintaining RH in the range of 40 
percent to 60 percent. DOE notes that when it initially established the 
clothes dryer test procedure in a final rule published on September 14, 
1977, section 2.2 of appendix D stated, ``Maintain the . . . room 
relative humidity at 40 percent to 60 percent relative humidity.'' 42 
FR 46145, 46150.\17\ To address the potential for misinterpretation 
identified by BSH, DOE is amending how the RH requirement is described 
in the test procedures by specifying to maintain the room RH at 50 
percent 10 percent RH. This clarification is consistent 
with the previous test procedure and does not constitute a change to 
that test procedure.
---------------------------------------------------------------------------

    \17\ DOE revised how the relative humidity specification was 
presented in appendix D (i.e., presenting the specification as ``50 
 10 percent'') in a final rule published May 19, 1981, 
but stated that the substance of the requirement was not being 
amended. See 46 FR 27324, 27325.
---------------------------------------------------------------------------

5. Maintaining Burner Rating for Gas Clothes Dryers
    Section 2.3.2.1 of appendix D1 and appendix D2 requires that 
natural gas clothes dryers maintain the hourly British thermal unit 
(``Btu'') rating of the burner during testing to within 5 
percent of the hourly Btu rating specified by the manufacturer.\18\ 
Section 2.3.2.2 of appendix D1 and appendix D2 provides analogous 
requirements for propane clothes dryers. The requirement to maintain 
the hourly Btu rating of the burner provides repeatable test 
conditions, recognizing that the rate of heat input into a clothes 
dryer can significantly affect its performance. These sections provide 
instructions regarding tolerances and adjustments that can be made to 
the inlet gas pressure,\19\ gas pressure regulator setpoint,\20\ and/or 
modifications to the orifice \21\ in order to maintain the hourly Btu 
rating within 5 percent of the rating specified by the 
manufacturer.
---------------------------------------------------------------------------

    \18\ The hourly Btu rating of a gas clothes dryer is typically 
specified on the product's nameplate sticker.
    \19\ For natural gas clothes dryers, section 2.3.2.1 of appendix 
D1 and appendix D2 specifies maintaining the gas supply pressure 
immediately ahead of all controls within a range of 7 to 10 inches 
of water column. For propane clothes dryers, section 2.3.2.2 of 
appendix D1 and appendix D2 specifies maintaining the gas supply 
pressure immediately ahead of all controls within a range of 11 to 
13 inches of water column.
    \20\ For both natural gas and propane clothes dryers, if the 
clothes dryer is equipped with a gas appliance pressure regulator 
for which the manufacturer specifies an outlet pressure, the 
regulator outlet pressure must be maintained within 10 
percent of the value recommended by the manufacturer in the 
installation manual, on the nameplate sticker, or wherever the 
manufacturer makes such a recommendation for the basic model.
    \21\ The orifice is an attachment that typically screws into the 
outlet of the gas pressure regulator and has a small-diameter outlet 
hole, through which the gas flows into the burner. For both natural 
gas and propane clothes dryers, the test procedures provide for 
modifying the orifice of the gas burner as necessary if the required 
hourly Btu rating cannot be achieved under the allowable range in 
gas inlet pressure.
---------------------------------------------------------------------------

    If the required hourly Btu rating cannot be achieved under the 
allowable range in gas inlet pressure, the prior test procedures 
provided instruction for modifying the orifice of the gas burner as 
necessary (i.e., adjustments to the gas inlet pressure should be made 
before considering modifications to the orifice). However, the large 
majority (if not all) of clothes dryers currently on the market include 
a gas pressure regulator, which is situated between the gas inlet and 
the orifice. Since the purpose of a gas pressure regulator is to 
provide a constant output pressure regardless of fluctuations in 
upstream supply pressure, adjusting the gas inlet pressure upstream of 
a pressure regulator will typically have no impact on the pressure of 
the gas exiting the regulator and entering the orifice, or likewise the 
hourly Btu rating.
    To provide further direction applicable to the large majority of 
gas clothes dryers on the market that include a gas pressure regulator, 
in the July 2019 NOPR, DOE proposed an order of adjustment for 
maintaining the hourly Btu rating within specification as follows: 
(First) adjust the supply gas pressure, (second) adjust the pressure 
regulator setpoint, or (third) modify the orifice as necessary. 84 FR 
35484, 35494 (July 23, 2019). The proposed order specifies using an 
approach with the

[[Page 56617]]

least amount of test burden necessary to achieve the specified test 
conditions. This order also corresponds to the least amount of 
modification to the unit that would be necessary to achieve the 
specified test conditions. Adjusting the supply gas inlet pressure 
requires no modifications to the clothes dryer itself. Adjusting the 
pressure regulator setpoint typically requires removing an access panel 
on the clothes dryer and tightening or loosening a screw on the 
regulator. Modifying the orifice typically requires removing an access 
panel on the clothes dryer, disassembling the burner, removing the 
orifice, modifying the orifice (e.g., by drilling a larger-diameter 
outlet hole), reinstalling the orifice, and finally reassembling the 
burner.
    In DOE's testing experience, any deviation of the hourly Btu rating 
beyond 5 percent of the rated value can be remedied with a 
minor adjustment to the gas pressure regulator (within the allowable 
range of 10 percent of the recommended pressure level). 
Based on DOE's experience with third-party test laboratories, 
preferentially starting with the least burdensome adjustments before 
trying progressively more burdensome adjustments is generally 
consistent with industry practice.
    In the July 2019 NOPR, DOE proposed to provide this direction in a 
new section 2.3.2.3 in both appendix D1 and appendix D2, which would 
apply to both natural gas and propane clothes dryers. In conjunction, 
DOE proposed simplifying the existing provisions within sections 
2.3.2.1 and 2.3.2.2 to reduce duplication with provisions that would be 
included in the new section 2.3.2.3, and therefore improve the overall 
readability of the test procedures.
    NEEA supported specifying the order of specification for 
adjustment; however, NEEA urged DOE to remove the third proposed option 
to physically modify the gas orifice. NEEA suggested that in its 
experience, such modifications are not included in installation manuals 
supplied with the product, and physically modifying the orifice may 
produce test results that would not be representative of the 
manufactured product as installed in the field. (NEEA, No. 38 at p. 17) 
NEEA further suggested that the test procedure should specify test 
conditions that are achievable, and that if a unit is unable to stay 
within those parameters, modification would need to occur on the 
manufacturing side rather than as the responsibility of the testing 
technician to physically modify the product. (NEEA, Public Meeting 
Transcript, No. 23 at pp. 27-30, 40-41)
    AHAM supported DOE's proposal, stating that it is consistent with 
current best laboratory practice, would clarify and simplify the test 
procedure, would codify the method that has long been used to test 
clothes dryers, and is needed to ensure test conditions can be met 
throughout the test. AHAM also stated that if these three steps are not 
permitted, the test will become unduly burdensome to conduct. In 
addition, AHAM explained that providing for adjustment of the orifice 
represents a balance among test burden and the accuracy, repeatability, 
and reproducibility of the test. (AHAM, No. 33 at p. 8; AHAM, Public 
Meeting Transcript, No. 23 at pp. 29-32)
    The purpose for adjustment of the orifice during testing is to 
ensure that the performance of the clothes dryer is representative of 
performance at the Btu rating specified by the manufacturer on the 
product's nameplate, which informs the field installation conditions. 
Allowing for adjustment of the orifice reduces test burden and improves 
repeatability by providing test laboratories with a last resort to 
maintain the hourly Btu rating as specified by the manufacturer. As 
stated in the July 2019 NOPR proposal, modification of the burner 
orifice shall be used as the last choice for maintaining the hourly Btu 
rating. 84 FR 35484, 35494 (July 23, 2019).
    Based on all the available information, including the experience of 
DOE, industry, and laboratories with testing, and to ensure the test is 
repeatable with minimal test burden as discussed in the preceding 
paragraphs, DOE is amending the test procedure as proposed in the July 
2019 NOPR to provide the order of the existing provisions that shall be 
taken to maintain the hourly Btu rating within 5 percent of 
the rating specified by the manufacturer.
6. Gas Pressure Tolerance and Measurement
    Section 2.3.2.1 of appendix D1 and appendix D2 requires that the 
natural gas supply pressure must be maintained between 7 to 10 inches 
of water column ahead of all controls for all gas clothes dryers using 
natural gas. The hourly Btu rating of the gas burner must be maintained 
within 5 percent of the rating specified by the 
manufacturer, and the natural gas supplied must have a heating value of 
approximately 1,025 Btu per standard cubic foot. The actual heating 
value must be obtained by use of a standard continuous flow calorimeter 
described by section 2.4.6 of appendix D1 and appendix D2, or by the 
purchase of bottled natural gas whose Btu rating is certified to be at 
least as accurate as that obtained by use of a standard continuous flow 
calorimeter.
    GEA suggested that the current gas input pressure tolerance of 
between 7 and 10 inches water column (``WC'') may create unreasonable 
variance in the test outcomes. GEA noted that while a range may be 
necessary to reach the rated Btu/hr of a unit for testing, the 
procedure should be amended to reduce variability where possible. 
Referencing the process set forth in ANSI Standard Z21.5.1-2017, ``Gas 
Clothes Dryers, Volume I, Type 1 Clothes Dryers,'' GEA recommended that 
DOE adopt 7 inches WC as the target with a maximum of 10 inches WC in 
its gas clothes dryer test procedures.
    GEA further suggested that the range for the target Btu/hour during 
testing should be the nominal rating of the appliance 2.5 
percent rather than the currently specified 5 percent, 
noting that the current range allows for a 10-percent variation in Btu/
hr, which is a key measure used to determine energy usage by gas 
clothes dryers. GEA stated that the current range allows too much 
variability in testing results. According to GEA, the proposed tighter 
range would not increase test burden. (GEA, No. 37 at p. 3)
    DOE is unaware of any data that suggests either the current gas 
input pressure tolerance or the current tolerance of 5 
percent of hourly Btu rate produces unrepresentative or unrepeatable 
test results. GEA did not provide any such data. In addition, as 
discussed previously, the large majority of (if not all) clothes dryers 
currently on the market include a gas pressure regulator, which is 
situated between the gas inlet and the orifice. Adjusting the gas inlet 
pressure upstream of a pressure regulator will typically have no impact 
on the pressure of the gas exiting the regulator, or likewise the 
hourly Btu rating. Absent data or other information demonstrating an 
issue with the current natural gas supply conditions, DOE is not 
amending these provisions.
    GEA further commented that gas flow meters vary by manufacturer and 
type and described the wide variation in different types of meters. GEA 
suggested that given the wide range of issues and error that can be 
introduced by the wide variability in gas flow meters, DOE should 
specify type and capacity standards for the type of gas flow meter to 
be used for the gas clothes dryer test procedures. (GEA, No. 37 at pp. 
3-4) GEA further noted that the gas heating value (``GEF'') specified 
in the procedures for gas clothes dryers must be corrected according to 
the U.S. Bureau of Standards, circular C417,

[[Page 56618]]

1938 (as specified in section 3.4.6.3 of appendix D1 and appendix D2), 
which requires a series of correction and conversion factors. GEA 
commented that the calculations and corrections vary according to 
calorimeter equipment instructions, type of gage flow meter used, and 
may be influenced by gas supply pressure, barometric pressure, gas 
temperature, and gas absolute pressure (``psia''). GEA suggested that 
all formulas and measurements used in making GEF calculations should be 
clearly specified in the DOE gas clothes dryer procedures, and that 
this missing information increases test uncertainty and creates 
reproducibility and reliability issues for the DOE verification 
program. (GEA, No. 37 at p. 4)
    Additionally, GEA commented that the Heat Input Test (required in 
sections 2.3.2.1 and 2.3.2.1 of appendix D1 and appendix D2) is an 
essential part of determining the hourly Btu rating in the appendix D1 
and appendix D2 test procedures for gas clothes dryers, but there is 
currently no specified procedure on how the Heat Input Test is to be 
performed. GEA requested that DOE develop a procedure for the heating 
input test to determine the Btu/hr of the clothes dryer under test, and 
that the procedure should include requirements for load size, load 
wetness, clothes dryer cycle selection, clothes dryer run time, and gas 
flow verification during the measurement period. GEA asserted that this 
would resolve various issues, including the need to account for the 
time for gas flow to begin after cycle start, the change in input rate 
over time for the first several minutes of burner operation, and the 
potential for burner cycling during the Heat Input Test. GEA 
recommended that DOE review the procedure in ANSI Z21.1-2016/CSA 1.1-
2016, ``Household Cooking Gas Appliances'' (``ANSI Z21.1-2016/CSA 1.1-
2016''), which specifies that measurements not be taken until 5 minutes 
after burner ignition to account for variation in flow rate caused by 
heat effects on the equipment. GEA also recommended that the Heat Input 
Test be performed with a DOE test cloth load wetted in the same fashion 
as done for the primary energy consumption test, to ensure that the 
burner in the clothes dryer is running for the complete measurement 
time during the Heat Input Test. (GEA, No. 37 at pp. 4-5)
    DOE understands that test laboratories do not all use the same gas 
flow meters; however, DOE is unaware of data or other information 
suggesting any substantive variation in test results due to the use of 
different gas flow meters. DOE also reviewed ANSI Z21.1-2016/CSA 1.1-
2016 and determined that for the purposes of measuring the hourly Btu 
rating for gas clothes dryers, the products that are the subject of 
that test standard differed too widely in use and purpose from clothes 
dryers to warrant direct application of testing provisions to appendix 
D1 and appendix D2. Although DOE does not currently specify a 
particular procedure for measuring the Btu firing rate of the burner, 
DOE is unaware at this time of any data that would suggest a 
significant variation in test results associated with different methods 
of measuring the hourly Btu rating for gas clothes dryers. GEA did not 
provide any such data. For these reasons, DOE is not specifying type 
and capacity standards for the gas flow meter in appendix D1 and 
appendix D2, and is not specifying a procedure to use for determining 
the Btu firing rate of the gas clothes dryer burner at this time.
    Were DOE to become aware of data on any of the topics covered in 
this section, DOE would consider such data in a future evaluation of 
the clothes dryer test procedure as appropriate.
7. Water Conductivity
    The DOE test procedure does not specify a requirement for water 
conductivity, which is a measurement of the water's ability to conduct 
electric current and is expressed in microsiemens per centimeter 
(``[mu]S/cm''). The California IOUs suggested that while the 
reproducibility of the appendix D2 test procedure is reasonable, 
variations due to water conductivity need to be addressed to ensure 
reproducible test results. The California IOUs presented test data from 
the 2019 PG&E Testing showing measured CEF as a function of water 
conductivity for six clothes dryer models. Each model was tested 
multiple times, and the data indicates the measured CEF value and 
measured water conductivity for each test. Two of the models 
demonstrated a positive correlation (i.e., CEF increased as water 
conductivity increased), whereas four of the models showed either 
negative correlation or no significant correlation between water 
conductivity and CEF. The California IOUs also presented an analysis of 
the repeatability of the measured CEF values from one of the models in 
the PG&E test sample and concluded that reproducibility improves when 
water conductivity is controlled. (California IOUs, No. 29 at pp. 7-9)
    The California IOUs stated that water hardness and water 
conductivity can be controlled independent of one another and have 
naturally occurring variances around the United States. The California 
IOUs suggested that water conductivity can play an important role in 
how effective a clothes dryer's automatic cycle termination feature 
operates, particularly for a common automatic cycle termination method 
that uses moisture sensing bars to calculate the moisture content of 
the load. Id.
    The California IOUs urged DOE to explore this variable further. The 
California IOUs suggested the DOE test procedure require testing at 
multiple water conductivity levels or incorporate the impact of this 
variable through other means in order to encourage manufacturers to 
address potential CEF variability due to water conductivity and thereby 
improve CEF reproducibility and repeatability. (California IOUs, No. 29 
at pp. 5-12)
    To address these comments, DOE conducted investigative testing 
exploring the effects of water conductivity on the measured CEF value. 
DOE tested a sample of six consumer clothes dryers representing a range 
of product classes and efficiency levels, varying the water 
conductivity between 0 [mu]S/cm (i.e., distilled water) and 800 [mu]S/
cm (i.e., the maximum safe level in accordance with the water quality 
standards cited by the California IOUs in their comment). The water 
used to saturate the test cloth was prepared using distilled water with 
added table salt (sodium chloride), sufficient to achieve the desired 
conductivity, confirmed using a conductivity meter. Each of the six 
test units was tested three times according to appendix D2, saturating 
the test cloth in successive tests with water having a conductivity 
level of 0 [mu]S/cm (distilled), 400 [mu]S/cm, and 800 [mu]S/cm. Figure 
III.1 presents the CEF values from the three tests for each of the six 
units tested at varying levels of water conductivity, additionally 
including results from previous testing using tap water. DOE estimated 
the conductivity of its tap water as 130 [mu]S/cm, based on an average 
of multiple measurements on different test days.

[[Page 56619]]

[GRAPHIC] [TIFF OMITTED] TR08OC21.023

    The results shown in Figure III.1 indicate no discernable 
correlation between CEF and water conductivity, with minimal change in 
CEF overserved for Units 1 through 4. Unit 6 exhibited a substantially 
higher CEF at 130 [mu]S/cm and 400 [mu]S/cm, while Unit 5 demonstrated 
a lower CEF for only the distilled water test; in neither case, 
however, did the trend in CEF correlate consistently with water 
conductivity. DOE's data suggest that CEF is not directly related to 
water conductivity, as there is no predictable or consistent 
correlation between CEF and water conductivity.
    Similarly, the test results submitted by PG&E also showed 
inconsistent correlations between CEF and water conductivity (i.e., in 
some cases a positive correlation, in some cases a negative 
correlation, and in other cases no clear correlation), and limited 
evidence from a single clothes dryer model suggesting that controlling 
for water conductivity may lead to more repeatable or reproducible 
results. (California IOUs, No. 34 at pp. 9-12) DOE appreciates the 
information regarding water conductivity and its potential effect on 
repeatability and reproducibility of the test procedure. However, the 
data provided by commenters and additional data obtained through DOE's 
investigative testing do not definitively suggest any clear and 
predictable correlation between water conductivity and measured 
efficiency, and thus, do not indicate that including a specification in 
the test procedure for water conductivity would improve the 
repeatability or reproducibility of the test results. For these 
reasons, DOE is not adopting a water conductivity requirement in this 
final rule.

D. Test Conduct

1. Test Conditions and Consumer Usage Patterns
    DOE received various comments in response to the July 2019 NOPR 
regarding testing conditions in the DOE clothes dryer test procedure. 
The following sections discuss these issues and changes to the DOE 
clothes dryer test procedure.
a. Test Load Size
    Section 2.7 of appendix D1 and appendix D2 specifies a test load 
weight of 8.45 pounds  .085 pounds for standard-size 
clothes dryers (i.e., with a drum capacity of 4.4 cubic feet or 
greater) and a test load weight of 3 pounds  .03 pounds for 
compact-size clothes dryers (i.e., with a drum capacity of less than 
4.4 cubic feet).
    NEEA, the California IOUs, Joint Commenters, CEC, NRDC, and Samsung 
urged DOE to include additional load size testing, with priority given 
to small load sizes. These commenters generally stated that small loads 
represent a large percentage of clothes dryer cycles in the field and 
result in lower measured efficiency compared to the required load 
sizes. These commenters asserted that adding a smaller load size to the 
test procedure would make the test more representative, and the 
efficiency ratings more useful, for consumer purchasing decisions. The 
details of each comment are presented as follows, including discussion 
of data sources and each commenter's assertions. (NEEA, Public Meeting 
Transcript, No. 23 at pp. 90, 101-104, 105-107, 112-113; California 
IOUs, Public Meeting Transcript, No. 23 at pp. 104-105, 139-144; CEC, 
Public Meeting Transcript, No. 23 at pp. 150; Joint Commenters No. 34 
at pp. 1-2; NRDC, No. 35 at p. 2; Samsung, No. 36 at p. 3)
i. 2014 NEEA Field Study
    NEEA and the California IOUs cited the 2014 NEEA field study as 
justifying the use of an additional half-size test load. NEEA commented 
that the 2014 NEEA field study and recent national market research 
conducted by the California IOUs suggest that typical load sizes vary 
widely, but that small loads represent 20 to 40 percent of all loads. 
The California IOUs cited from the 2014 NEEA field study that the 8.45-
pound test load specified in appendix D1 and appendix D2 for standard-
sized clothes dryers is close to the average weight of ``simple loads'' 
\22\ (7.87 pounds), but the most common load weights were smaller, with 
40.5 percent of loads being less than 6.5 pounds. The California IOUs 
also referenced the 2014 NEEA field study in commenting that clothes 
drying performance at the average load size is not predictive of 
performance at small load sizes. The California IOUs and NEEA suggested 
that a test load half the size of the DOE-specified load could capture 
the reduced clothes dryer performance with small-size loads and would 
produce a more representative efficiency ranking order for clothes 
dryers. NEEA suggested that small loads

[[Page 56620]]

result in less energy efficient performance due to higher relative 
startup energy, lower cloth surface area, reduced contact of the cloth 
with the moisture sensing strips, and reduced effectiveness of using 
the measured exhaust temperature to assess the remaining moisture 
content. NEEA also suggested that consumers may separate garments from 
the washer into multiple drying loads, resulting in more clothes dryer 
loads per year than washer loads, with each clothes dryer load being 
smaller, on average. (California IOUs, Public Meeting Transcript, No. 
23 at pp. 104-105, 139-144; NEEA, Public Meeting Transcript, No. 23 at 
pp. 90, 101-104, 105-107, 112-113)
---------------------------------------------------------------------------

    \22\ Simple loads are defined in the 2014 NEEA field study as 
clothes dryer loads with the following characteristics: The load is 
both washed and dried; the IMC is between 33 percent and 100 
percent, the bone-dry weight is between 3 pounds and 15 pounds; no 
items are removed between the wash and dry cycles; the dryer is not 
run multiple times.
---------------------------------------------------------------------------

    AHAM commented that although NEEA's data showed small clothes dryer 
load sizes in the Pacific Northwest, the data are not representative of 
national clothes dryer usage, and that clothes dryer use may differ 
from region to region. (AHAM, Public Meeting Transcript, No. 23 at pp. 
103-104)
ii. 2019 PG&E Market Survey
    The California IOUs asserted that, based on the survey of clothes 
dryer usage in 210 single family households conducted by PG&E in 
September 2019 (``2019 PG&E market survey''),\23\ clothes dryer usage 
(including load sizes and cycle settings) does not significantly vary 
between seasons, with only cycle settings exhibiting some variation 
between the Pacific Northwest and the rest of the United States. The 
California IOUs commented that results for the typical clothes dryer 
load size showed no significant differences when comparing winter and 
summer load operation, while the regional differences between the 
Pacific Northwest and the rest of the United States were minimal. The 
California IOUs suggested that the results provide further context and 
validity to the usage patterns presented in the 2014 NEEA field study. 
(California IOUs, No. 29 at pp. 1-4, 13-15)
---------------------------------------------------------------------------

    \23\ The survey respondents were asked to identify their typical 
dryer load size and settings in the summer (June through August) and 
winter (December through February) seasons.
---------------------------------------------------------------------------

iii. Other Testing
    NEEA commented that its organization tested 12 electric clothes 
dryer models manufactured after 2015 with both the DOE standard load 
and a smaller load comprised of what NEEA stated was ``real clothing.'' 
NEEA presented test data and concluded that the measured efficiency 
rank order among the tested models changed appreciably from the 
standard load size test, with the ENERGY STAR-qualified units 
particularly demonstrating lower efficiency with the smaller load size 
relative to the non-ENERGY STAR-qualified units in its sample for both 
electric and gas units. (NEEA, No. 38 at pp. 1-3, 9-11, 18)
    The California IOUs commented that in the 2019 PG&E testing, PG&E 
investigated the impact of smaller load sizes on three standard-size 
clothes dryer models from different brands. The California IOUs cited 
the results of the 2019 PG&E testing in which the efficiency rank order 
of the three models changed when tested with smaller loads. Based on 
these results, the California IOUs commented that that the appendix D2 
test procedure may not accurately represent drying of smaller loads. 
The California IOUs recommended including a smaller load size as part 
of the clothes dryer test procedure in order to capture the rank order 
and CEF variability under commonly used clothes dryer operating 
conditions. (California IOUs, No. 29 at pp. 1-4, 13-15)
    NRDC recommended that DOE consider any updates to the IEC clothes 
dryer test procedure regarding smaller test load sizes, but that DOE 
should not wait for IEC before DOE proposes changes to the DOE test 
procedure. (NRDC, No. 35 at p. 2)
iv. DOE Response
    DOE appreciates the data provided by the commenters regarding 
various study and survey results relating to the energy efficiency 
performance of clothes dryers when drying smaller load sizes. DOE notes 
that the cited studies and surveys are not conclusively representative 
of the entire country, given that they were limited in scope and 
geographic location. The 2019 PG&E market survey data did not 
effectively demonstrate that there were no significant differences 
between the Pacific Northwest and the rest of the United States in 
clothes dryer load size. For example, these data showed fewer ``Mostly 
Full'' loads in the Pacific Northwest (50 percent in the winter and 50 
percent in the summer) than in the rest of the country (64 percent in 
the winter and 61 percent in the summer). The 2019 PG&E market survey 
data also showed more ``Less Than Half Full'' loads in the Pacific 
Northwest (25 percent in the winter and 33 percent in the summer) than 
in the rest of the country (18 percent in the winter and 22 percent in 
the summer). These differences also suggest that the results of the 
2014 NEEA field study may be too limited in geographic scope to be 
considered representative of the entire United States.
    However, the national data collected by the 2019 PG&E market survey 
may better represent the United States as a whole, albeit with a 
relatively small sample size of 210 respondents. As presented by the 
California IOUs, the national sample from the 2019 PG&E market survey 
indicates that the relative proportion of very small loads (``Less Than 
Half Full'') is similar in magnitude to the relative proportion of 
``Very Full'' loads. The data indicate that in the summer months, 22 
percent of loads are less than half full, while 15 percent of loads are 
very full; and in the winter months, 18 percent of loads are less than 
half full and 16 percent of loads are very full. Given the relatively 
small sample size of this national consumer usage data, DOE is unable 
to determine at this time the representativeness of these load size 
distributions based on the provided information.
    To supplement and better understand the results provided in 
comments, DOE tested seven standard-size electric clothes dryers from 
four manufacturers, representing a range of capacities, venting 
configurations, efficiency performance, and heating technologies, to 
investigate the impact of test load size on energy use and measured 
efficiency. Table III.2 provides the characteristics of each model in 
DOE's test sample.

                        Table III.2--Characteristics of Clothes Dryers in DOE Test Sample
----------------------------------------------------------------------------------------------------------------
                                                                        Measured CEF
         Test unit             Capacity       Venting configuration         using          Heating technology
                             (cubic feet)                                appendix D2
----------------------------------------------------------------------------------------------------------------
1.........................             7.2  Vented...................            2.79  Electric Resistance.
2.........................             7.0  Vented...................            3.15  Electric Resistance.
3.........................             7.4  Vented...................            3.29  Electric Resistance.
4.........................             7.4  Vented...................            3.36  Electric Resistance.

[[Page 56621]]

 
5.........................             7.4  Vented...................            3.92  Electric Resistance.
6.........................             7.4  Ventless.................            4.45  Heat Pump.
7.........................             5.1  Ventless.................            7.77  Heat Pump.
----------------------------------------------------------------------------------------------------------------

    For each model, DOE tested five load sizes using DOE test cloth: 
3.0, 5.7, 8.45, 11.2, and 13.9 pounds. DOE conducted each test 
according to appendix D2, substituting the load size as noted. Figure 
III.2 shows the combined total energy consumed in each test cycle 
(corresponding to ECC as calculated in section 4.6 of 
appendix D2) and indicates an approximately linear relationship between 
the weight of the test load and the per-cycle energy consumption.
[GRAPHIC] [TIFF OMITTED] TR08OC21.024

    The linearity of the energy consumption relationships in Figure 
III.2 shows that if both a smaller load size and larger load size (in 
relation to the current load size) are additionally tested in order to 
calculate the energy consumption that is representative of an average 
use cycle, the lower per-cycle energy consumption associated with the 
smaller load size would essentially be entirely offset by the higher 
per-cycle energy consumption associated with the larger load size, with 
little net change to the resulting average per-cycle energy 
consumption; and thus little change to the CEF value, as compared to 
the CEF value obtained from testing with the current single DOE test 
load size. With little expected change to the CEF value when 
considering the energy consumption associated with a range of load 
sizes, DOE does not believe the additional testing would provide 
consumers with improved information that would change their purchasing 
decisions compared to the current test procedure. As such, any 
incremental benefit of testing with additional load sizes would be 
outweighed by the significant added burden that would be imposed by 
conducting such tests. For these reasons, DOE is not making any 
amendments to the test procedure requiring additional test load sizes 
at this time.
b. Test Load Bone-Dry Weight
    Section 2.7.1 of appendix D1 and appendix D2 specifies the process 
by which a test load is prepared for a compact-size clothes dryer. 
Specifically, it describes the target weight of 3.00 pounds  .03 pounds, as well as the use of energy stuffer cloths, of 
which up to five may be used, to achieve the tolerance required for the 
bone-dry test load. Section 1.5 of appendix D1 and 1.6 of appendix D2 
describe the bone-drying process.
    BSH commented that for compact-size clothes dryers, for which the 
range of acceptable bone-dry test load weight is 3.00 pounds .03 pounds, it is difficult to adjust the weight of the test load 
because, based on its experience, the average weight of an individual 
energy stuffer cloth is .037 pounds. According to BSH, this may lead to 
variability in test results. BSH recommended that the maximum allowable 
weight of the test load after the first bone-dry run should be 3.03 
pounds for compact-size clothes dryer loads, and that the test load 
weight after every bone-dry run shall be recorded. BSH also commented 
that the bone-dry definition has no maximum time limit for the bone-
drying process.

[[Page 56622]]

Without an upper time limit, BSH argued it would be possible for the 
bone-drying process to be used to reduce the weight of heavy test loads 
to meet the maximum weight limits and not solely for setting the 
baseline for the 2-percent FMC condition. BSH recommended that DOE 
require that any single bone-dry run shall not exceed 10 minutes and 15 
seconds, and that no more than four bone-dry runs may be conducted for 
a single test load, to ensure that the bone drying process is used only 
to set the baseline for the 2-percent FMC. (BSH, No. 30 at pp. 2-3)
    DOE is unaware of issues regarding achieving the bone-dry test 
weight as specified in section 1.5 of appendix D1 and section 1.6 of 
appendix D2, which both define ``bone dry'' as a condition of a load of 
test cloths which has been dried in a clothes dryer at maximum 
temperature for a minimum of 10 minutes, removed, and weighed before 
cool down, and then dried again for 10-minute periods until the final 
weight change of the load is 1 percent or less. Further, BHS did not 
explain how the bone-dry provisions could be used for a purpose other 
than establishing the bone-dry baseline. The bone-drying process is 
required to establish the baseline weight for the FMC condition, and 
setting an upper time limit to the bone-drying process as suggested by 
BHS could significantly increase test burden or require manufacturers 
to design clothes dryers with specialized drying cycles solely for 
achieving bone-drying specifications outside of the scope of consumer-
driven needs.
    Based on the preceding discussion, DOE is not amending the test 
procedure regarding acceptable bone-dry test load weight or the bone-
drying process.
c. Test Load Composition
    Section 2.6 of appendix D1 and appendix D2 specifies a test load 
composed of a pure finished bleached cloth, made with a momie or 
granite weave, which is a blended fabric of 50-percent cotton and 50-
percent polyester. Appendix D1, section 2.6.1(a); appendix D2, section 
2.6.1(a). The ``energy test cloth'' is made from material that is 24 
inches by 36 inches, hemmed to 22 inches by 34 inches, and weighs 
within 10 percent of 5.75 ounces per square yard. Appendix D1, section 
2.6.1(b); appendix D2, section 2.6.1(b). Smaller ``energy stuffer 
cloths'' are made of material that is 12 inches by 12 inches, hemmed to 
10 inches by 10 inches.\24\ Appendix D1, section 2.6.2; appendix D2, 
section 2.6.2.
---------------------------------------------------------------------------

    \24\ The test procedure specifies that the energy stuffer cloths 
are to be used to adjust the test load to achieve the proper weight, 
but that no more than five stuffer cloths may be added per test 
load.
---------------------------------------------------------------------------

    Several industry test procedures specify clothing loads for 
measuring the drying performance of clothes dryers. ANSI/AHAM's test 
procedure, HLD-1-2010, ``Household Tumble Type Clothes Dryers'' 
(``ANSI/AHAM HLD-1-2010'') specifies the use of 100-percent cotton bed 
sheets, towels, and pillowcases. The bedsheets and pillowcases are 
plain weave linen, while the towels are huckaback weave. ANSI/AHAM HLD-
1-2010, Annex A. IEC Standard 61121, Edition 4.0 2012-02, ``Tumble 
dryers for household use--Methods for measuring the performance'' 
(``IEC Standard 61121'') incorporates by reference from IEC's consumer 
clothes washer test procedure two different test loads: (1) the 
``Cotton test load,'' which comprises 100-percent cotton bed sheets, 
towels, and pillowcases consistent with ANSI/AHAM HLD-1-2010; and (2) 
the ``Synthetics/blends test load,'' which comprises pillowcases and 
buttoned men's shirts fabricated from plain weave 35-percent cotton and 
65-percent polyester fabric. IEC Standard 61121, sections 6.5.6.1-
6.5.6.2.
    Another procedure that uses a variety of test cloth materials is 
the ``Utility Test Protocol'' \25\ (``UTP'') developed by NEEA and the 
California IOUs, which utilities and efficiency advocates have 
encouraged DOE to consider as a model for implementing revised test 
loads. (California IOUs, No. 29 at pp. 1-3) The UTP is an investigative 
test method that was developed based on data collected in 2012 as part 
of the 2014 NEEA field study. It consists of one test using the 
appendix D2 test procedure and four supplemental tests that use a range 
of test load compositions, test load sizes, and cycle settings.\26\ The 
UTP generates a combined energy metric referred to as the Utility 
Combined Energy Factor (``UCEF''), comprised of a weighted average of 
each model's energy efficiency performance on each of the five tests, 
using weighting factors determined by a best fit between lab and field 
test data.
---------------------------------------------------------------------------

    \25\ Available at https://neea.org/resources/energy-efficiency-test-procedure-for-residential-clothes-dryers-1.
    \26\ The ``Utility Test Protocol'' consists of a series of five 
tests: (1) Using the appendix D2 test method; (2) using a 4.22-pound 
``real-world'' load with the medium temperature setting and ``eco'' 
mode deactivated; (3) using a 16.9-pound ``real-world'' load with 
the medium temperature setting and ``eco'' mode deactivated; (4) 
using an 8.45-pound ``real-world'' load using the most efficient 
setting configuration possible; and (5) using an 8.45-pound ``real-
world'' load using settings that achieves the fastest rate of drying 
possible.
---------------------------------------------------------------------------

    NEEA, the Joint Commenters, and CEC urged DOE to consider adopting 
test loads with material more similar to real clothing, stating that 
cloth material has a significant impact on clothes dryer efficiency. 
NEEA and the Joint Commenters recommended that DOE consider adopting an 
optional test procedure that uses a test load with varied size, 
thickness, and fabric types, such as the IEC or AHAM test loads, which 
commenters suggested would be more representative. The Joint Commenters 
suggested that DOE monitor the IEC test procedure development. CEC 
referenced a Pacific Northwest National Laboratory (``PNNL'') study 
\27\ that showed differences in load dryness and drying rate between 
the DOE test load and the AHAM test load. CEC stated that the AHAM test 
load, consisting of bed sheets, pillowcases, and hand towels, is less 
uniform and more challenging to dry, and that PNNL found that the AHAM 
test load had a higher moisture content than the DOE test load as the 
clothes dryer entered automatic cycle termination. NEEA emphasized the 
impact of test cloth material on heat-pump clothes dryer performance 
particularly and also stated that appendix D2 results for both high 
efficiency and low efficiency models aligned well with the results for 
test loads with using fabrics of differing weights and materials, but 
failed to distinguish between moderately efficient models. (NEEA, 
Public Meeting Transcript, No. 23 at pp. 18, 20, 22-23, 106-109, 117-
118; Joint Commenters, No. 34 at p. 2; CEC, No. 31 at p. 2)
---------------------------------------------------------------------------

    \27\ TeGrotenhuis, W, PNNL, Clothes Dryer Automatic Termination 
Sensor Evaluation, September 2014.
---------------------------------------------------------------------------

    Energy Solutions commented that the thickness of the test cloth has 
a large impact on clothes dryer performance, regardless of type of 
material used. Energy Solutions suggested that DOE take cloth thickness 
into consideration when balancing representativeness and repeatability 
in the test procedure. (Energy Solutions, Public Meeting Transcript, 
No. 23 at pp. 21-22)
    GEA commented that there is inherent variation in natural fibers of 
a single uniform cloth, even within specially manufactured DOE test 
cloth lots, that creates variability that impacts the reliability of 
the DOE test procedure. AHAM claimed that the summary of test data from 
the 2019 PG&E testing, prepared by Energy Solutions,\28\ shows that 
changing the test load composition

[[Page 56623]]

as indicated by the PG&E testing will introduce significant additional 
variation, beyond that of the current DOE test cloth. AHAM stated that 
test procedures with significant variation do not provide uniform or 
reliable results for the purpose of allowing consumers to make informed 
purchase decisions based on energy use/efficiency because the results 
of a highly variable test procedure are not comparable within or across 
brands. AHAM and GEA asserted that the 2014 NEEA field study provides 
an insufficient basis on which to amend the test procedure, and the 
concept of a ``real-world'' test load that would significantly increase 
test variation is incompatible with the requirement that test 
procedures be ``reasonably designed,'' in accordance with EPCA (42 
U.S.C. 6293(b)(3)). AHAM also stated that data collected on test load 
composition and consumer use would need to be national to be 
representative or to inform rulemaking decisions, because clothing 
washed and dried varies by climate and season. Without such data, AHAM 
maintains that it is impossible and inappropriate to determine or 
change the average use/cycle in a test procedure. AHAM noted that the 
DOE clothes dryer test procedure, including the test load composition, 
is based on consumer use studies and changing the test would require 
showing that something has changed with regard to consumer behavior or 
that more accurate consumer use study data are available. AHAM asserted 
that the 2014 NEEA field study is not a sufficient basis upon which to 
make changes to the clothes dryer test procedure, namely the test load 
composition, given that it was conducted only in the Pacific Northwest 
and only during the winter season, and therefore not representative of 
the laundry composition of the entire nation throughout the year. 
(AHAM, Public Meeting Transcript, No. 23 at pp. 98-99 AHAM, No. 33 at 
pp. 3-4; GEA, No. 37 at p. 2)
---------------------------------------------------------------------------

    \28\ PG&E Residential Dryer Testing, Residential Clothes Dryer 
Test Protocol Investigation, Prepared by David Jagger, Energy 
Solutions (Sept. 6, 2019), Docket No. EERE-2014-BT-TP-0034; RIN 
1904-AD46; ID EERE-2014-BT-TP-0034-0024 (Posted Sept. 30, 2019).
---------------------------------------------------------------------------

    Altering the test cloth composition would require further 
investigation into a suitable representative replacement. The data 
provided by the 2014 NEEA field study (discussed in section III.D.1.a.i 
of this document) are insufficiently representative to justify the 
significant cost of developing and transitioning to a new type of test 
cloth, due to the limited sample size, region, and time of year during 
which the studies were conducted, as discussed previously in AHAM's 
comment.
    As explained previously, DOE is unaware of any new information that 
would alter its previous determination, that testing using the IEC and 
AHAM test loads is less representative than testing with the DOE test 
load, to warrant any modifications to the DOE test procedure at this 
time. 78 FR 49608, 49620 (Aug. 14, 2013). DOE therefore is not making 
any changes to the test cloth material requirements in appendix D1 and 
appendix D2 at this time.
    However, in light of the feedback received regarding test load 
composition, DOE will continue to evaluate the representativeness of 
test results obtained through the use of the current test load 
composition requirements in the DOE test procedure. DOE will also 
continue to monitor development of industry standards and other efforts 
related to test load composition.
d. Test Cycle Selections
    Section 3.3.2 of appendix D2 specifies that for automatic 
termination control clothes dryers, the ``normal'' program shall be 
selected for the test cycle. For clothes dryers that do not have a 
``normal'' program, the cycle recommended by the manufacturer for 
drying cotton or linen shall be selected. If the drying temperature 
setting can be chosen independently of the program, it shall be set to 
the maximum. If the dryness level setting can be chosen independently 
of the program, it shall be set to the ``normal'' or ``medium'' dryness 
level setting. After the completion of the test cycle, the test load is 
removed and weighed. If the FMC is greater than 2 percent, the test is 
considered invalid and a new run shall be conducted using the highest 
dryness level setting.
    Industry standards address cycle selection differently from the DOE 
test procedure. Section 4.5.1 of ANSI/AHAM HLD-1-2010 specifies that 
the test cycle be run using the maximum temperature setting without 
allowing the clothes dryer to advance into the cool down period. If the 
required FMC specified in the industry standard (6 percent) cannot be 
met using this setting, a new test run must be conducted using a 
different user-selected setting that will achieve the target FMC, as 
described in section 4.5.6 of ANSI/AHAM HLD-1-2010. IEC Standard 61121 
requires that the test cycle for a given load composition be run using 
the cycle program and settings specified in the manufacturer's 
instructions to achieve a target FMC, which is based on the test load 
composition; in the absence of any instructions from the manufacturer, 
or if the specified cycle program and settings do not achieve the 
required FMC, the test shall be run using a user-selected combination 
of cycle program and settings that will achieve the required FMC, as 
specified in section 8.2.2 of IEC Standard 61121 .
    In response to the July 2019 NOPR, NEEA, the Joint Commenters, and 
the California IOUs urged DOE to consider including additional test 
cycle selections in the test procedure. NEEA and the California IOUs 
suggested that DOE should capture the impact of ``eco'' mode settings, 
since they asserted that the ``eco'' mode settings are often only 
enabled by default on the ``normal'' cycle. The California IOUs cited 
the 2019 PG&E testing and reported that 15 clothes dryers among the 
2019 PG&E testing sample of 22 had an ``eco'' mode that was active by 
default on the ``normal'' setting, but not active by default on other 
cycle programs. For some units, the ``eco'' setting was not a 
selectable option during a ``high'' or ``low'' temperature cycle. The 
California IOUs further commented that PG&E testing at an independent 
lab in accordance with appendix D2 with and without the ``eco'' mode 
yielded results that showed changes in CEF rank order, performance, and 
cycle time compared to the average when the ``eco'' setting is on or 
off. NEEA and the California IOUs recommended that DOE add additional 
cycle selections to the test procedure to mitigate the impact of 
``eco'' mode settings, and NEEA stated that this should be accomplished 
by adding a ``fast test cycle'' (i.e., a cycle with a shorter duration) 
at the standard load size. Based on the 2014 NEEA field study and 
another NEEA field study conducted in 2017 that looked exclusively at 
load sizes and settings for the most efficient clothes dryers, NEEA 
asserted that 20 percent to 60 percent of all loads monitored were 
dried using the shortest cycle time available on the machine. NEEA and 
the Joint Commenters commented that heat pump clothes dryers 
particularly suffer efficiency losses on shorter cycle time settings, 
since much of their efficiency gain is obtained by drying the clothes 
at a lower temperature for a longer period of time, resulting in 
changes in efficiency rank order when a shorter cycle that uses more 
electric resistance heat is tested. The Joint Commenters also noted 
that some clothes dryers default to the most recent cycle used, which 
could lead to consumers not using the normal cycle for extended periods 
of time, meaning that testing additional cycle selections could 
increase representativeness. (NEEA, No. 38 at pp. 3, 12-;16, 18; Joint 
Commenters, No. 34 at p. 2; California IOUs, No. 29 at pp. 15-16)
    AHAM commented that it is unclear whether the data presented in the 
2014

[[Page 56624]]

NEEA field study are an accurate reflection of consumer cycle settings, 
as the study relied on the consumers to log their data, which may not 
be accurate. AHAM further asserted that without knowledge of the 
controls of the monitored clothes dryers, it is difficult to draw 
conclusions regarding the frequency of cycle selections, and those 
cycle selections could be impacted by the type of clothing, which was 
potentially heavier during the winter months. AHAM asserted that the 
data from the 2014 NEEA field study may not be representative of 
consumer use across the entire United States over the course of a year 
and, on their own, are not a sufficient basis upon which to justify 
significant changes to the test procedure. (AHAM, No. 33 at p. 3)
    While the comments recommending the inclusion of additional test 
cycle selections suggest that changing the cycle setting could change 
efficiency rank order, DOE did not receive sufficient data and 
information to confirm that the current test selections are 
unrepresentative of consumer use and that other or additional test 
selections are warranted. DOE notes that the data presented from the 
2014 NEEA field study may not be representative of annual national 
clothes dryer usage, and the 2019 PG&E market survey showed differences 
between the Pacific Northwest and the rest of the country in test cycle 
selections, as discussed in section III.D.a.iv of this final rule. 
Therefore, DOE maintains its prior determination that the ``normal'' 
cycle test in appendix D2 and the required temperature and dryness 
settings are appropriately representative. See 78 FR 49608, 49612-49613 
(Aug. 14, 2013). For these reasons, DOE maintains the current approach 
of requiring a single cycle test, in section 3.3 of appendix D1 and 
appendix D2.
e. Moisture Content
i. Initial Moisture Content
    Sections 2.7.1 and 2.7.2 of appendix D1 specify to extract water 
from the energy cloths for a test load for a compact-size dryer load 
and standard-size dryer load, respectively, so that the IMC is between 
54.0 and 61.0 percent of the bone-dry weight of the test load. Sections 
2.7.1 and 2.7.2 of appendix D2 specify that the IMC of energy cloths 
for a compact-size dryer load and standard-size dryer load, 
respectively, after extraction must be between 52.5 and 57.5 percent of 
the bone-dry weight of the test load. Appendix D2 also provides 
additional instruction that any final mass adjustments to achieve the 
specified IMC for the energy test cycle (57.5 percent0.33 
percent) are made by uniformly adding water to each test cloth using a 
spray bottle. Appendix D2, sections 2.7.1 and 2.7.2.
    AHAM recommended that the appendix D1 test load IMC (i.e., 54.0 to 
61.0 percent) should be aligned with that of appendix D2 (i.e., 57.5 
percent  0.33 percent). AHAM also recommended specifying in 
appendix D1 the same method for test cloth IMC adjustment that is 
described in appendix D2 (i.e., add water uniformly distributed among 
all of the test clothes in a very fine spray using a spray bottle). 
AHAM commented that aligning the method in appendix D1 with that in 
appendix D2 would make it easier for test technicians who conduct both 
tests. AHAM also suggested that water temperature has a significant 
effect on drying performance, which can cause test variation. AHAM 
suggested that the test procedure specify that the temperature of the 
spray bottle water must be 60 [deg]F5 [deg]F, with a 
nominal target of 60 [deg]F. (AHAM, No. 33 at pp. 12-13)
    Appendix D1 requires, in addition to an IMC of 54.0 to 61.0 percent 
(i.e., 57.5 percent 3.5 percent), an FMC between 2.5 and 
5.0 percent for all clothes dryers. Appendix D1, sections 2.7.1, 2.7.2, 
and 3.3. The measured test cycle energy consumption is then normalized 
to calculate the energy consumption required to dry the test load from 
exactly 57.5-percent IMC to 2-percent FMC, which is representative of 
clothes dryers currently on the market and of the maximum consumer-
accepted FMC. Appendix D1, section 4.1. In the August 2013 Final Rule, 
DOE reduced the tolerance on the IMC to 0.33 percent to produce 
repeatable results specifically for clothes dryers with automatic 
termination controls, for which no such normalization is required, 
because the test cycle is run to completion. 78 FR 49608, 49618 (Aug. 
14, 2013). Because appendix D1 does not specify running any test cycles 
to completion and instead applies normalization of the test cycle 
energy consumption for both timer and automatic termination control 
clothes dryers, the IMC requirements for appendix D1 do not require the 
more stringent tolerance of those in appendix D2, avoiding increased 
test burden associated with test load conditioning. As such, DOE is not 
amending the required IMC in appendix D1.
    However, DOE agrees with AHAM that appendix D1 would benefit from 
the additional direction for adding water to the test load using a 
spray bottle as provided in appendix D2. The previous version of 
appendix D1 does not instruct what to do if the test load IMC is too 
low upon removing the test load from the extractor. A test laboratory 
may interpret, in this case, that the test load must be re-wet and re-
spun until an acceptable IMC is achieved, which would add testing 
burden. Appendix D2 provides means to increase the IMC of such a test 
load in a much less burdensome manner through the use of a spray 
bottle.
    To quantify the burden associated with test cloth preparation, DOE 
investigated the repeatability of the extractor to achieve a specified 
moisture content. In accordance with appendix D1 and appendix D2, DOE 
prepared three standard-size test loads and two compact-size test 
loads, weighed before and after the extractor cycle. For the three 
standard-size test loads, two test loads were prepared twice and one 
test load was prepared once, for a total of five extractor tests. For 
the two compact-size test loads, both were prepared twice, for a total 
of four extractor tests. The North Star Engineered Products Inc. 
(formerly Bock) Model 215 extractor, specified in section 3.2 of the 
DOE clothes washer test procedure at 10 CFR part 430, subpart B, 
appendix J3 (``appendix J3''), was used in this investigation, with the 
same extractor spin setting selected for all tests. DOE expects that 
this extractor is representative of typical clothes dryer testing 
equipment at commercial test laboratories. The IMC values of this 
investigation are shown in Table III.3. Note that these IMC values were 
recorded prior to the use of a spray bottle according to the method in 
appendix D2.

                                           Table III.3--Water Extraction Results From Extractor Investigation
--------------------------------------------------------------------------------------------------------------------------------------------------------
            Extractor test                       Test load                  % IMC (no spray bottle used)          Within range defined by appendix D1?
--------------------------------------------------------------------------------------------------------------------------------------------------------
1....................................  Standard #1..................  53.13...................................  No.
--------------------------------------------------------------------------------------------------------------------------------------------------------
2....................................  Standard #2..................  55.30...................................  Yes.

[[Page 56625]]

 
3....................................                                 55.25...................................  Yes.
--------------------------------------------------------------------------------------------------------------------------------------------------------
4....................................  Standard #3..................  54.20...................................  Yes.
5....................................                                 53.63...................................  No.
--------------------------------------------------------------------------------------------------------------------------------------------------------
Standard-Size Test Load Range.......................................  53.1-55.3...............................  ........................................
--------------------------------------------------------------------------------------------------------------------------------------------------------
Appendix D1 Range...................................................  54.0-61.0...............................  ........................................
--------------------------------------------------------------------------------------------------------------------------------------------------------
5....................................  Compact #1...................  57.51...................................  Yes.
6....................................                                 56.77...................................  Yes.
--------------------------------------------------------------------------------------------------------------------------------------------------------
7....................................  Compact #2...................  56.81...................................  Yes.
8....................................                                 57.51...................................  Yes.
--------------------------------------------------------------------------------------------------------------------------------------------------------
Compact-Size Test Load Range........................................  56.8-57.5...............................  ........................................
--------------------------------------------------------------------------------------------------------------------------------------------------------
Appendix D1 Range...................................................  54.0-61.0...............................  ........................................
--------------------------------------------------------------------------------------------------------------------------------------------------------

    For all but two test loads, the extractor produced an IMC within 
the range of 54.0 to 61.0 percent, as specified in appendix D1; 
however, two standard-size test loads had IMCs less than 54 percent 
(the minimum of the range defined in appendix D1). These results 
confirm that despite the wider range of target IMC values defined in 
appendix D1 compared to those in appendix D2, the extractor can 
sometimes lead to an IMC value lower than the target IMC range in 
appendix D1. Without the moisture content adjustments provided by use 
of a spray bottle as specified in appendix D2, the previous language of 
appendix D1 suggests that test loads prepared under appendix D1 may 
require re-wetting and re-spinning.
    As summarized, DOE is amending appendix D1 to allow the use of a 
spray bottle as necessary following the extractor run to achieve the 
required IMC range. This will provide a reliable, validated, and 
burden-reducing approach to ``fine-tune'' IMC values that fall just 
below the target range, such as those seen in DOE's extractor 
investigation. This additional direction provides a means to achieve 
allowable IMC without the need to re-wet and re-spin the test load if 
the IMC achieved by the extractor is below the target range of IMC.
    DOE is not specifying the temperature of the spray bottle water 
given the amount of time and air exposure that the test load encounters 
while being spun in the extractor, sprayed, and loaded into the clothes 
dryer. According to DOE investigative testing, the moisture content 
provided by the spray bottle is approximately 0.03 percentage points 
with each spray, up to a maximum of 5.33 percentage points that may be 
added in the load under appendix D2 to achieve the specified moisture 
content of the test load of 57.5 0.33 percent. Recognizing 
that without such specification, the temperature of water in the spray 
bottle could be closer to room temperature (i.e., only slightly higher 
than AHAM's suggestion of 60 [deg]F), it is implausible that the 
temperature of the water in the spray bottle would change the 
temperature of the load enough to impact the dryer performance.
    In summary, DOE is aligning appendix D1 with appendix D2 by 
specifically providing for the use of a spray bottle to add water to 
test loads that are below the acceptable IMC range minimum of 54.0 
percent following the extractor run. DOE is not adding a temperature 
specification for the spray bottle water.
ii. Final Moisture Content
    Section 3.3.1 of appendix D2 specifies that for timer clothes 
dryers, the test load is dried until the FMC is between 1 and 2.5 
percent of the bone-dry weight of the test load. The measured energy 
consumption is then normalized to determine the energy consumption 
required to dry the test load to 2-percent FMC, with a field use factor 
applied to account for the over-drying energy consumption, in section 
4.1 of appendix D2. For automatic termination control clothes dryers, 
section 3.3.2 of appendix D2 specifies that a test is considered valid 
if the FMC of the test load is 2 percent or less. DOE did not propose 
amending the FMC requirement of appendix D2 in the July 2019 NOPR.
    The California IOUs stated that the 2-percent FMC under the DOE 
test conditions is appropriate, though suggested that a higher FMC may 
be appropriate when accounting for additional test conditions, such as 
changes in clothes dryer settings or a more realistic clothes dryer 
load. In the absence of any changes to these settings or test load, the 
California IOUs recommended maintaining the current 2-percent FMC. 
(California IOUs, No. 29 at p. 20)
    Samsung, AHAM, BSH, and GEA commented that requiring an FMC of 2 
percent or less promotes over-drying and unnecessary additional energy 
use; and further, because clothes that are over-dried will typically 
re-absorb moisture from ambient air during cool-down phases of the 
drying cycle and after termination of the drying cycle, a higher FMC, 
between 5 percent and 8 percent, results. Samsung suggested a 4-percent 
FMC requirement, corresponding to estimated moisture up-take from bone-
dry conditions on the 100 percent cotton IEC test load. AHAM and GEA 
suggested that DOE adopt an FMC range of 3 to 4 percent, with a target 
of 4 percent. (AHAM, No. 33 at pp. 5, 12; BSH, No. 30 at pp. 1-2, 4; 
GEA, No. 37 at p. 2; Samsung, No. 36 at p. 2)
---------------------------------------------------------------------------

    \29\ UL 2158 can be accessed at https://standardscatalog.ul.com/standards/en/standard_2158_4.
---------------------------------------------------------------------------

    BSH and AHAM also referenced the December 2015 Underwriters 
Laboratory (``UL'') clothes dryer safety requirement in UL 2158, 
``North American Dryer Safety Standard'' that the requirement of a 
cool-down period if the temperature at the clothes dryer's lint filter 
exceeds 131 [deg]F (55 [deg]C) at the end of the drying cycle as a 
source of difficulty for ventless condensing clothes dryers in meeting 
the current 2-percent FMC requirement in appendix D2.\29\ BSH commented 
that due to the drying

[[Page 56626]]

process of a condensing clothes dryer with a closed-loop process air 
system, the FMC increases rapidly during the cool-down period.\30\ AHAM 
and BSH asserted that due to the UL 2158 requirement, attaining an FMC 
of 2 percent on condensing clothes dryers is impractical, and without 
costly design changes and adjustments to the test procedure, ventless 
condensing clothes dryers cannot consistently meet both the new UL 2158 
safety limit and the current FMC requirement. BSH suggested a separate 
FMC target of 4 percent for ventless clothes to compensate for the UL 
2158 safety requirement and otherwise agreed with the current 2-percent 
FMC requirement for vented clothes dryers. (AHAM, No. 33 at pp. 5, 12; 
BSH, No. 30 at pp. 1-2, 4)
---------------------------------------------------------------------------

    \30\ A ventless condensing clothes dryer recirculates the air 
used to remove moisture from the load during the entire drying 
cycle. The clothes dryer uses ambient air or cold water in a heat 
exchanger to condense the moisture from the air in the drum. The dry 
air exiting the drum is then reheated and recirculated back into the 
drum.
---------------------------------------------------------------------------

    AHAM and BSH also recommended that DOE specify a time limit in 
which the test load must be weighed after stopping the test cycle to 
minimize test variation and moisture reabsorption. BSH recommended that 
the test load be weighed within 10 seconds of the drying cycle 
termination, and AHAM recommended that the test load be weighed 
immediately after and within a maximum of 2 minutes after cycle 
termination. (AHAM, No. 33 at pp. 5, 12; BSH, No. 30 at pp. 1-2, 4; 
GEA, No. 37 at p. 2; Samsung, No. 36 at p. 2)
    The current 2-percent FMC requirement using the DOE test cloth was 
adopted as representative of approximately 5-percent FMC for ``real-
world'' clothing, based on data submitted in a joint petition for 
rulemaking.\31\ DOE determined in the August 2013 Final Rule that the 
specified 2-percent FMC using the DOE test load was representative of 
consumer expectations for dryness of clothing in field use. 78 FR 
49608, 49620-49622, 49610-49611 (Aug. 14, 2013).
---------------------------------------------------------------------------

    \31\ The petition was submitted by AHAM, Whirlpool Corporation, 
General Electric Company, Electrolux, LG Electronics, Inc., BSH, 
Alliance Laundry Systems, Viking Range, Sub-Zero Wolf, Friedrich A/
C, U-Line, Samsung, Sharp Electronics, Miele, Heat Controller, AGA 
Marvel, Brown Stove, Haier, Fagor America, Airwell Group, Arcelik, 
Fisher & Paykel, Scotsman Ice, Indesit, Kuppersbusch, Kelon, and 
DeLonghi, American Council for an Energy Efficient Economy, 
Appliance Standards Awareness Project, Natural Resources Defense 
Council, Alliance to Save Energy, Alliance for Water Efficiency, 
Northwest Power and Conservation Council, and Northeast Energy 
Efficiency Partnerships, Consumer Federation of America and the 
National Consumer Law Center. See Docket No. EERE-2011-BT-TP-0054, 
No. 3.
---------------------------------------------------------------------------

    DOE reviewed the UL 2158 safety requirements and noted that Clause 
12 of UL 2158 requires a cool-down period if the drying cycle air 
temperature exceeds 131 [deg]F at the end of the drying cycle, as 
measured at the first lint filter. This cool-down period is required to 
reduce the temperature of the clothes load to a suitable level before 
the user is alerted that the drying cycle has ended. As described in 
Clause 12.1 of UL 2158, this safety standard is in place to reduce the 
risk of spontaneous ignition of the clothes load. DOE acknowledges that 
the air temperature limit specified by UL 2158 (i.e., requiring a cool-
down period to ensure the temperature at the first lint filter at the 
end of the drying cycle does not exceed 131 [deg]F) may result in 
moisture regain by the load. DOE notes that the safety requirement 
regarding cool-down periods was introduced in the fourth edition of UL 
2158 and has been effective since December 2015. In its internal 
testing since that time, DOE has not identified any systemic problems 
with any clothes dryer types, including ventless condensing clothes 
dryers, being able to achieve the required FMC of 2 percent or less, 
such that amendments to the test procedure would be warranted.
    Furthermore, commenters did not provide any test results or data to 
demonstrate that the maximum 2-percent FMC limit is impracticable or 
unachievable given the UL 2158 safety requirements. DOE also notes that 
multiple ventless condensing clothes dryers from various manufacturers 
have been certified to DOE under the appendix D2 test procedure since 
the introduction of the safety standard in 2015.
    Based on the preceding discussion, DOE is not amending the FMC 
requirement for either appendix D1 or appendix D2 in this final rule.
    Regarding a time limit in which the test load must be weighed after 
stopping the test cycle, section 3.3 of previous appendix D1 and 
sections 3.3.1 and 3.3.2 of previous appendix D2 required that the test 
load be weighed ``after stopping the test cycle'' (for timer clothes 
dryers) or ``after the completion of the test cycle'' (for automatic 
termination control clothes dryers). To better quantify the potential 
reabsorption effects associated with the interval between completing 
the clothes dryer test cycle and weighing the test cloth, DOE tested 
seven clothes dryers according to appendix D2, with five different time 
periods for weighing the test cloth after termination of the drying 
cycle. During the waiting period, the test cloth remained in the 
clothes dryer drum with the door closed. These time periods ranged from 
weighing the test cloth as immediately as practicable after termination 
of the drying cycle to 30 minutes after termination of the drying 
cycle. DOE acknowledges that test load FMC may change after completion 
of the clothes dryer cycle, generally regaining moisture; however, 
testing found that the moisture content for certain units decreased as 
the waiting period increased, relative to the immediate weighing.
    Figure III.4 shows the change in FMC measured at varying waiting 
periods relative to the FMC recorded immediately upon removal of the 
test load after the drying cycle termination.

[[Page 56627]]

[GRAPHIC] [TIFF OMITTED] TR08OC21.025

    As shown in Figure III.4, moisture regain and loss relative to the 
immediately measured FMC were observed at the various time periods, 
with more significant changes in FMC as the time periods increased. At 
the 5-minute waiting period, however, variation in FMC was consistently 
within 0.1 percentage points of the FMC recorded immediately after the 
drying cycle terminated for all units tested. According to these 
results, and in order to ensure repeatability, reproducibility, and 
representativeness of the FMC measurement, a time limit of 5 minutes, 
within which the test load must be weighed, appears appropriate to 
minimize variability in FMC from the value immediately upon completion 
of the cycle.
    As best practice would result in weighing the test load without any 
unnecessary delay, and DOE has no indication that testing is currently 
conducted inconsistent with best practices, DOE does not expect any 
increase in test burden associated with adoption of a reasonable time 
limit on weighing the test cloth after termination of a drying cycle to 
ensure repeatable, reproducible, and representative results. Therefore, 
to limit any potential variability in the test procedure associated 
with moisture reabsorption following the test cycle, DOE is amending 
section 3.3 of appendix D1 and sections 3.3.1 and 3.3.2 of appendix D2 
to specify that FMC must be recorded within 5 minutes following the 
termination of the drying test cycle.
iii. Final Moisture Content Requirements for Automatic Termination 
Control Dryers
    Section 3.3.2 of appendix D2 specifies that for automatic 
termination control dryers, the clothes dryer is operated until the 
completion of the programmed cycle, including the cool down period. The 
test procedure provides that, if the FMC is greater than 2 percent, the 
test is invalid and a new run must be conducted using the highest 
dryness level setting. In guidance issued on January 10, 2017 (``2017 
Guidance''),\32\ DOE provided its interpretation that the 2-percent FMC 
threshold for a valid test also applies to a test run conducted using 
the highest dryness level setting, if required. As explained in the 
2017 Guidance, DOE's interpretation that the 2-percent final moisture 
content threshold for a valid test should apply to all test cycles 
conducted according to section 3.3.2 of Appendix D2, including test 
runs using the highest 2 dryness level setting, is consistent with the 
EPCA requirements that test procedures must be ``reasonably designed to 
produce test results'' that measure energy use ``during a 
representative average use cycle.'' 42 U.S.C. 6293(b)(3). Based on the 
information presented during the prior rulemaking, during the 
representative average use of a clothes dryer, clothes are dried to an 
FMC that is equivalent to 2-percent FMC in the DOE test load.
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    \32\ Clothes Dryer Final Guidance issued January 10, 2017. 
Available at www1.eere.energy.gov/guidance/detail_search.aspx?IDQuestion=665&pid=2&spid=1.
---------------------------------------------------------------------------

    DOE noted in the July 2019 NOPR that, as part of the August 2013 
Final Rule, interested parties submitted a joint comment presenting 
test results that demonstrate that an FMC of 2 percent using the DOE 
test cloth is representative of the consumer-accepted dryness level 
after completion of a drying cycle. 84 FR 35484, 35497 (July 23, 2019); 
see also 78 FR 49608, 49614 (Aug. 14, 2013). DOE agreed with this 
conclusion and adopted provisions that specify that a test conducted on 
the ``normal'' or ``medium'' dryness setting is considered valid only 
if the FMC is 2 percent or lower. 78 FR 49608, 49621, 49624 (Aug. 14, 
2013).
    The California IOUs and the Joint Commenters supported DOE's 
clarification that the second test following a failed first test in 
which the clothes dryer did not achieve an FMC less than or equal to 2 
percent should be held to the same FMC requirements as the first test. 
The California IOUs stated that the second test should not provide a 
``loophole,'' whereby a unit could fail the first test and then use the 
results of the second test regardless of the FMC. The California IOUs 
suggested that without this consistency in test procedure and results, 
clothes dryers that are certified to the second test would not be 
comparable to those that passed the first test. (California IOUs, No. 
29 at p. 20; Joint Commenters, No. 34 at p. 3)
    AHAM and Whirlpool expressed concern that it is unclear how

[[Page 56628]]

verification and enforcement testing would address the requirement that 
a second test run must meet the required FMC. They suggested that the 
existing test procedure variation could be enough to cause false 
findings of non-compliance and may result in a large number of test 
procedure waiver requests. Whirlpool stated that this requirement would 
lead manufacturers to conservatively over-dry loads to well below 2-
percent FMC, which wastes energy, instead of using the 2-percent FMC as 
a design target rather than an enforceable performance measure. 
Whirlpool also suggested that the CEF in the test run with highest 
dryness level be used regardless of FMC, as Whirlpool asserted that 
market forces would ensure manufacturers do not intentionally design 
clothes dryers with unreasonably high FMC. AHAM suggested raising the 
FMC for all test runs to accommodate concerns regarding non-compliance 
and test procedure variation. (AHAM, Public Meeting Transcript, No. 23 
at pp. 38-39; AHAM, No. 33 at pp. 5-6; Whirlpool, No. 32 at p. 2)
    GEA suggested that there should be no FMC requirement for a second 
run test under the appendix D2 procedure. GEA noted that the second 
test run is already performed at the maximum dryness setting, and the 
clothes dryer is, therefore, subject to a higher performance condition 
and corresponding increased energy usage. GEA suggested that using the 
highest dryness setting for the second run ensures appropriate energy 
usage by a compliant clothes dryer regardless of the FMC, as the 
clothes dryer is unable to use any more energy for the selected cycle 
(given that the highest dryness setting was selected). GEA further 
commented that any remaining moisture in clothing after a cycle is 
complete on the highest dryness setting is a performance concern, and 
not an energy efficiency concern, and is therefore outside the scope of 
the appliance standards program as established under EPCA. (GEA, No. 37 
at pp. 2-3)
    As discussed, the 2-percent FMC requirement was developed through 
collaboration with, and consideration of data submitted by, interested 
parties as part of the August 2013 Final Rule. 78 FR 49608, 49614 (Aug. 
14, 2013) Interested parties have not presented any data or information 
since then that would suggest changes in consumer expectations of 
dryness levels. Therefore, DOE continues to agree with the conclusion 
from the August 2013 Final Rule that an FMC of 2 percent using the DOE 
test cloth is representative of the consumer-accepted dryness level 
after completion of a drying cycle. Thus, a test that does not produce 
an FMC of 2 percent or less would not be reflective of representative 
energy use, in that FMC values at or below this threshold represent 
consumer-accepted dryness.
    DOE notes that clothes dryer models are certified to DOE and 
available on the market representing the entire range of venting 
configurations (vented and ventless), capacity categories (standard and 
compact), product configurations (stand-alone clothes dryer and 
combination washer/dryer), energy sources (120V electric, 240V 
electric, and gas), and drying technologies (electric resistance, 
water-cooled condensing, air-cooled condensing, and electric heat pump) 
from multiple manufacturers within each product attribute. The range of 
available product offerings indicates the ability to achieve a 2-
percent FMC across the entire spectrum of clothes dryer design 
characteristics currently available on the market. Furthermore, DOE has 
not received any waiver requests, either before or after publishing the 
2017 Guidance, regarding an inability to achieve an FMC value of 2 
percent or less.
    DOE further notes that 2-percent FMC is not a design ``target,'' 
but rather a maximum threshold. Any FMC value of 2 percent or less 
(i.e., 0-2 percent) would represent a valid test. DOE has observed in 
its testing FMC values spanning the full range of 0-2 percent. Table 
III.4 shows the range in FMC values from DOE's testing of 30 different 
consumer clothes dryers under appendix D2 at a normal dryness setting. 
These units spanned multiple manufacturers, product classes, 
capacities, and drying technologies.

                Table III.4--FMC Ranges From DOE Testing
------------------------------------------------------------------------
                                                             Number of
                      FMC range (%)                            units
------------------------------------------------------------------------
0-0.5...................................................               3
0.5-1.0.................................................               8
1.0-1.5.................................................              10
1.5-2.0.................................................               9
------------------------------------------------------------------------

    In summary, drying to an FMC of 2 percent or less using the DOE 
test cloth is representative of the consumer-accepted dryness level of 
a clothing load after completion of a drying cycle. The prevalence of 
certified consumer clothes dryer models spanning the entire spectrum of 
design characteristics indicates no inherent inability to achieve an 
FMC of 2 percent or less for any clothes dryer type currently available 
on the market. For these reasons, as supported by the preceding 
discussion, DOE is amending appendix D2 as proposed to specify that the 
2-percent FMC requirement applies to all appendix D2 test runs (i.e., 
including the second test run conducted using the highest dryness level 
setting, if required). If the basic model under test fails to achieve 
an FMC of 2 percent or less when tested at the highest dryness level 
setting, the measured energy consumption of the clothes dryer would not 
reflect a representative average use cycle, since it would not have 
dried the clothing to a consumer-accepted dryness level. Such test 
results may not be used for certification of compliance with energy 
conservation standards.
    Finally, in the July 2019 NOPR, DOE also proposed to amend the 
nomenclature of section 4.1 through section 4.4 of appendix D2 to 
clarify that the measured energy consumption values represented by 
Ece, Ege, Egg, and Ecg, 
respectively, reflect the energy required to achieve an FMC of 2 
percent or less. 84 FR 35484, 35496-35497 (July 23, 2019).
    Given that there were no comments or concerns with the nomenclature 
proposed in the July 2019 NOPR, in this final rule DOE is amending the 
nomenclature of section 4.1 through section 4.4 of appendix D2 as 
proposed in the July 2019 NOPR.
f. Annual Drying Cycles and Hours Per Year
    Section 4.5 of appendix D1 and appendix D2 assigns the 
representative average use for clothes dryers at 283 drying cycles per 
year. This estimate was developed based on data provided by the 2005 
Energy Information Administration's ``Residential Energy Consumption 
Survey'' (``RECS''). 76 FR 972, 1010 (Jan. 6, 2011). In the 2019 TP 
NOPR, DOE did not propose an updated value for the annual drying cycles 
and hours per year, declining to make changes based on a limited field 
study conducted by NEEA. 84 FR 35484, 35492 (July 23, 2019). DOE noted 
that its current estimate was developed based on data from the most 
recent version of RECS at the time the cycles-per-year value was 
established. 84 FR 35484, 35491 (July 23, 2019). DOE stated that it was 
continuing to seek data regarding the cycles per year. 84 FR 35484, 
35492, 35504 (July 23, 2019).
    AHAM commented that the 2015 version of RECS indicates that 238 
clothes dryer cycles per year would be more appropriate, as it is based 
on more recent and nationally representative data. AHAM commented that 
a reduction in number of annual clothes

[[Page 56629]]

dryer cycles would be consistent with the trend for the average number 
of annual clothes washer cycles, which based on RECS 2015 data, AHAM 
asserted is 241. AHAM suggested that DOE update the number of annual 
clothes dryer cycles based on more recent national data. (AHAM, No. 33 
at pp. 4-5)
    To develop the estimate of 283 clothes dryer cycles per year 
previously specified in the test procedure, DOE utilized the 2005 RECS 
data to estimate the average number of clothes dryer cycles per year 
based on clothes washer cycle data and a clothes dryer usage factor 
(the percentage of washer loads dried in a clothes dryer).\33\ The 2015 
RECS data, which included cycle data specific to clothes dryers, was 
first released in April 2017, and then subsequently updated multiple 
times with the most recent update, Version 4, released in December 
2018.\34\ DOE calculated the average number of clothes dryer cycles per 
year, using the reported number of laundry loads (clothes dryer cycles) 
dried per week for each sample home in the 2015 RECS data set with a 
clothes dryer, which is the same methodology DOE used to develop the 
estimates of 283 clothes dryer cycles per year based on the 2005 RECS 
data set. Using this methodology, DOE calculated 236 cycles per year 
from the 2015 RECS data. Because this estimate is based on more recent 
consumer usage data than the previous estimate of 283 cycles pear year, 
DOE concludes that the estimate of 236 cycles per year is a more 
representative estimate of the average number of annual clothes dryer 
cycles at this time. DOE notes that its estimate of 236 clothes dryer 
cycles per year is very close to the estimate of 238 cycles per year 
presented by AHAM.
---------------------------------------------------------------------------

    \33\ The 2005 RECS provided data regarding how often a clothes 
dryer was used following a clothes washer cycle, with answers of 
``every time you wash clothes'', ``use it for some, but not all 
loads of wash'', ``use it infrequently''. Using that information and 
clothes washer usage data, the estimate of 283 annual clothes dryer 
cycles was developed.
    \34\ The most recent RECS microdata can be accessed at 
www.eia.gov/consumption/residential/data/2015/index.php?view=microdata.
---------------------------------------------------------------------------

    DOE is updating the estimate of the representative average annual 
number of clothes dryer cycles per year in section 4.5 of appendix D2. 
This update maintains the methodology used to establish the average 
number of clothes dryer cycles per year and updates the resulting 
average based on an update to the underlying data source (i.e., RECS), 
as recommended by commenters. The updated estimate will impact the 
measured energy efficiency of clothes dryers by reducing the portion of 
annual hours in active mode, thereby increasing the per-cycle standby 
mode and off mode energy consumption as determined in section 4.5 of 
appendix D2. Also, DOE notes that the current energy conservation 
standards were developed based on the 283 cycles per year estimate. As 
such, the updated clothes dryer annual cycles per year estimate will be 
required beginning on the compliance date of amended energy 
conservation standards for clothes dryers, should standards be amended. 
Prior to any such amendment to the energy conservation standards, the 
DOE test procedure will continue to use the estimate of 283 clothes 
dryer cycles per year in the per-cycle standby mode and off mode energy 
consumption calculation.
2. Inactive and Off Mode Power Measurements
    Section 3.6 of appendix D1 and appendix D2 \35\ provides the 
instructions for measuring standby (``inactive'') mode 36 37 
and off mode \38\ power on the clothes dryer. The per-cycle combined 
total energy consumption of a clothes dryer includes the combined 
representative measures of inactive mode and off mode power in sections 
4.5 and 4.6, respectively, of appendix D1 and appendix D2. The test 
procedure distinguishes between inactive mode and off mode. However, 
when only one of the low-power modes is present, regardless of whether 
the low-power mode is considered inactive mode or off mode, the same 
measurement and calculation is performed.\39\
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    \35\ In this final rule, section 3.6 of appendix D2 is being 
renumbered as section 3.5, as a result of removing obsolete 
provisions from the test procedures. See section III.E.5 of this 
final rule for additional details.
    \36\ Section 1.17 of appendix D1 and section 1.18 of appendix D2 
define ``standby mode'' as any mode in which the product is 
connected to a mains power source and offers one or more of the 
following user-oriented or protective functions that may persist for 
an indefinite period of time: (1) A function that facilitates the 
activation of other modes (including activation or deactivation of 
active mode) by remote switch (including remote control), internal 
sensor, or timer; or (2) continuous functions, including information 
or status displays (including clocks) or sensor-based functions. The 
definition also specifies that a timer is a continuous clock 
function (which may or may not be associated with a display) that 
provides regular, scheduled tasks (e.g., switching) and that 
operates on a continuous basis.
    \37\ Section 1.12 of appendix D1 and section 1.13 of appendix D2 
define ``inactive mode'' as a standby mode that facilitates the 
activation of active mode by remote switch (including remote 
control), internal sensor, or timer, or that provides continuous 
status display.
    \38\ Section 1.15 of appendix D1 and section 1.16 of appendix D2 
define ``off mode'' as a mode in which the clothes dryer is 
connected to a mains power source and is not providing any active 
mode or standby function, and where the mode may persist for an 
indefinite period of time. The definition further states that an 
indicator that only shows the user that the product is in the off 
position is included within the classification of an off mode.
    \39\ Distinguishing inactive mode from off mode is not an issue 
when both are present. When both modes are present, inactive mode 
and off mode can be distinguished from each other based on the 
measured energy use; i.e., inactive mode will result in a higher 
measured energy use than off mode.
---------------------------------------------------------------------------

    The prior test procedure for measuring inactive and/or off mode 
power is as follows. Section 3.6.1 of appendix D1 and appendix D2 
instructs inactive mode to be measured, if the clothes dryer has an 
inactive mode, with the resulting measurement represented by the symbol 
PIA. Similarly, section 3.6.2 of both appendices instructs 
off mode power to be measured, if the clothes dryer has an off mode, 
with the resulting distinct power measurement represented by symbol 
POFF. In section 4.5 of both appendices, if a clothes dryer 
has either inactive mode or off mode (but not both), the measured power 
is multiplied by 8,620, representing the combined annual hours that the 
clothes dryer is not in active mode (i.e., idle). Alternately, if a 
clothes dryer has both inactive mode and off mode (e.g., an electronic 
control panel that also provides a hard off switch that can completely 
disconnect all power to the product), the power of each mode is 
measured and multiplied by one-half of 8,620 (i.e., 4,310), and the 
results are summed.\40\ As these sections were structured, a 
determination first had to be made whether the low-power mode(s) that 
exists on the clothes dryer meets the definition of inactive mode or 
off mode--even though the same calculation applies, yielding the same 
end result, regardless of the distinction.
---------------------------------------------------------------------------

    \40\ This calculation represents an estimate that such a clothes 
dryer would spend half of its low-power mode hours in inactive mode, 
and the other half of its low-power mode hours in off mode.
---------------------------------------------------------------------------

    As discussed in the July 2019 NOPR, the ``off'' state on some 
appliances is achieved through a software/firmware action (i.e., 
through a ``soft switch'') rather than a hard on/off switch (i.e., a 
switch that physically breaks the connection to the mains power 
supply), and it may not always be clear whether the product is 
providing any active mode or standby function while in the ``off'' 
state. 84 FR 35484, 35495. To address questions regarding the potential 
difficulty in determining whether the low-power mode is considered 
inactive mode or off mode without needing to remove a product's console 
to access the electrical schematic and/or determine if the switch is a 
``hard'' switch or ``soft''

[[Page 56630]]

electronic switch, DOE proposed the following changes to appendix D1 
and appendix D2 in the July 2019 NOPR:
     Replace the symbols PIA and POFF, 
for measuring inactive mode \41\ and off mode, respectively, with 
Pdefault and Plowest, including revisions to the 
calculation symbols in section 3.6.1 of appendix D1 and 3.5.1 of 
appendix D2. Pdefault represents the low-power measurement 
if only one power level is observed. If two power levels are observed, 
Plowest represents the off mode power measurement and 
Pdefault represents the inactive mode power measurement.
---------------------------------------------------------------------------

    \41\ Inactive mode is the only type of standby mode required to 
be measured in appendix D1 and appendix D2.
---------------------------------------------------------------------------

     For clothes dryers with both an inactive mode and off mode 
(i.e., clothes dryers with electronic controls that offer an optional 
switch (or other means) that can be selected by the end user to achieve 
a lower power state than the default inactive/off mode state),\42\ 
section 3.6.2 of appendix D1 and 3.5.2 of appendix D2 require that, 
after performing the measurement in section 3.6.1 of appendix D1 or 
3.5.1 of appendix D2, the switch (or other means) be activated to the 
position resulting in the lowest power consumption and the measurement 
procedure described in section 3.6.1 and 3.5.1, respectively, be 
repeated. Measure and record the average power consumption as the 
lowest standby/off mode power, Plowest, in watts.
     Revise section 3.6 of appendix D1 and newly renumbered 
section 3.5 of appendix D2 to state that for a clothes dryer that takes 
time to automatically enter a stable inactive/off mode state from a 
higher power state, as discussed in Section 5, Paragraph 5.1, note 1 of 
IEC Standard 62301, allow sufficient time for the clothes dryer to 
automatically reach the default inactive/off mode state before 
proceeding with the test measurement. Replace the term ``lower power 
state'' with ``default standby/off mode state,'' recognizing that the 
lower power state that the clothes dryer reaches by default may be 
either a standby (inactive) mode or an off mode.
     Perform standby mode and off mode testing after completion 
of an active mode drying cycle; after removing the test load; without 
changing the control panel settings used for the active mode drying 
cycle; with the door closed; and without disconnecting the electrical 
energy supply to the clothes dryer. DOE noted that the order of 
sections within the clothes dryer test procedures suggests that the 
standby mode and off mode measurement (section 3.6 of appendix D1 and 
section 3.5 of appendix D2) is performed after the active mode test 
cycle (sections 3.3 through 3.5 of appendix D1 and sections 3.3 and 3.4 
of appendix D2); therefore, the proposed approach likely reflects 
current practice within the industry. 84 FR 35484, 35495-35496 (July 
23, 2019).
    AHAM supported the proposal to amend the clothes dryer test 
procedures to use nomenclature, symbols, and structure, procedural 
instructions, and assigned annual hours based on observable and 
measurable characteristics of the clothes dryer, rather than based on 
knowledge of the control panel switch type or internal functionality of 
the clothes dryers. AHAM supported DOE's proposed modification to the 
sequence of testing for standby or off mode power measurement to 
perform the standby mode and off mode testing after the active mode 
testing, which reflects current practice by test laboratories. (AHAM, 
No. 33 at p. 9)
    In this final rule, DOE is amending the test procedure in 
accordance with the proposals outlined above, adding new symbols to 
represent the ``default'' and ``lowest'' standby power measurements, 
along with instructions for their applications based on observable 
characteristics of the clothes dryer. DOE is also amending appendix D1 
and appendix D2 to specify that inactive and off mode tests must be 
performed after completion of an active mode drying cycle, and the unit 
must be allowed sufficient time to automatically reach its default 
inactive/off mode power state before performing measurements. Under the 
revised section 3.6 of appendix D1 and newly renumbered section 3.5 of 
appendix D2, DOE is requiring that the same sequence of measurements be 
performed as in the previous section 3.6 in both appendix D1 and 
appendix D2, to yield the same power measurement(s) for clothes dryers 
with inactive mode, off mode, or both. Further, DOE is specifying that 
the same annual hours that were previously specified shall be applied 
to the average power measurement(s) in section 4.5 of both appendix D1 
and appendix D2. DOE has determined that these amendments to appendix 
D1 and appendix D2 will not impact the measured efficiency of clothes 
dryers, because the amendments are amendments to nomenclature and 
provide additional direction.
3. General Test Procedure Provisions at 10 CFR 430.23(d)
    The general test procedure provisions for clothes dryers in 10 CFR 
430.23(d) include methods for calculating the estimated annual 
operating cost, CEF, and other useful measures of energy consumption 
using appendix D1. In the July 2019 NOPR, DOE proposed to amend the 
test procedure to provide explicitly for calculating each of these 
metrics using appendix D2 as well as to include methods of calculating 
the estimated annual energy use.
    AHAM and the Joint Commenters supported DOE's proposal to extend 
calculations of energy consumption to appendix D2 and to add a new 
calculation of annual energy use, stating that this would ensure 
consistency in the test procedure. (AHAM, No. 33 at p. 9; Joint 
Commenters, No. 34 at p. 3)
    DOE is adopting the test procedure amendments as proposed in the 
July 2019 NOPR to provide explicitly for the calculation of useful 
measures of energy consumption, including estimated annual energy use, 
using appendix D2.
4. Rounding Requirements for Reported Values
    In the July 2019 NOPR, DOE proposed adding a new section at 10 CFR 
429.21(c) to specify the rounding requirements of all numeric reported 
values for clothes dryers, including CEF, capacity, voltage, and hourly 
Btu rating. Similarly, DOE proposed adding the same rounding 
requirement for the capacity measurement in section 3.1 of both 
appendix D1 and appendix D2, which would add specificity to the 
measurement of drum capacity as it relates to determining whether a 
compact-size load (for a drum capacity less than 4.4 cubic feet) or 
standard-size load must be used for testing. The proposed rounding 
requirements for CEF, capacity, voltage, and Btu rating would maintain 
consistency with the level of precision currently provided in DOE's 
Compliance Certification Management System (``CCMS'').
    DOE also proposed to specify further the rounding instructions 
provided at 10 CFR 430.23(d)(1) (renumbered to paragraph (d)(2) as 
amended in this document) pertaining to estimated annual operating 
cost. Previously, the rounding instructions for an electric clothes 
dryer were provided in paragraph (d)(1)(i)(C). DOE proposed moving the 
rounding instructions to paragraph (d)(1)(i) to clarify that the 
rounding provision applies to the product of all three factors 
multiplied in paragraphs (d)(1)(i)(A), (B), and (C). Similarly, for gas 
clothes dryers, DOE

[[Page 56631]]

proposed to move the rounding instructions from its previous location 
embedded within paragraph (d)(1)(ii)(B) to the higher-level paragraph 
at paragraph (d)(1)(ii).
    AHAM and GEA supported DOE's proposal to specify the rounding 
requirements of all numeric reported values for clothes dryers. 
Additionally, AHAM and GEA requested that DOE clarify the rounding 
requirements for scale weight measurements. AHAM recommended the 
rounding of scale weight values to the nearest whole number digit, 
asserting the absence of such a specification in conjunction with the 
required minimum scale resolution may result in an unacceptable range 
of variation.\43\ These commenters stated that rounding to the nearest 
whole number for FMC is acceptable based on the current state of the 
clothes dryer test procedure, the measurement error, and laboratory 
capabilities. (AHAM, No. 33 at pp. 9-10, 12; GEA, No. 37 at p. 2)
---------------------------------------------------------------------------

    \43\ Section 2.4.1 of appendices D1 and D2 specify that the 
weighing scale for test cloth shall have a range of 0 to a maximum 
of 60 pounds with a resolution of at least 0.2 ounces, and a maximum 
error no greater than 0.3 percent of any measured value within the 
range of 3 to 15 pounds. AHAM suggested that applying this allowable 
error to the weight of the bone-dry test cloth and test cloth after 
the test cycle, with a measured FMC of 2 percent, could in fact be 
as high as 2.4 percent or as low as 1.6 percent. AHAM suggested that 
rounding FMC would eliminate the need to resolve issues with scale 
resolution that result in potentially misreporting FMC.
---------------------------------------------------------------------------

    GEA asserted that rounding to the nearest whole number for moisture 
content resolves the instrumentation resolution issue and is in keeping 
with ASTM's best practice guidance. (GEA, No. 37 at p. 2) AHAM reported 
that its members have noted that there is inherent measurement 
variation (compounded tolerance) that can cause a theoretical FMC of 2 
percent to be reported as high as 3 percent.\44\ AHAM recommended a 
resolution for scales of at least 0.005 pounds with a maximum error of 
no greater than 0.1 percent of any measured value. AHAM also 
recommended specifying the same scale be used for bone-dry weight, IMC, 
and FMC measurements. AHAM suggested that this change would not add 
cost to the test as it expects laboratories already have 
instrumentation capable of this resolution. (AHAM, No. 33 at pp. 9-10, 
12) As discussed in section III.C.4 of this document, GEA supported all 
requests for tighter tolerances in the AHAM comments. GEA agreed that 
the current test procedure allows for tolerance stacking issues that 
introduce variability in the DOE verification process and reported that 
the suggested tolerances would not increase test burden or cost. (GEA, 
No. 37 at p. 2)
---------------------------------------------------------------------------

    \44\ AHAM applied the maximum allowable measurement error of 
0.3 percent to the bone-dry test cloth weight and final 
test cloth weight measurements. AHAM stated that a final FMC value 
of 2 percent could yield a measurement between 1.4 percent and 2.6 
percent, given the allowable measurement error of 0.3 
percent.
---------------------------------------------------------------------------

    DOE proposed rounding requirements in the July 2019 NOPR, which 
implicate the weighing scale resolution,\45\ as noted by the comments 
received, in ensuring repeatable and reproducible test results. DOE 
acknowledges that, in the absence of revised scale resolution 
requirements, hypothetically a variation as described by AHAM could 
occur. However, under current testing practice this is not occurring. 
Based on interactions with testing laboratories, DOE is aware that, in 
general, test laboratories are currently measuring test load weight 
using instrumentation with a scale resolution of 0.001 pounds and a 
maximum error of no greater than 0.1 (the value suggested by AHAM) 
percent of any measured value. This level of precision addresses the 
issue of compounded tolerance by effectively bounding a 2-percent FMC 
measurement between a range of 1.8-2.2 percent rather than 1.4-2.6 
percent. Accordingly, instead of addressing AHAM and GEA's concern 
through further rounding amendments, DOE is addressing the issue by 
codifying the current practice to ensure that the issue as described by 
commenters does not occur in the future. Also, rounding to the nearest 
whole number for FMC as suggested by these commenters would reduce the 
stringency of the requirement, given that an FMC of 2.4 percent could 
be rounded down to 2 percent, effectively raising the FMC requirement 
to be less than 2.5 percent as opposed to the prior requirement of 2 
percent. For these reasons, DOE is not amending FMC rounding 
requirements at this time. Instead, DOE is amending the scale tolerance 
and maximum error requirements to align with the current capabilities 
of test laboratories, thereby codifying this level of precision and 
addressing the issues of compounding tolerance raised by commenters. 
Specifically, DOE is amending the scale resolution requirements to be 
0.001 pounds with a maximum error of no greater than 0.1 percent of any 
measured value in section 2.4.1 of both appendix D1 and appendix D2.
---------------------------------------------------------------------------

    \45\ Rounding requirements relate to the number of significant 
digits of the measured value, which are dictated by the resolution 
of the weighing scale.
---------------------------------------------------------------------------

    DOE received no comments pertaining to the other specific rounding 
requirements proposed in the July 2019 NOPR. DOE is adopting all 
proposed rounding requirement changes from the July 2019 NOPR in the 
newly added 10 CFR 429.21(c).
5. Optional Usage of Appendix D1 or Appendix D2
    As discussed, manufacturers must use either appendix D1 or appendix 
D2 to demonstrate compliance with the applicable energy conservation 
standards, and must use a single appendix for all representations, 
including certifications of compliance.\46\ The current efficiency 
standards are based on appendix D1. Appendix D1 tests timed drying 
cycles, and accounts for clothes dryers with automatic termination 
controls by applying a higher field use factor to units that have this 
feature. Appendix D2 tests ``normal'' automatic termination cycles.
---------------------------------------------------------------------------

    \46\ ENERGY STAR certification requires testing using appendix 
D2. The ENERGY STAR clothes dryer specification can be found at 
www.energystar.gov/products/appliances/clothes_dryers/partners.
---------------------------------------------------------------------------

    NEEA, the California IOUs, NRDC, CEE, Energy Solutions, and Samsung 
recommended that DOE require testing under appendix D2 only, and delete 
appendix D1. NEEA commented that ENERGY STAR has now labeled 286 
clothes dryer models from 18 different manufacturers with appendix D2 
test procedure data, with an Environmental Protection Agency (``EPA'') 
estimated ENERGY STAR model market penetration of 35 percent. NEEA 
further commented that DOE reports that 269 unique models (43.5 
percent) in its CCMS database were tested according to appendix D2 and 
350 unique models (56.5 percent) were tested under appendix D1. The 
California IOUs, NEEA, and Samsung asserted that manufacturers have had 
sufficient time to adapt to appendix D2. These commenters suggested 
that the intention of having both appendix D1 and appendix D2 available 
for manufacturers was to ease the transition to the more representative 
automatic cycle termination test of appendix D2, and now that the 
appendix D2 test procedure has been adopted by ENERGY STAR and is 
commonly used, there no longer appears a need to test a model to 
appendix D1. (NRDC, No. 35 at pp. 1-2; CEE, No. 27 at pp. 1-3; 
California IOUs, No. 29 at pp. 16-19; Energy Solutions, Public Meeting 
Transcript, No. 23 at p. 56; Samsung, No. 36 at p. 2; NEEA, No. 38 at 
pp. 3-9, 18)
    The California IOUs, CEE, NRDC, and NEEA further asserted that 
appendix D1 artificially inflates the efficiency performance of units 
with poorly functioning automatic cycle termination features, since it 
applies a uniform field

[[Page 56632]]

use factor to all units with such a feature, impacting efficiency rank 
order. However, the California IOUs also suggested that as clothes 
dryers deploy improved automatic termination controls and clothes dryer 
operations, results from appendix D1 may not always be higher than 
those from appendix D2, an assertion that the California IOUs stated is 
supported by the 2019 PG&E testing. One unit from the PG&E test sample 
of four models had a higher CEF value using appendix D2 as compared to 
appendix D1. NEEA also cited the PG&E data, and both NEEA and the 
California IOUs commented that recent DOE-funded clothes dryer testing 
at Oak Ridge National Laboratory (``ORNL'') and PNNL similarly 
confirmed that the same clothes dryer models tend to achieve a higher 
efficiency value when tested to the appendix D1 test procedure than 
when tested to the appendix D2 test procedure, though the observed 
differences were not consistent across all models. Based on those 
reports,\47\ NEEA stated that: (1) CEF values dropped roughly 18 
percent when tested according to appendix D2, and the efficiency rank 
order among the tested models changed as well; (2) on average, the 
appendix D1 loads had five times the FMC than the appendix D2 loads at 
termination, but all FMCs were within acceptable limits for both test 
procedures, which implies that the energy use measured under appendix 
D1 will be less than the energy use measured under appendix D2 for the 
same clothes dryer, as clothes dryers remove more moisture under 
appendix D2; and (3) drying times increased by roughly 80 percent when 
tested according to appendix D2. (NRDC, No. 35 at pp. 1-2; CEE, No. 27 
at pp. 1-3; California IOUs, No. 29 at pp. 16-19; NEEA, No. 38 at pp. 
3-9, 18)
---------------------------------------------------------------------------

    \47\ Residential Clothes Dryer Performance Under Timed and 
Automatic Cycle Termination Test Procedures, Kyle Gluesencamp, ORNL, 
October 2014; Clothes Dryer Automatic Termination Sensor Evaluation: 
Volume 1: Characterization of Energy Use in Residential Clothes 
Dryers, W. TeGrotenhus, Ph.D., PNNL, September 2014.
---------------------------------------------------------------------------

    NEEA, the California IOUs, CEE, and NRDC stated that testing all 
models to the same procedure would facilitate comparison of performance 
between them, increasing the utility of the CCMS database and ENERGY 
STAR certification. NRDC and NEEA also suggested that using a single, 
uniform test procedure would allow for efficiency labeling of clothes 
dryers under the Federal Trade Commission (``FTC'') EnergyGuide 
labelling program. (NRDC, No. 35 at pp. 1-2; CEE, No. 27 at pp. 1-3; 
California IOUs, No. 29 at pp. 16-19; NEEA, No. 38 at pp. 3-9, 18)
    NRDC and the California IOUs suggested that because the current 
standards are based on appendix D1, it might be more appropriate to 
implement the retirement of appendix D1 during the next standards 
rulemaking, and they urged DOE to do so if it is not possible in this 
final rule. (NRDC, No. 35 at pp. 1-2; California IOUs, No. 29 at pp. 
16-19)
    AHAM opposed the removal of appendix D1 and mandatory use of 
appendix D2. AHAM did not support the existence of different test 
procedures to demonstrate compliance with the standard, but recognized 
that manufacturers must currently use a different test procedure to 
demonstrate ENERGY STAR eligibility for clothes dryers than compliance 
with energy conservation standards. AHAM stated that because 
manufacturers have already invested in developing products under this 
circumstance, it would not be equitable to change the status quo at 
this time. Accordingly, AHAM urged DOE to maintain both appendices, 
with appendix D2 being optional as an alternative to appendix D1. 
(AHAM, No. 33 at p. 11)
    A majority of the clothes dryers on the market continue to test 
under appendix D1. DOE notes that 746 clothes dryer models (62.6 
percent) listed in the CCMS database are certified to appendix D1, as 
compared to 445 models (37.4 percent) to appendix D2. DOE recognizes 
that under appendix D2, measured CEF values may be lower than CEF 
values measured under appendix D1. As discussed, appendix D2 includes 
methods for more accurately measuring the effects of automatic cycle 
termination and represents a significantly different testing 
methodology that may impact the energy consumption of some clothes 
dryers more than others. The current energy conservation standards are 
based on the test procedure in appendix D1, and to the extent that 
measured CEF under appendix D2 is lower than the measured CEF under 
appendix D1, this difference does not result in products being able to 
demonstrate compliance with a lower efficiency. For these reasons, DOE 
is maintaining the appendix D1 and appendix D2 test procedures and is 
continuing to allow certification in accordance with either test 
procedure.
6. Cycle Time Reporting
    Manufacturers are not currently required to report cycle time as 
part of the certification process. In response to the July 2019 NOPR, 
DOE received comments regarding the reporting of cycle times to inform 
consumer purchasing decisions.
    AHAM stated that the purpose of the energy conservation standards 
program is to regulate the efficiency of the product, not to inform 
consumers about all of the different factors that could affect their 
purchase. AHAM asserted that, while DOE should consider the impact of 
energy conservation standards on performance factors such as drying 
time, it is not appropriate for DOE to collect data on and create 
requirements for performance factors. AHAM questioned whether 
collecting data on drying time was permissible under EPCA. (AHAM, 
Public Meeting Transcript, No. 23 at pp. 83-84)
    NEEA suggested that DOE should require manufacturers to report 
drying time when testing using appendix D2, because certain efficient 
clothes dryers might achieve higher efficiency by taking a very long 
time to dry clothes. (NEEA, Public Meeting Transcript, No. 23 at pp. 
79-80) NEEA and PG&E encouraged DOE to require reporting of cycle 
times, suggesting that cycle time is a performance feature that 
consumers value. (NEEA, No. 38 at pp. 3, 12-16, 18; PG&E, Public 
Meeting Transcript, No. 23 at pp. 80-81)
    As stated, EPCA requires that the test procedures prescribed or 
amended by DOE be reasonably designed to produce test results which 
measure energy efficiency, energy use, or estimated annual operating 
cost of a covered product during a representative average use cycle or 
period of use, and not be unduly burdensome to conduct. (42 U.S.C. 
6293(b)(3)) DOE may require each manufacturer of a covered product to 
submit information or reports with respect to energy efficiency or 
energy use of such covered products to ensure compliance with the 
requirements of EPCA. (42 U.S.C. 6296(d)) DOE recognizes that cycle 
time is a relevant consideration under the current product class 
structure.
    On December 16, 2020, DOE published a final rule (``December 2020 
Final Rule'') establishing a separate product class for consumer 
clothes dryers that offer cycle times for a normal cycle of less than 
30 minutes. 85 FR 81359.\48\ On January 19, 2021, the States of 
California, Connecticut, Illinois, Maine, Michigan, Minnesota, New 
Jersey, New Mexico, New York, Nevada, Oregon, Vermont, and Washington, 
the Commonwealth of Massachusetts, the District of Columbia, and the 
City of

[[Page 56633]]

New York filed a petition for review of the December 2020 Final Rule in 
the Second Circuit. Shortly thereafter, two other groups of petitioners 
filed petitions for review of the December 2020 Final Rule. The 
Alliance for Water Efficiency, the U.S. Public Interest Research Group, 
and Environment America filed a petition for review of that final rule 
in the Seventh Circuit on January 17, 2021, and the Sierra Club filed a 
petition for review of that final rule in the Ninth Circuit on February 
12, 2021. After transfer of the Seventh and Ninth Circuit petitions for 
review, all three cases were consolidated in the Second Circuit. 
Briefing on the merits is currently stayed through October 1, 2021, 
while DOE reviews the December 2020 Final Rule. Additionally, on April 
2, 2021, AHAM petitioned DOE to reconsider the December 2020 Final Rule 
that established and amended standards for short-cycle residential 
clothes washers and dryers.\49\ In its petition AHAM requested that DOE 
withdraw the December 2020 Final Rule. (Id. at p. 19)
---------------------------------------------------------------------------

    \48\ The December 2020 Final Rule also established short-cycle 
product classes for residential clothes washers.
    \49\ EERE-2020-BT-STD-0001-0048, at www.regulations.gov.
---------------------------------------------------------------------------

    DOE is re-evaluating the analysis in the short-cycle product class 
determination pursuant to Executive Order 13990, Protecting Public 
Health and the Environment and Restoring Science to Tackle the Climate 
Crisis. In light of the on-going review, DOE is not adopting reporting 
requirements for cycle time in this final rule.

E. Formatting Changes and Typographical Errors

    To improve the readability of the text in certain sections of 
appendix D1 and appendix D2, DOE is making minor typographical 
corrections and formatting modifications as discussed in the following 
paragraphs. These minor modifications do not change the substance of 
the test methods and do not impact the measured energy use.
1. ``Conventional'' and ``Vented'' Nomenclature
    Previously, appendix D1 and appendix D2 defined the term 
``conventional clothes dryer'' as a clothes dryer that exhausts the 
evaporated moisture from the cabinet. Appendix D1, section 1.7; 
appendix D2, section 1.8. This definition is synonymous with a ``vented 
clothes dryer.'' Conversely, ``ventless clothes dryer'' is defined as a 
clothes dryer that uses a closed-loop system with an internal condenser 
to remove the evaporated moisture from the heated air. Appendix D1, 
section 1.19; appendix D2, section 1.21. The moist air is not 
discharged from the cabinet. Id.
    The product classes in DOE clothes dryer energy conservation 
standards use the terms ``vented'' and ``ventless'' to refer to the 
different methods used by the clothes dryer to remove moisture from the 
cabinet. 10 CFR 430.32(h)(3). To provide consistency between these 
product classes and the terminology used in the clothes dryer test 
procedures, DOE is replacing the word ``conventional'' with ``vented'' 
throughout both appendix D1 and appendix D2. This change affects the 
nomenclature only and does not affect the classification of clothes 
dryers or conduct of the test procedure for any clothes dryers.
2. Symbol Definitions
    Previously, appendix D1 and appendix D2 included inconsistent use 
of symbol definitions for the measured bone-dry weight and moisture 
content values. DOE is adding the symbol definition for bone-dry weight 
(Wbonedry) to section 3.4.1 of both appendices, where it is 
first referenced. DOE is changing the symbol definitions for moisture 
content of the wet test load (previously Ww) and moisture 
content of the dry test load (previously Wd) to IMC and FMC, 
respectively, to better differentiate these percentage values from 
Wbonedry, which is a weight value. See section 4.1 of both 
appendix D1 and appendix D2. Similarly, DOE is also adding the symbol 
definitions IMC and FMC to section 3.4.2 and section 3.4.3, 
respectively, where these values are first referenced in both appendix 
D1 and appendix D2. DOE is also updating the symbols used throughout 
section 4 of both appendices in each calculation in which these terms 
are used. The additions and revisions of these symbol definitions will 
more readily provide an understanding of the measured values associated 
with each of these symbols, as well as improve the readability of 
subsequent sections of the test procedures where these symbols are 
referenced.
3. Removal of Duplicate Instructions for Test Load Preparation
    Section 2.7.1 and section 2.7.2 of both appendix D1 and appendix D2 
provide instructions for preparing a compact-size clothes dryer load 
and a standard-size clothes dryer load, respectively. Each section 
previously specified the required load weight and then provided the 
same instructions for preparing a damp test load before loading. DOE is 
restructuring section 2.7.1 and section 2.7.2 in each appendix to 
remove this duplication. For both appendices, the revised section 2.7.1 
includes a table specifying the required test loads for standard-size 
and compact-size clothes dryers, in addition to the requirement that 
each test load must consist of energy test cloths and no more than five 
energy stuffer cloths. For both appendices, the revised section 2.7.2 
provides the procedure for dampening the test load. These amendments do 
not change the conduct of the test procedure for either appendix D1 or 
appendix D2 but improve readability of the test procedures.
4. Typographical Errors
    In this final rule, DOE is correcting the following typographical 
errors in appendix D1 and appendix D2:
    Section 1.5 and section 2.6 of appendix D1 and section 1.6, section 
2.7.1, and section 2.7.2 of appendix D2 used the term ``test clothes,'' 
where ``test cloths'' should have been used instead. Section 1.16 of 
appendix D2 misspelled the term ``classification'' in the definition of 
``off mode.''
    Section 2.4.1 of both appendix D1 and appendix D2 contained section 
numbering errors. Previously, section 2.4.1 was titled Weighing scale 
for test cloth and included specifications for the scale used to weigh 
the test loads, and the section that followed was incorrectly numbered 
as section 2.4.1.2 Weighing scale for drum capacity measurements. DOE 
is correcting this in both appendix D1 and appendix D2 by inserting a 
new title, section 2.4.1 Weighing scales, and renumbering existing 
section 2.4.1 Weighing scale for test cloth as section 2.4.1.1.
    The calculation of the total per-cycle electric clothes dryer 
energy consumption in section 4.1 of appendix D1 referenced an 
undefined symbol ``Ett'', which should instead have been 
``Et'', the total energy consumed during the test cycle as 
recorded in section 3.4.5 of appendix D1. The word ``for'' was also 
missing from the wording of the description of the 1.04 field use 
factor in section 4.1 of appendix D1.
    In addition, section 4.3 of both appendix D1 and appendix D2 
referenced the symbol ``Ege'', which should instead have 
been ``Egg'', the calculated gas clothes dryer gas energy 
consumption per cycle.
5. Removal of Obsolete Provisions
    Section 1.14 of appendix D1 and section 1.15 of appendix D2 
provided a definition for ``moisture sensing control;'' \50\ similarly, 
section 1.18 of

[[Page 56634]]

appendix D1 and section 1.19 of appendix D2 provided a definition for 
``temperature sensing control.'' \51\ Both of these definitions were 
obsolete, having been incorporated into a broader term ``automatic 
termination control'' \52\ in section 1.4 of both appendices as part of 
the January 2011 Final Rule. 76 FR 972, 978 (Jan. 6, 2011). In 
addition, the terms ``moisture sensing control'' and ``temperature 
sensing control'' were not referenced anywhere else within appendix D1 
or appendix D2. DOE is removing these definitions from both appendices 
and renumbering the subsequent sections of the test procedure 
accordingly.
---------------------------------------------------------------------------

    \50\ ``Moisture sensing control'' is defined as a system which 
utilizes a moisture sensing element within the dryer drum that 
monitors the amount of moisture in the clothes and automatically 
terminates the dryer cycle.
    \51\ ``Temperature sensing control'' is defined as a system 
which monitors dryer exhaust air temperature and automatically 
terminates the dryer cycle.
    \52\ ``Automatic termination control'' is defined as a dryer 
control system with a sensor which monitors either the dryer load 
temperature or its moisture content and with a controller which 
automatically terminates the drying process. A mark, detent, or 
other visual indicator or detent which indicates a preferred 
automatic termination control setting must be present if the dryer 
is to be classified as having an ``automatic termination control.'' 
A mark is a visible single control setting on one or more dryer 
controls.
---------------------------------------------------------------------------

    Section 3.5 of appendix D2 described the application of a field use 
factor for clothes dryers with automatic termination controls. In the 
August 2013 Final Rule, DOE eliminated the field use factor in appendix 
D2 for automatic termination control clothes dryers, in conjunction 
with new procedures that directly measure any over-drying energy 
consumption of automatic termination control clothes dryers. 78 FR 
49608, 49611 (Aug. 14, 2013). In the August 2013 Final Rule, DOE 
erroneously retained the obsolete section 3.5 of appendix D2. DOE 
therefore is removing section 3.5 of appendix D2 and adjusting the 
numbering of subsequent sections accordingly.
    Section 4.7 of both appendix D1 and appendix D2 provided the 
equation for calculating EF. DOE's energy conservation standards for 
clothes dryers were based on energy factor (``EF'') for clothes dryers 
manufactured on or after May 14, 1994 and before January 1, 2015. 
However, as of January 1, 2015, clothes dryer energy conservation 
standards are based on the CEF metric. Similarly, DOE's certification 
reporting requirements for clothes dryers at 10 CFR 429.21(b)(2) 
required reporting CEF when using appendix D1 or appendix D2; EF was 
required only when using appendix D, which is obsolete and is removed 
in this final rule. Furthermore, ENERGY STAR qualification is based on 
the CEF metric. DOE is not aware of any current regulatory programs or 
criteria that use the EF metric. Therefore, DOE is removing the 
obsolete calculation of EF in section 4.7 of both appendix D1 and 
appendix D2, renumbering the subsequent sections of the test procedures 
accordingly, and removing EF as a measure of energy consumption 
described at 10 CFR 430.23(d)(2).

F. Removing Obsolete Appendix D

    In the July 2019 NOPR, DOE proposed to remove appendix D from 10 
CFR part 430, since this version of the test procedure is no longer 
used. DOE also proposed to remove the references to appendix D from 10 
CFR 430.23(d), as well as in the clothes dryer certification reporting 
requirements in 10 CFR 429.21(b)(2).
    AHAM stated that it did not oppose DOE's proposal to remove 
appendix D, because this appendix is no longer mandatory. (AHAM, No. 33 
at p. 11) No other comments were received on the removal of appendix D.
    Given that appendix D is no longer in use, DOE is removing appendix 
D and all associated references throughout 10 CFR 429.21 and 10 CFR 
430.23(d).

G. Test Procedure Costs and Impact

    EPCA requires that test procedures adopted by DOE not be unduly 
burdensome to conduct. In this document, DOE amends the existing test 
procedure for residential clothes dryers. DOE has determined that the 
test procedure as amended by this final rule will not be unduly 
burdensome for manufacturers to conduct.
    In this final rule, DOE adopts a number of amendments to both 
appendix D1 and appendix D2. The current energy conservation standards 
for clothes dryers were developed based on results obtained using 
appendix D1. As discussed in the following sections, neither the 
amendments to appendix D1 or appendix D2 will impact the current costs 
of the test procedures.
    None of the amendments to appendix D1 or appendix D2 will impact 
the scope of the test procedure (i.e., the amendments will not require 
manufacturers to test clothes dryers that are not already required to 
be tested). Additionally, DOE has determined that none of the 
amendments will require manufacturers to re-test or re-certify any 
existing models on the market that have been tested and certified using 
appendix D1 or appendix D2.
    Based on the discussion that follows, DOE has determined that these 
amendments to the clothes dryer test procedure in appendix D1 and 
appendix D2 will not be unduly burdensome for manufacturers to conduct.
1. Maintaining Hourly Btu Rating for Gas Clothes Dryers
    DOE specifies the order of adjustment, from least burdensome to 
most burdensome, for the three types of adjustments that can be made to 
maintain the required heat input rate for natural gas and propane 
clothes dryers. As described, this amendment is generally consistent 
with industry practice. To the extent that any deviations from this 
order may occur in practice, the additional direction provided by these 
amendments will not require any manufacturers to retest or re-certify 
any basic models currently on the market because the net result of 
maintaining the hourly Btu rating within 5 percent of the 
rated value will not change. Therefore, drying performance will not be 
impacted in comparison to results obtained under the previous test 
procedures.
2. Final Moisture Content Requirement
    DOE explicitly specifies that any second test run using the highest 
dryness level setting must result in an FMC of 2 percent or less for 
the test to be considered valid. This amendment impacts only appendix 
D2, and therefore has no impact on testing under appendix D1. As 
described, this amendment reflects the current practice of 
manufacturers and test laboratories, and therefore does not impact the 
cost of testing.
3. Additional Amendments
    DOE has determined that the remainder of the amendments adopted in 
this final rule will not impact test costs.
    DOE provides direction regarding the required settings for network 
capabilities during testing under both appendix D1 and appendix D2. 
This direction will not impact test costs as it provides further 
direction to the prior test procedure and does not require conducting 
an additional test. The amendment will not change the measured energy 
use of basic models for which the consumer is required to turn on the 
network capability, as the prior test procedure provided no direction 
to do so. To the extent that there are basic models with the network 
capability enabled in the as shipped condition, the energy use 
attributable to the network function would have been captured under the 
prior test procedure. For any such basic models, the direction 
regarding the network capabilities adopted in this document will result 
in lower measured energy use as compared

[[Page 56635]]

to the prior test procedure. Therefore, the amendment regarding network 
capabilities adopted in this final rule will not result in a basic 
model that is complaint under the prior test procedure becoming non-
compliant.
    DOE provides additional direction on the dryness level setting for 
clothes dryers that provide an even number of discrete dryness 
settings. This amendment impacts only appendix D2, and therefore has no 
impact on testing under appendix D1. This amendment will not impact 
testing costs, as it provides direction for the required setting for 
the previously required test, without requiring any additional testing.
    DOE is updating the representative annual number of drying cycles 
in the per-cycle standby mode and off mode energy consumption 
calculations in appendix D2 to use the most recently available data. 
The updated number of drying cycles will not be required for use unless 
and until such time the energy conservation standards are amended 
taking into account the updated value. As such, this amendment will not 
require retesting or recertification.
    DOE provides revisions regarding the measurement and accounting of 
standby mode and off mode power in both appendix D1 and appendix D2. 
DOE has determined that these revisions potentially reduce testing 
costs for third-party laboratories, as the amendment does not require 
any disassembly of a clothes dryer to determine the appropriate 
application of the test procedure. However, DOE has not quantified the 
potential reduction in testing cost.
    DOE provides a variety of formatting and typographical corrections 
to both appendix D1 and appendix D2. These edits remove confusion that 
may result from the errors and improve the readability of the test 
procedures.
    DOE amends 10 CFR 430.23(d) to include instructions for calculating 
estimated annual operating cost, CEF, and other useful metrics using 
appendix D2. The prior test procedure provision provided for the 
calculation of these values using measurements from appendix D1. The 
test procedure as finalized in this document also explicitly provides 
for calculating these values using measurements from appendix D2. This 
amendment provides additional direction regarding the calculation of 
metrics and no additional testing will be required.
    DOE is revising the required weighing scale resolution for weighing 
test cloths to limit test variation consistent with current test 
laboratory capabilities. In DOE's experience, testing facilities are 
currently using instrumentation that meet these new instrumentation 
requirements, and therefore DOE concludes that these revisions will not 
impact test burden.
    Manufacturers will be able to rely on data generated under the 
previous test procedure, and no retesting or recertification will be 
required as a result of this test procedure.

H. Harmonization With Industry Standards

    The test procedures for clothes dryers in appendix D1 and appendix 
D2 incorporate by reference AHAM HLD-1-2009, ``Household Tumble Type 
Clothes Dryers,'' (which was later certified as ANSI/AHAM HLD-1-2010) 
and IEC Standard 62301. Specifically, both appendices reference an 
exhaust simulator specified in AHAM HLD-1-2009 in their test setup 
instructions, and incorporate IEC Standard 62301, which provides test 
conditions, testing equipment, and methods for measuring standby mode 
and off mode power consumption. Appendix D1 and appendix D2 also 
require the use of AHAM Standard Test Detergent Formula 3 for 
preconditioning the test cloths. DOE has determined that the revisions 
to the standby and off mode power provisions do not impact the existing 
references to industry standards and do not alter the applicability of 
those referenced industry standards to the DOE test procedure.
    The California IOUs suggested that DOE review comments they 
submitted in response to the NOPR published on February 13, 2019, 
proposing amendments to DOE's rulemaking process (84 FR 3910); 
specifically, their recommendation that DOE use industry-based test 
procedures as guidance documents and that all industry test procedures 
should be evaluated consistent with EPCA. (California IOUs, No. 29 at 
p. 21) AHAM supported the practice of adopting voluntary consensus-
based test procedures without modification, specifically the 
incorporation by reference of the latest version of AHAM HLD-1, though 
AHAM did not support incorporation by reference of IEC Standard 61121. 
AHAM commented that, while there may be times when it is appropriate to 
incorporate European standards by reference, in this case the European 
procedure does not produce results that are directly comparable to the 
DOE test procedure results. (AHAM, No. 33 at p. 13)
    In conducting this test procedure rulemaking, DOE reviewed relevant 
industry standards, including AHAM HLD-1 and IEC Standard 61121. The 
DOE test procedure continues to reference AHAM HLD-1. Because adoption 
of AHAM HLD-1 in its entirety would impact the measured energy use of 
clothes dryers for purposes of determining compliance with DOE 
standards, DOE did not amend appendix D1 or appendix D2 to adopt AHAM 
HLD-1 in its entirety in this rulemaking. Consistent with its 2020 
amendments to the Process Rule at 10 CFR part 430, subpart C, Appendix 
A, DOE will, however, consider adoption of AHAM HLD-1 in its entirety 
in a subsequent rulemaking prior to any rulemaking to consider whether 
to amend the energy conservation standards applicable to clothes 
dryers.
    As noted, the 2009 version of AHAM HLD-1 has been certified as 
ANSI/AHAM HLD-1-2010. ANSI certification ensures that the standard has 
been developed through a process that meets ANSI's requirements for 
openness, balance, consensus, and other due process safeguards.\53\ The 
certification of AHAM HLD-1 as ANSI/AHAM HLD-1-2010 does not result in 
any substantive changes to the industry standard. In this final rule, 
DOE is updating the reference to AHAM HLD-1 in appendix D1 and appendix 
D2 to the 2010 version of ANSI/AHAM HLD-1. This update to the most 
recent version of AHAM HLD-1 does not result in any changes to the 
clothes dryer test procedures at appendix D1 and appendix D2.
---------------------------------------------------------------------------

    \53\ More information on ANSI's standards process may be found 
at: www.ansi.org/standards_activities/overview/overview?menuid=3.
---------------------------------------------------------------------------

I. Effective and Compliance Dates

    The effective date for the adopted test procedure amendments will 
be 30 days after publication of this final rule in the Federal 
Register. EPCA prescribes that all representations of energy efficiency 
and energy use, including those made on marketing materials and product 
labels, must be made in accordance with an amended test procedure, 
beginning 180 days after publication of the final rule in the Federal 
Register. (42 U.S.C. 6293(c)(2)) EPCA allows individual manufacturers 
to petition DOE for an extension of the 180-day period if the 
manufacturer may experience undue hardship in meeting the deadline. (42 
U.S.C. 6293(c)(3)) To receive such an extension, petitions must be 
filed with DOE no later than 60 days before the end of the 180-day 
period and must detail how the manufacturer will experience undue 
hardship. Id. To the extent the modified test procedure adopted in this 
final rule is required

[[Page 56636]]

only for the evaluation and issuance of updated efficiency standards, 
compliance with the amended test procedure does not require use of such 
modified test procedure provisions until the implementation date of 
updated standards.
    In addition, DOE amends the introductory note in both appendix D1 
and appendix D2 to remove reference to the optional early use of the 
test procedures before the compliance date of the current clothes dryer 
energy conservation standards, which was January 1, 2015.

IV. Procedural Issues and Regulatory Review

A. Review Under Executive Order 12866

    The Office of Management and Budget (``OMB'') has determined that 
this test procedure rulemaking is not a ``significant regulatory 
action'' under section 3(f) of Executive Order (``E.O.'') 12866, 
Regulatory Planning and Review, 58 FR 51735 (Oct. 4, 1993). 
Accordingly, this action was not subject to review under the E.O. by 
the Office of Information and Regulatory Affairs (``OIRA'') in OMB.

B. Review Under the Regulatory Flexibility Act

    The Regulatory Flexibility Act (5 U.S.C. 601 et seq.) requires 
preparation of a final regulatory flexibility analysis (``FRFA'') for 
any final rule where the agency was first required by law to publish a 
proposed rule 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 (August 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 DOE rulemaking 
process. 68 FR 7990. DOE has made its procedures and policies available 
on the Office of the General Counsel's website: https://energy.gov/gc/office-general-counsel.
    DOE reviewed this final rule under the provisions of the Regulatory 
Flexibility Act and the procedures and policies published on February 
19, 2003. DOE has concluded that this final rule will not have a 
significant impact on a substantial number of small entities. The 
factual basis for this determination is as follows:
    The Small Business Administration (``SBA'') considers a business 
entity to be a small business, if, together with its affiliates, it 
employs less than a threshold number of workers or earns less than the 
average annual receipts specified in 13 CFR part 121. The threshold 
values set forth in these regulations use size standards and codes 
established by the North American Industry Classification System 
(``NAICS'') that are available at: www.sba.gov/document/support--table-size-standards. The threshold number for NAICS classification code 
335220, major household appliance manufacturing, which includes clothes 
dryer manufacturers, is 1,500 employees.
    Most of the manufacturers supplying clothes dryers are large 
multinational corporations. DOE collected data from DOE's compliance 
certification database \54\ and surveyed the AHAM member directory to 
identify manufacturers of clothes dryers. DOE then consulted publicly-
available data, purchased company reports from vendors such as Dun and 
Bradstreet, and contacted manufacturers, where needed, to determine if 
they meet the SBA's definition of a ``small business manufacturing 
facility'' and have their manufacturing facilities located within the 
United States. Based on this analysis, DOE did not identify any small 
businesses that manufacture clothes dryers covered by the proposed test 
procedure amendments.
---------------------------------------------------------------------------

    \54\ www.regulations.doe.gov/certification-data (Last accessed 
February 2, 2019).
---------------------------------------------------------------------------

    Additionally, as described in section III.G of this document, the 
amendments proposed in this test procedure will not increase costs to 
clothes dryer manufacturers. Therefore, DOE concludes that the cost 
effects accruing from the final rule will not have a ``significant 
economic impact on a substantial number of small entities,'' and that 
the preparation of a FRFA is not warranted. DOE has submitted a 
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 of 1995

    Manufacturers of clothes dryers must certify to DOE that their 
products comply with any applicable energy conservation standards. To 
certify compliance, manufacturers must first obtain test data for their 
products according to the DOE test procedures, including any amendments 
adopted for those test procedures. DOE has established regulations for 
the certification and recordkeeping requirements for all covered 
consumer products and commercial equipment, including clothes dryers. 
(See generally 10 CFR part 429) The collection-of-information 
requirement for the certification and recordkeeping is subject to 
review and approval by OMB under the Paperwork Reduction Act (``PRA''). 
This requirement has been approved by OMB under OMB control number 
1910-1400. Public reporting burden for the certification is estimated 
to average 35 hours per response, including the time for reviewing 
instructions, searching existing data sources, gathering and 
maintaining the data needed, and completing and reviewing the 
collection of information.
    Notwithstanding any other provision of the law, no person is 
required to respond to, nor shall any person be subject to a penalty 
for failure to comply with, a collection of information subject to the 
requirements of the PRA, unless that collection of information displays 
a currently valid OMB Control Number.

D. Review Under the National Environmental Policy Act of 1969

    In this final rule, DOE establishes test procedure amendments that 
it expects will be used to develop and implement future energy 
conservation standards for clothes dryers. DOE has determined that this 
rule falls into a class of actions that are categorically excluded from 
review under the National Environmental Policy Act of 1969 (42 U.S.C. 
4321 et seq.) and DOE's implementing regulations at 10 CFR part 1021. 
Specifically, DOE has determined that adopting test procedures for 
measuring energy efficiency of consumer products and industrial 
equipment is consistent with activities identified in 10 CFR part 1021, 
appendix A to subpart D, A5 and A6. Accordingly, neither an 
environmental assessment nor an environmental impact statement is 
required.

E. Review Under Executive Order 13132

    E.O. 13132, ``Federalism,'' 64 FR 43255 (August 4, 1999), imposes 
certain requirements on agencies formulating and implementing policies 
or regulations that preempt State law or that have federalism 
implications. The E.O. 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 E.O. 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

[[Page 56637]]

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 examined this final 
rule and determined that it will 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 final 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(d)) No further action is 
required by E.O. 13132.

F. Review Under Executive Order 12988

    Regarding the review of existing regulations and the promulgation 
of new regulations, section 3(a) of E.O. 12988, ``Civil Justice 
Reform,'' 61 FR 4729 (Feb. 7, 1996), 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. 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 
E.O. 12988 requires executive agencies to review regulations in light 
of applicable standards in sections 3(a) and 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 final rule 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 regulatory action resulting 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 small governments. On March 18, 1997, 
DOE published a statement of policy on its process for 
intergovernmental consultation under UMRA. 62 FR 12820; also available 
at https://energy.gov/gc/office-general-counsel. DOE examined this 
final rule according to UMRA and its statement of policy and determined 
that the rule contains neither an intergovernmental mandate, nor a 
mandate that may result in the expenditure of $100 million or more in 
any year, so these requirements 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 final rule will 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

    DOE has determined, under E.O. 12630, ``Governmental Actions and 
Interference with Constitutionally Protected Property Rights'' 53 FR 
8859 (March 18, 1988), that this regulation will not result in any 
takings that might require compensation under the Fifth Amendment to 
the U.S. Constitution.

J. Review Under 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 agencies to review most 
disseminations of information to the public under 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 final rule 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 OMB, a 
Statement of Energy Effects for any significant energy action. A 
``significant energy action'' is defined as any action by an agency 
that promulgated or is expected to lead to promulgation of a final 
rule, and that (1) is a significant regulatory action under E.O. 12866, 
or any successor 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 significant energy action, the agency must give a detailed 
statement of any adverse effects on energy supply, distribution, or use 
if the regulation is implemented, and of reasonable alternatives to the 
action and their expected benefits on energy supply, distribution, and 
use.
    This regulatory action is not a significant regulatory action under 
E.O. 12866. Moreover, it will not have a significant adverse effect on 
the supply, distribution, or use of energy, nor has it been designated 
as a significant energy action by the Administrator of OIRA. Therefore, 
it is not a significant energy action, and, accordingly, DOE has not 
prepared a Statement of Energy Effects.

L. Review Under Section 32 of the Federal Energy Administration Act of 
1974

    Under section 301 of the Department of Energy Organization Act 
(Pub. L. 95-91; 42 U.S.C. 7101), DOE must comply with section 32 of the 
Federal Energy Administration Act of 1974, as amended by the Federal 
Energy Administration

[[Page 56638]]

Authorization Act of 1977. (15 U.S.C. 788; ``FEAA'') Section 32 
essentially provides in relevant part that, where a proposed rule 
authorizes or requires use of commercial standards, the notice of 
proposed rulemaking must inform the public of the use and background of 
such standards. In addition, section 32(c) requires DOE to consult with 
the Attorney General and the Chairman of the FTC concerning the impact 
of the commercial or industry standards on competition.
    The modifications to the test procedure for clothes dryers adopted 
in this final rule incorporates testing methods contained in the 
following commercial standards: AHAM HLD-1-2010, IEC 62301 (Edition 
2.0, 2011-01). DOE has evaluated these standard and is unable to 
conclude whether it fully complies with the requirements of section 
32(b) of the FEAA (i.e., whether it was developed in a manner that 
fully provides for public participation, comment, and review.) DOE has 
consulted with both the Attorney General and the Chairman of the FTC 
about the impact on competition of using the methods contained in these 
standards and has received no comments objecting to their use.

M. Congressional Notification

    As required by 5 U.S.C. 801, DOE will report to Congress on the 
promulgation of this rule before its effective date. The report will 
state that it has been determined that the rule is not a ``major rule'' 
as defined by 5 U.S.C. 804(2).

N. Description of Materials Incorporated by Reference

    In this final rule, DOE incorporates by reference the industry 
standard published by AHAM, titled ``ANSI/AHAM HLD-1-2010 (``AHAM HLD-
1-2010''), Household Tumble Type Clothes Dryers, approved 2010'' which 
provides methods for testing and evaluating performance (i.e., moisture 
removal energy efficiency, drying time, and clothing load temperatures) 
of home laundry clothes drying equipment. Copies of ANSI/AHAM HLD-1-
2010 can be obtained from the Association of Home Appliance 
Manufacturers at 1111 19th Street NW, Suite 402, Washington, DC 20036, 
202-872-5955, or go to www.aham.org. Specifically, the test procedure 
codified by this final rule references section 3.3.5.1 ``Standard 
Simulator'' of AHAM HLD-1-2010, which provides specifications for an 
exhaust simulator.
    In this final rule DOE maintains the incorporation by reference to 
a test procedure published by IEC, titled IEC 62301, ``Household 
electrical appliances-Measurement of standby power'', (Edition 2.0, 
2011-01) (``IEC 62301''). Copies of IEC 62301 can be obtained from the 
International Electrotechnical Commission webstore, by going to https://webstore.iec.ch. Specifically, the test procedure codified by this 
final rule references Section 5, Paragraph 5.1 ``General,'' Note 1 and 
Section 5, Paragraph 5.3.2 ``Sampling Method'' of IEC 62301, which 
provides test conditions, testing equipment, and methods for measuring 
standby mode and off mode power consumption.

V. Approval of the Office of the Secretary

    The Secretary of Energy has approved publication of this final 
rule.

List of Subjects

10 CFR Part 429

    Administrative practice and procedure, Confidential business 
information, Energy conservation, Household appliances, Reporting and 
recordkeeping requirements.

10 CFR Part 430

    Administrative practice and procedure, Confidential business 
information, Energy conservation, Household appliances, Imports, 
Incorporation by reference, Intergovernmental relations, Small 
businesses.

Signing Authority

    This document of the Department of Energy was signed on October 1, 
2021, by Kelly Speakes-Backman, Principal Deputy Assistant Secretary 
and Acting 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 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 October 1, 2021.
Treena V. Garrett,
Federal Register Liaison Officer, U.S. Department of Energy.

    For the reasons stated in the preamble, DOE amends parts 429 and 
430 of chapter II of title 10, Code of Federal Regulations as set forth 
below:

PART 429--CERTIFICATION, COMPLIANCE, AND ENFORCEMENT FOR CONSUMER 
PRODUCTS AND COMMERCIAL AND INDUSTRIAL EQUIPMENT

0
1. The authority citation for part 429 continues to read as follows:

    Authority: 42 U.S.C. 6291-6317; 28 U.S.C. 2461 note.

0
2. Section 429.21 is amended by revising paragraph (b)(2) and adding 
paragraph (c) to read as follows:


Sec.  429.21  Residential clothes dryers.

* * * * *
    (b) * * *
    (2) Pursuant to Sec.  429.12(b)(13), a certification report shall 
include the following public product-specific information: When using 
appendix D1 to subpart B of part 430 of this chapter, the combined 
energy factor in pounds per kilowatt hours (lb/kWh), the capacity in 
cubic feet (cu ft), the voltage in volts (V) (for electric dryers 
only), an indication if the dryer has automatic termination controls, 
and the hourly Btu rating of the burner (for gas dryers only); when 
using appendix D2 to subpart B of part 430, the combined energy factor 
in pounds per kilowatt hours (lb/kWh), the capacity in cubic feet (cu 
ft), the voltage in volts (V) (for electric dryers only), an indication 
if the dryer has automatic termination controls, the hourly Btu rating 
of the burner (for gas dryers only), and a list of the cycle setting 
selections for the energy test cycle as recorded in section 3.4.7 of 
appendix D2 to subpart B of part 430.
    (c) Reported values. Values reported pursuant to this section must 
be rounded as follows: CEF to the nearest 0.01 lb/kWh, capacity to the 
nearest 0.1 cu ft, voltage to the nearest V, and hourly Btu rating to 
the nearest Btu.

PART 430--ENERGY CONSERVATION PROGRAM FOR CONSUMER PRODUCTS

0
3. The authority citation for part 430 continues read as follows:

    Authority: 42 U.S.C. 6291-6309; 28 U.S.C. 2461 note.

0
4. Section 430.3 is amended by revising paragraph (i)(3) to read as 
follows:


Sec.  430.3  Materials incorporated by reference.

* * * * *
    (i) * * *
    (3) ANSI/AHAM HLD-1-2010 (``AHAM HLD-1''), Household Tumble Type 
Clothes Dryers, ANSI-approved June 11, 2010, IBR approved for

[[Page 56639]]

appendices D1 and D2 to subpart B of this part.
* * * * *

0
5. Section 430.23 is amended by revising paragraph (d) to read as 
follows:


Sec.  430.23  Test procedures for the measurement of energy and water 
consumption.

* * * * *
    (d) Clothes dryers. (1) The estimated annual energy consumption for 
clothes dryers, expressed in kilowatt-hours per year, shall be the 
product of the annual representative average number of clothes dryer 
cycles as specified in appendix D1 or D2 to this subpart, as 
appropriate, and the per-cycle combined total energy consumption in 
kilowatt-hours per cycle, determined according to section 4.6 of 
appendix D1 or section 4.6 of appendix D2 to this subpart, as 
appropriate.
    (2) The estimated annual operating cost for clothes dryers shall 
be--
    (i) For an electric clothes dryer, the product of the following 
three factors, with the resulting product then being rounded off to the 
nearest dollar per year:
    (A) The annual representative average number of clothes dryer 
cycles as specified in appendix D1 or appendix D2 to this subpart, as 
appropriate;
    (B) The per-cycle combined total energy consumption in kilowatt-
hours per cycle, determined according to section 4.6 of appendix D1 or 
section 4.6 of appendix D2 to this subpart, as appropriate; and
    (C) The representative average unit cost of electrical energy in 
dollars per kilowatt-hour as provided by the Secretary; and
    (ii) For a gas clothes dryer, the product of the annual 
representative average number of clothes dryer cycles as specified in 
appendix D1 or D2 to this subpart, as appropriate, times the sum of the 
following three factors, with the resulting product then being rounded 
off to the nearest dollar per year:
    (A) The product of the per-cycle gas dryer electric energy 
consumption in kilowatt-hours per cycle, determined according to 
section 4.2 of appendix D1 or section 4.2 of appendix D2 to this 
subpart, as appropriate, times the representative average unit cost of 
electrical energy in dollars per kilowatt-hour as provided by the 
Secretary; plus,
    (B) The product of the per-cycle gas dryer gas energy consumption, 
in Btus per cycle, determined according to section 4.3 of appendix D1 
or section 4.3 of appendix D2 to this subpart, as appropriate, times 
the representative average unit cost for natural gas or propane, as 
appropriate, in dollars per Btu as provided by the Secretary; plus,
    (C) The product of the per-cycle standby mode and off mode energy 
consumption in kilowatt-hours per cycle, determined according to 
section 4.5 of appendix D1 or section 4.5 of appendix D2 to this 
subpart, as appropriate, times the representative average unit cost of 
electrical energy in dollars per kilowatt-hour as provided by the 
Secretary.
    (3) The combined energy factor, expressed in pounds per kilowatt-
hour is determined in accordance with section 4.7 of appendix D1 or 
section 4.7 of appendix D2 to this subpart, as appropriate, the result 
then being rounded off to the nearest hundredth (0.01).
    (4) Other useful measures of energy consumption for clothes dryers 
shall be those measures of energy consumption for clothes dryers which 
the Secretary determines are likely to assist consumers in making 
purchasing decisions and which are derived from the application of 
appendix D1 or D2 to this subpart, as appropriate.
* * * * *

Appendix D to Subpart B of Part 430--[Removed]

0
6. Appendix D to subpart B of part 430 is removed.

0
7. Appendix D1 to subpart B of part 430 is amended by:
0
a. Revising the introductory note;
0
b. Adding section 0;
0
c. Revising section 1.3;
0
d. Removing the word ``clothes'', in section 1.5, and adding in its 
place ``cloths'';
0
e. Removing sections 1.7 and 1.14;
0
f. Redesignating sections 1.8 through 1.11 as sections 1.7 through 
1.10, respectively, and section 1.13 as section 1.14;
0
g. Adding new sections 1.11 and 1.13;
0
h. Revising section 1.18;
0
i. Revising the first sentence of section 2.1.1 and revising section 
2.1.2;
0
j. Revising the first sentence of section 2.1.3;
0
k. Revising sections 2.2.1, 2.3.2.1, and 2.3.2.2;
0
l. Adding section 2.3.2.3;
0
m. Redesignating section 2.4.1 as section 2.4.1.1;
0
n. Adding new section 2.4.1;
0
o. Revising newly redesignated 2.4.1.1;
0
p. Removing the word ``Clothes'', in section 2.6, and adding in its 
place ``Cloths'';
0
q. Revising sections 2.7.1, 2.7.2, and 2.8.1;
0
r. In section 3.1, in the last sentence of the introductory text, 
adding the text ``to the nearest 0.1 cubic foot'' following the text 
``is calculated'';
0
s. Revising sections 3.3, 3.4.1, 3.4.2, 3.4.3, 3.6, 3.6.1, and 3.6.2;
0
t. Adding sections 3.6.3 and 3.6.4;
0
u. Revising sections 4.1, 4.2, 4.3, and 4.5;
0
v. Removing section 4.7; and
0
w. Redesignating section 4.8 as section 4.7.
    The revisions and additions read as follows:

Appendix D1 to Subpart B of Part 430--Uniform Test Method for Measuring 
the Energy Consumption of Clothes Dryers

    Note: The procedures in either this appendix or appendix D2 to 
this subpart must be used to determine compliance with energy 
conservation standards for clothes dryers manufactured on or after 
January 1, 2015. Manufacturers must use a single appendix for all 
representations, including certifications of compliance, and may not 
use this appendix for certain representations and appendix D2 to 
this subpart for other representations.

0. Incorporation by Reference

    DOE incorporated by reference in Sec.  430.3 the standards for 
AHAM HLD-1 and IEC 62301, in their entirety, however, only 
enumerated provisions of those documents are applicable to this 
appendix. In cases where there is a conflict between any industry 
standard(s) and this appendix, the language of the test procedure in 
this appendix takes precedence over the industry standard(s).
    (1) AHAM HLD-1:
    (i) Section 3.3.5.1 ``Standard Simulator'' as referenced in 
sections 2.1.2 through 2.1.3 of this appendix.
    (ii) [Reserved]
    (2) IEC 62301:
    (i) Section 5, Paragraph 5.1, Note 1 as referenced in section 
3.6.2 of this appendix.
    (ii) Section 5, Paragraph 5.3.2 ``Sampling Method'' as 
referenced in section 3.6.3 of this appendix.

1. * * *

    1.3 ``AHAM HLD-1'' means the test standard published by the 
Association of Home Appliance Manufacturers, titled ``Household 
Tumble Type Clothes Dryers,'' ANSI-approved June 11, 2010, ANSI/AHAM 
HLD-1-2010.
* * * * *
    1.11 ``Final moisture content'' (``FMC'') means the ratio of the 
weight of water contained by the dry test load (i.e., after 
completion of the drying cycle) to the bone-dry weight of the test 
load, expressed as a percent.
* * * * *
    1.13 ``Initial moisture content'' (``IMC'') means the ratio of 
the weight of water contained by the damp test load (i.e., prior to 
completion of the drying cycle) to the

[[Page 56640]]

bone-dry weight of the test load, expressed as a percent.
* * * * *
    1.18 ``Vented clothes dryer'' means a clothes dryer that 
exhausts the evaporated moisture from the cabinet.
* * * * *

2. * * *

    2.1.1 * * * For both vented clothes dryers and ventless clothes 
dryers, install the clothes dryer in accordance with manufacturer's 
instructions as shipped with the unit. * * *
    2.1.2 Vented clothes dryers. For vented clothes dryers, the 
dryer exhaust shall be restricted by adding the AHAM exhaust 
simulator described in section 3.3.5.1 of AHAM HLD-1.
    2.1.3 * * * For ventless clothes dryers, the dryer shall be 
tested without the AHAM exhaust simulator. * * *
* * * * *
    2.2.1 For drying testing, maintain the room ambient air 
temperature at 75 3 [deg]F and the room relative 
humidity at 50 percent 10 percent relative humidity.
* * * * *
    2.3.2.1 Natural gas supply. Maintain the gas supply to the 
clothes dryer immediately ahead of all controls at a pressure of 7 
to 10 inches of water column. The natural gas supplied should have a 
heating value of approximately 1,025 Btus per standard cubic foot. 
The actual heating value, Hn2, in Btus per standard cubic 
foot, for the natural gas to be used in the test shall be obtained 
either from measurements using a standard continuous flow 
calorimeter as described in section 2.4.6 of this appendix or by the 
purchase of bottled natural gas whose Btu rating is certified to be 
at least as accurate a rating as could be obtained from measurements 
with a standard continuous flow calorimeter as described in section 
2.4.6 of this appendix.
    2.3.2.2 Propane gas supply. Maintain the gas supply to the 
clothes dryer immediately ahead of all controls at a pressure of 11 
to 13 inches of water column. The propane gas supplied should have a 
heating value of approximately 2,500 Btus per standard cubic foot. 
The actual heating value, Hp, in Btus per standard cubic 
foot, for the propane gas to be used in the test shall be obtained 
either from measurements using a standard continuous flow 
calorimeter as described in section 2.4.6 of this appendix or by the 
purchase of bottled gas whose Btu rating is certified to be at least 
as accurate a rating as could be obtained from measurement with a 
standard continuous calorimeter as described in section 2.4.6 of 
this appendix.
    2.3.2.3 Hourly Btu Rating. Maintain the hourly Btu rating of the 
burner within 5 percent of the rating specified by the 
manufacturer. If the hourly Btu rating of the burner cannot be 
maintained within 5 percent of the rating specified by 
the manufacturer, make adjustments in the following order until an 
hourly Btu rating of the burner within 5 percent of the 
rating specified by the manufacturer is achieved:
    (1) Modify the gas inlet supply pressure within the allowable 
range specified in section 2.3.2.1 or 2.3.2.2 of this appendix, as 
applicable;
    (2) If the clothes dryer is equipped with a gas pressure 
regulator, modify the outlet pressure of the gas pressure regulator 
within 10 percent of the value recommended by the 
manufacturer in the installation manual, on the nameplate sticker, 
or wherever the manufacturer makes such a recommendation for the 
basic model; and
    (3) Modify the orifice as necessary to achieve the required 
hourly Btu rating.
* * * * *
    2.4.1 Weighing scales.
    2.4.1.1 Weighing scale for test cloth. The scale shall have a 
range of 0 to a maximum of 60 pounds with a resolution of at least 
0.001 pounds and a maximum error no greater than 0.1 percent of any 
measured value within the range of 3 to 15 pounds.
* * * * *
    2.7.1 Load size. Determine the load size for the unit under 
test, according to Table 1 of this section.

                           Table 1--Test Loads
------------------------------------------------------------------------
              Unit under test                Test load (bone dry weight)
------------------------------------------------------------------------
Standard size clothes dryer...............  8.45 pounds 
                                             .085 pounds.
Compact size clothes dryer................  3.00 pounds  .03
                                             pounds.
------------------------------------------------------------------------

    Each test load must consist of energy test cloths and no more 
than five energy stuffer cloths.
    2.7.2 Test load preparation. Dampen the load by agitating it in 
water whose temperature is 60 [deg]F  5 [deg]F and 
consists of 0 to 17 parts per million hardness for approximately 2 
minutes in order to saturate the fabric. Then, extract water from 
the wet test load by spinning the load to a target moisture content 
between 54.0-61.0 percent of the bone-dry weight of the test load. 
If after extraction the moisture content is less than 54.0 percent, 
make a final mass adjustment, such that the moisture content is 
between 54.0-61.0 percent of the bone-dry weight of the test load, 
by adding water uniformly distributed among all of the test cloths 
in a very fine spray using a spray bottle.
* * * * *
    2.8.1 Vented clothes dryers. For vented clothes dryers, before 
any test cycle, operate the dryer without a test load in the non-
heat mode for 15 minutes or until the discharge air temperature is 
varying less than 1 [deg]F for 10 minutes--whichever is longer--in 
the test installation location with the ambient conditions within 
the specified test condition tolerances of section 2.2 of this 
appendix.
* * * * *

3. * * *

    3.3 Test cycle. Operate the clothes dryer at the maximum 
temperature setting and, if equipped with a timer, at the maximum 
time setting. Any other optional cycle settings that do not affect 
the temperature or time settings shall be tested in the as-shipped 
position, except that if the clothes dryer has network capabilities, 
the network settings must be disabled throughout testing if such 
settings can be disabled by the end-user and the product's user 
manual provides instructions on how to do so. If the network 
settings cannot be disabled by the end-user, or the product's user 
manual does not provide instruction for disabling network settings, 
then the unit must be tested with the network settings in the 
factory default configuration for the test cycle. If the clothes 
dryer does not have a separate temperature setting selection on the 
control panel, the maximum time setting should be used for the 
drying test cycle. Dry the load until the moisture content of the 
test load is between 2.5 and 5.0 percent of the bone-dry weight of 
the test load, at which point the test cycle is stopped, but do not 
permit the dryer to advance into cool down. If required, reset the 
timer to increase the length of the drying cycle. After stopping the 
test cycle, remove and weigh the test load within 5 minutes 
following termination of the test cycle. The clothes dryer shall not 
be stopped intermittently in the middle of the test cycle for any 
reason. Record the data specified by section 3.4 of this appendix. 
If the dryer automatically stops during a cycle because the 
condensation box is full of water, the test is stopped, and the test 
run is invalid, in which case the condensation box shall be emptied 
and the test re-run from the beginning. For ventless clothes dryers, 
during the time between two cycles, the door of the dryer shall be 
closed except for loading and unloading.
* * * * *
    3.4.1 Bone-dry weight of the test load, Wbonedry, as 
described in section 2.7.1 of this appendix.
    3.4.2 Moisture content of the wet test load before the test, 
IMC, as described in section 2.7.2 of this appendix.
    3.4.3 Moisture content of the dry test load obtained after the 
test, FMC, as described in section 3.3 of this appendix.
* * * * *
    3.6 Standby mode and off mode power. Connect the clothes dryer 
to a watt meter as specified in section 2.4.7 of this appendix. 
Establish the testing conditions set forth in section 2 of this 
appendix.
    3.6.1 Perform standby mode and off mode testing after completion 
of an active mode drying cycle included as part of the test cycle; 
after removing the test load; without changing the control panel 
settings used for the active mode drying cycle; with the door 
closed; and without disconnecting the electrical energy supply to 
the clothes dryer between completion of the active mode drying cycle 
and the start of standby mode and off mode testing.
    3.6.2 For clothes dryers that take some time to automatically 
enter a stable inactive mode or off mode state from a higher power 
state as discussed in Section 5, Paragraph 5.1, Note 1 of IEC 62301, 
allow sufficient time for the clothes dryer to automatically reach 
the default inactive/off mode state before proceeding with the test 
measurement.
    3.6.3 Once the stable inactive/off mode state has been reached, 
measure and record the default inactive/off mode power, 
Pdefault, in watts, following the test procedure for the 
sampling method specified in Section 5, Paragraph 5.3.2 of IEC 
62301.

[[Page 56641]]

    3.6.4 For a clothes dryer with a switch (or other means) that 
can be optionally selected by the end user to achieve a lower-power 
inactive/off mode state than the default inactive/off mode state 
measured in section 3.6.3 of this appendix, after performing the 
measurement in section 3.6.3 of this appendix, activate the switch 
(or other means) to the position resulting in the lowest power 
consumption and repeat the measurement procedure described in 
section 3.6.3 of this appendix. Measure and record the lowest 
inactive/off mode power, Plowest, in watts.

4. * * *

    4.1 Total per-cycle electric dryer energy consumption. Calculate 
the total electric dryer energy consumption per cycle, 
Ece, expressed in kilowatt-hours per cycle and defined 
as:

Ece = [53.5/(IMC - FMC)] x Et x field use,

Where:

Et = the energy recorded in section 3.4.5 of this 
appendix.
53.5 = an experimentally established value for the percent reduction 
in the moisture content of the test load during a laboratory test 
cycle expressed as a percent.
field use = field use factor,
= 1.18 for clothes dryers with time termination control systems only 
without any automatic termination control functions.
= 1.04 for clothes dryers with automatic control systems that meet 
the requirements of the definition for automatic termination control 
in section 1.4 of this appendix, including those that also have a 
supplementary timer control, or that may also be manually 
controlled.
IMC = the moisture content of the wet test load as recorded in 
section 3.4.2 of this appendix.
FMC = the moisture content of the dry test load as recorded in 
section 3.4.3 of this appendix.

    4.2 Per-cycle gas dryer electrical energy consumption. Calculate 
the gas dryer electrical energy consumption per cycle, 
Ege, expressed in kilowatt-hours per cycle and defined 
as:

Ege = [53.5/(IMC - FMC)] x Ete x field use,

Where:

Ete = the energy recorded in section 3.4.6.1 of this 
appendix.

field use, 53.5, MCw, and MCd as defined in 
section 4.1 of this appendix.

    4.3 Per-cycle gas dryer gas energy consumption. Calculate the 
gas dryer gas energy consumption per cycle, Egg, 
expressed in Btus per cycle and defined as:

Egg = [53.5/(MCw - MCd)] x 
Etg x field use x GEF

Where:

Etg = the energy recorded in section 3.4.6.2 of this 
appendix.
GEF = corrected gas heat value (Btu per cubic feet) as defined in 
section 3.4.6.3 of this appendix.
field use, 53.5, IMC, and FMC as defined in section 4.1 of this 
appendix.

* * * * *
    4.5 Per-cycle standby mode and off mode energy consumption. 
Calculate the clothes dryer per-cycle standby mode and off mode 
energy consumption, ETSO, expressed in kilowatt-hours per 
cycle and defined as:

ETSO = [(Pdefault x Sdefault) + 
(Plowest x Slowest)] x K/283

Where:

Pdefault = Default inactive/off mode power, in watts, as 
measured in section 3.6.3 of this appendix.
Plowest = Lowest inactive/off mode power, in watts, as 
measured in section 3.6.4 of this appendix for clothes dryer with a 
switch (or other means) that can be optionally selected by the end 
user to achieve a lower-power inactive/off mode than the default 
inactive/off mode; otherwise, Plowest=0.
Sdefault = Annual hours in default inactive/off mode, 
defined as 8,620 if no optional lowest-power inactive/off mode is 
available; otherwise 4,310.
Slowest = Annual hours in lowest-power inactive/off mode, 
defined as 0 if no optional lowest-power inactive/off mode is 
available; otherwise 4,310.
K = Conversion factor of watt-hours to kilowatt-hours = 0.001.
283 = Representative average number of clothes dryer cycles in a 
year.
8,620 = Combined annual hours for inactive and off mode.
4,310 = One-half of the combined annual hours for inactive and off 
mode.

* * * * *

0
8. Appendix D2 to subpart B of part 430 is amended by:
0
a. Revising the introductory note;
0
b. Adding section 0;
0
c. Revising section 1.3;
0
d. Removing the word ``clothes'', in section 1.6, and adding in its 
place ``cloths'';
0
e. Removing sections 1.8, 1.15, and 1.19;
0
f. Redesignating sections 1.9 through 1.11 as sections 1.8 through 
1.10, sections 1.13 and 1.14 as sections 1.14 and 1.15, and section 
1.20 as section 1.19;
0
g. Adding new sections 1.11, 1.13, and 1.20;
0
h. Removing the word ``clasification'', in section 1.16, and adding in 
its place ``classification'';
0
i. Revising the first sentence of section 2.1.1 and revising section 
2.1.2;
0
j. Revising the first sentence of section 2.1.3;
0
k. Revising sections 2.2.1, 2.3.2.1, and 2.3.2.2;
0
l. Adding section 2.3.2.3;
0
m. Redesignating section 2.4.1 as section 2.4.1.1;
0
n. Adding new section 2.4.1;
0
o. Revising newly redesignated 2.4.1.1;
0
p. Revising sections 2.7.1, 2.7.2, and 2.8.1;
0
q. In section 3.1, in the last sentence of the introductory text, 
adding the text ``to the nearest 0.1 cubic foot'' following the text 
``is calculated'';
0
r. Revising sections 3.3.1, 3.3.2, 3.4.1, 3.4.2, and 3.4.3;
0
s. Removing section 3.5;
0
t. Redesignating sections 3.6, 3.6.1, and 3.6.2 as sections 3.5, 3.5.1, 
and 3.5.2, respectively;
0
u. Revising newly redesignated sections 3.5, 3.5.1, and 3.5.2;
0
v. Adding sections 3.5.3 and 3.5.4;
0
w. Revising sections 4.1, 4.2, 4.3, 4.4, and 4.5;
0
x. Adding section 4.5.1;
0
y. Removing section 4.7; and
0
z. Redesignating section 4.8 as section 4.7.
    The revisions and additions read as follows:

Appendix D2 to Subpart B of Part 430--Uniform Test Method for Measuring 
the Energy Consumption of Clothes Dryer

    Note: The procedures in either appendix D1 to this subpart or 
this appendix must be used to determine compliance with energy 
conservation standards for clothes dryers manufactured on or after 
January 1, 2015. Manufacturers must use a single appendix for all 
representations, including certifications of compliance, and may not 
use appendix D1 to this subpart for certain representations and this 
appendix for other representations. Per-cycle standby mode and off 
mode energy consumption in section 4.5 of this appendix is 
calculated using the value for the annual representative average 
number of clothes dryer cycles in a year specified in section 
4.5.1(a) of this appendix until the compliance date of any amended 
energy conservation standards for these products. Beginning on the 
compliance date of any amended energy conservation standards for 
these products per-cycle standby mode and off mode energy 
consumption in section 4.5 of this appendix is calculated using the 
value for the annual representative average number of clothes dryer 
cycles in a year specified in section 4.5.1(b) of this appendix.

0. Incorporation by Reference

    DOE incorporated by reference in Sec.  430.3 the entire standard 
for AHAM HLD-1 and IEC 62301, however, only enumerated provisions of 
those documents are applicable to this appendix. In cases where 
there is a conflict between any industry standard(s) and this 
appendix, the language of the test procedure in this appendix takes 
precedence over the industry standard(s).
    (1) AHAM HLD-1:
    (i) Section 3.3.5.1 ``Standard Simulator'' as referenced in 
sections 2.1.2 through 2.1.3 of this appendix.
    (ii) [Reserved]
    (2) IEC 62301:
    (i) Section 5, Paragraph 5.1, Note 1 as referenced in section 
3.5.2 of this appendix.
    (ii) Section 5, Paragraph 5.3.2 ``Sampling Method'' as 
referenced in section 3.5.3 of this appendix.
* * * * *

[[Page 56642]]

1. * * *

    1.3 ``AHAM HLD-1'' means the test standard published by the 
Association of Home Appliance Manufacturers, titled ``Household 
Tumble Type Clothes Dryers,'' ANSI-approved June 11, 2010, ANSI/AHAM 
HLD-1-2010.
* * * * *
    1.11 ``Final moisture content'' (``FMC'') means the ratio of the 
weight of water contained by the dry test load (i.e., after 
completion of the drying cycle) to the bone-dry weight of the test 
load, expressed as a percent.
* * * * *
    1.13 ``Initial moisture content'' (``IMC'') means the ratio of 
the weight of water contained by the damp test load (i.e., prior to 
completion of the drying cycle) to the bone-dry weight of the test 
load, expressed as a percent.
* * * * *
    1.20 ``Vented clothes dryer'' means a clothes dryer that 
exhausts the evaporated moisture from the cabinet.
* * * * *

2. * * *

    2.1.1 * * * For both vented clothes dryers and ventless clothes 
dryers, install the clothes dryer in accordance with manufacturer's 
instructions as shipped with the unit. * * *
    2.1.2 Vented clothes dryers. For vented clothes dryers, the 
dryer exhaust shall be restricted by adding the AHAM exhaust 
simulator described in section 3.3.5.1 of AHAM HLD-1.
    2.1.3 * * * For ventless clothes dryers, the dryer shall be 
tested without the AHAM exhaust simulator. * * *
* * * * *
    2.2.1 For drying testing, maintain the room ambient air 
temperature at 75 3 F and the room relative humidity at 
50 percent 10 percent relative humidity.
* * * * *
    2.3.2.1 Natural gas supply. Maintain the gas supply to the 
clothes dryer immediately ahead of all controls at a pressure of 7 
to 10 inches of water column. The natural gas supplied should have a 
heating value of approximately 1,025 Btus per standard cubic foot. 
The actual heating value, Hn2, in Btus per standard cubic 
foot, for the natural gas to be used in the test shall be obtained 
either from measurements using a standard continuous flow 
calorimeter as described in section 2.4.6 of this appendix or by the 
purchase of bottled natural gas whose Btu rating is certified to be 
at least as accurate a rating as could be obtained from measurements 
with a standard continuous flow calorimeter as described in section 
2.4.6 of this appendix.
    2.3.2.2 Propane gas supply. Maintain the gas supply to the 
clothes dryer immediately ahead of all controls at a pressure of 11 
to 13 inches of water column. The propane gas supplied should have a 
heating value of approximately 2,500 Btus per standard cubic foot. 
The actual heating value, Hp, in Btus per standard cubic 
foot, for the propane gas to be used in the test shall be obtained 
either from measurements using a standard continuous flow 
calorimeter as described in section 2.4.6 of this appendix or by the 
purchase of bottled gas whose Btu rating is certified to be at least 
as accurate a rating as could be obtained from measurement with a 
standard continuous calorimeter as described in section 2.4.6 of 
this appendix.
    2.3.2.3 Hourly Btu Rating. Maintain the hourly Btu rating of the 
burner within 5 percent of the rating specified by the 
manufacturer. If the hourly Btu rating of the burner cannot be 
maintained within 5 percent of the rating specified by 
the manufacturer, make adjustments in the following order until an 
hourly Btu rating of the burner within 5 percent of the 
rating specified by the manufacturer is achieved:
    (1) Modify the gas inlet supply pressure within the allowable 
range specified in section 2.3.2.1 or 2.3.2.2 of this appendix, as 
applicable;
    (2) If the clothes dryer is equipped with a gas pressure 
regulator, modify the outlet pressure of the gas pressure regulator 
within 10 percent of the value recommended by the 
manufacturer in the installation manual, on the nameplate sticker, 
or wherever the manufacturer makes such a recommendation for the 
basic model; and
    (3) Modify the orifice as necessary to achieve the required 
hourly Btu rating.
* * * * *
    2.4.1 Weighing scales.
    2.4.1.1 Weighing scale for test cloth. The scale shall have a 
range of 0 to a maximum of 60 pounds with a resolution of at least 
0.001 pounds and a maximum error no greater than 0.1 percent of any 
measured value within the range of 3 to 15 pounds.
* * * * *
    2.7.1 Load size. Determine the load size for the unit under 
test, according to Table 1 of this section.

                           Table 1--Test Loads
------------------------------------------------------------------------
              Unit under test                Test load (bone dry weight)
------------------------------------------------------------------------
Standard size clothes dryer...............  8.45 pounds 
                                             .085 pounds.
Compact size clothes dryer................  3.00 pounds  .03
                                             pounds.
------------------------------------------------------------------------

    Each test load must consist of energy test cloths and no more 
than five energy stuffer cloths.
    2.7.2 Test load preparation. Dampen the load by agitating it in 
water whose temperature is 60 [deg]F 5 [deg]F and 
consists of 0 to 17 parts per million hardness for approximately 2 
minutes to saturate the fabric. Then, extract water from the wet 
test load by spinning the load until the moisture content of the 
load is between 52.5 and 57.5 percent of the bone-dry weight of the 
test load. Make a final mass adjustment, such that the moisture 
content is 57.5 percent 0.33 percent by adding water 
uniformly distributed among all of the test cloths in a very fine 
spray using a spray bottle.
* * * * *
    2.8.1 Vented clothes dryers. For vented clothes dryers, before 
any test cycle, operate the dryer without a test load in the non-
heat mode for 15 minutes or until the discharge air temperature is 
varying less than 1 [deg]F for 10 minutes--whichever is longer--in 
the test installation location with the ambient conditions within 
the specified test condition tolerances of section 2.2 of this 
appendix.
* * * * *

3. * * *

    3.3.1 Timer dryers. For timer dryers, operate the clothes dryer 
at the maximum temperature setting and, if equipped with a timer, at 
the maximum time setting. Any other optional cycle settings that do 
not affect the temperature or time settings shall be tested in the 
as-shipped position, except that if the clothes dryer has network 
capabilities, the network settings must be disabled throughout 
testing if such settings can be disabled by the end-user and the 
product's user manual provides instructions on how to do so. If the 
network settings cannot be disabled by the end-user, or the 
product's user manual does not provide instruction for disabling 
network settings, then the unit must be tested with the network 
settings in the factory default configuration for the test cycle. If 
the clothes dryer does not have a separate temperature setting 
selection on the control panel, the maximum time setting should be 
used for the drying test cycle. Dry the load until the moisture 
content of the test load is between 1 and 2.5 percent of the bone-
dry weight of the test load, at which point the test cycle is 
stopped, but do not permit the dryer to advance into cool down. If 
required, reset the timer to increase the length of the drying 
cycle. After stopping the test cycle, remove and weigh the test load 
within 5 minutes following termination of the test cycle. The 
clothes dryer shall not be stopped intermittently in the middle of 
the test cycle for any reason. Record the data specified by section 
3.4 of this appendix. If the dryer automatically stops during a 
cycle because the condensation box is full of water, the test is 
stopped, and the test run is invalid, in which case the condensation 
box shall be emptied and the test re-run from the beginning. For 
ventless clothes dryers, during the time between two cycles, the 
door of the dryer shall be closed except for loading and unloading.
    3.3.2 Automatic termination control dryers. For automatic 
termination control dryers, a ``normal'' program shall be selected 
for the test cycle. For dryers that do not have a ``normal'' 
program, the cycle recommended by the manufacturer for drying cotton 
or linen clothes shall be selected. Where the drying temperature 
setting can be chosen independently of the program, it shall be set 
to the maximum. Where the dryness level setting can be chosen 
independently of the program, it shall be set to the ``normal'' or 
``medium'' dryness level setting. If such designation is not 
provided, then the dryness level shall be set at the mid-point 
between the minimum and maximum settings. If an even number of 
discrete settings are provided, use the next-highest setting above 
the midpoint, in the direction of the maximum dryness setting or 
next-lowest setting below the midpoint, in the direction of the 
minimum dryness setting. Any other

[[Page 56643]]

optional cycle settings that do not affect the program, temperature 
or dryness settings shall be tested in the as-shipped position, 
except that if the clothes dryer has network capabilities, the 
network settings must be disabled throughout testing if such 
settings can be disabled by the end-user and the product's user 
manual provides instructions on how to do so. If the network 
settings cannot be disabled by the end-user, or the product's user 
manual does not provide instruction for disabling network settings, 
then the unit must be tested with the network settings in the 
factory default configuration for the test cycle.
    Operate the clothes dryer until the completion of the programmed 
cycle, including the cool down period. The cycle shall be considered 
complete when the dryer indicates to the user that the cycle has 
finished (by means of a display, indicator light, audible signal, or 
other signal) and the heater and drum/fan motor shuts off for the 
final time. If the clothes dryer is equipped with a wrinkle 
prevention mode (i.e., that continuously or intermittently tumbles 
the clothes dryer drum after the clothes dryer indicates to the user 
that the cycle has finished) that is activated by default in the as-
shipped position or if manufacturers' instructions specify that the 
feature is recommended to be activated for normal use, the cycle 
shall be considered complete after the end of the wrinkle prevention 
mode. After the completion of the test cycle, remove and weigh the 
test load within 5 minutes following termination of the test cycle. 
Record the data specified in section 3.4 of this appendix. If the 
final moisture content is greater than 2 percent, the results from 
the test are invalid and a second run must be conducted. Conduct the 
second run of the test on the unit using the highest dryness level 
setting. If, on this second run, the dryer does not achieve a final 
moisture content of 2 percent or lower, the dryer has not 
sufficiently dried the clothes and the test results may not be used 
for certification of compliance with energy conservation standards. 
If the dryer automatically stops during a cycle because the 
condensation box is full of water, the test is stopped, and the test 
run is invalid, in which case the condensation box shall be emptied 
and the test re-run from the beginning. For ventless clothes dryers, 
during the time between two cycles, the door of the dryer shall be 
closed except for loading and unloading.
* * * * *
    3.4.1 Bone-dry weight of the test load, Wbonedry, as 
described in section 2.7.1 of this appendix.
    3.4.2 Moisture content of the wet test load before the test, 
IMC, as described in section 2.7.2 of this appendix.
    3.4.3 Moisture content of the dry test load obtained after the 
test, FMC, as described in section 3.3 of this appendix.
* * * * *
    3.5 Standby mode and off mode power. Connect the clothes dryer 
to a watt meter as specified in section 2.4.7 of this appendix. 
Establish the testing conditions set forth in section 2 of this 
appendix.
    3.5.1 Perform standby mode and off mode testing after completion 
of an active mode drying cycle included as part of the test cycle; 
after removing the test load; without changing the control panel 
settings used for the active mode drying cycle; with the door 
closed; and without disconnecting the electrical energy supply to 
the clothes dryer between completion of the active mode drying cycle 
and the start of standby mode and off mode testing.
    3.5.2 For clothes dryers that take some time to automatically 
enter a stable inactive mode or off mode state from a higher power 
state as discussed in Section 5, Paragraph 5.1, Note 1 of IEC 62301, 
allow sufficient time for the clothes dryer to automatically reach 
the default inactive/off mode state before proceeding with the test 
measurement.
    3.5.3 Once the stable inactive/off mode state has been reached, 
measure and record the default inactive/off mode power, 
Pdefault, in watts, following the test procedure for the 
sampling method specified in Section 5, Paragraph 5.3.2 of IEC 
62301.
    3.5.4 For a clothes dryer with a switch (or other means) that 
can be optionally selected by the end user to achieve a lower-power 
inactive/off mode state than the default inactive/off mode state 
measured in section 3.5.3 of this appendix, after performing the 
measurement in section 3.5.3 of this appendix, activate the switch 
(or other means) to the position resulting in the lowest power 
consumption and repeat the measurement procedure described in 
section 3.5.3 of this appendix. Measure and record the lowest 
inactive/off mode power, Plowest, in watts.

4. * * *

    4.1 Total per-cycle electric dryer energy consumption. Calculate 
the total per-cycle electric dryer energy consumption required to 
achieve a final moisture content of 2 percent or less, 
Ece, expressed in kilowatt-hours per cycle and defined 
as:

Ece = Et,
for automatic termination control dryers, and,
Ece = [55.5/(IMC-FMC)] x Et x field use,
for timer dryers

Where:

55.5 = an experimentally established value for the percent reduction 
in the moisture content of the test load during a laboratory test 
cycle expressed as a percent.
Et = the energy recorded in section 3.4.5 of this 
appendix.
field use = 1.18, the field use factor for clothes dryers with time 
termination control systems only without any automatic termination 
control functions.
IMC = the moisture content of the wet test load as recorded in 
section 3.4.2 of this appendix.
FMC = the moisture content of the dry test load as recorded in 
section 3.4.3 of this appendix.

    4.2 Per-cycle gas dryer electrical energy consumption. Calculate 
the per-cycle gas dryer electrical energy consumption required to 
achieve a final moisture content of 2 percent or less, 
Ege, expressed in kilowatt-hours per cycle and defined 
as:

Ege = Ete,
for automatic termination control dryers, and,
Ege = [55.5/(IMC-FMC)] x Ete x field use,
for timer dryers

Where:

Ete = the energy recorded in section 3.4.6.1 of this 
appendix.
field use, 55.5, IMC, and FMC as defined in section 4.1 of this 
appendix.

    4.3 Per-cycle gas dryer gas energy consumption. Calculate the 
per-cycle gas dryer gas energy consumption required to achieve a 
final moisture content of 2 percent or less, Egg, 
expressed in Btus per cycle and defined as:

Egg = Etg x GEF
for automatic termination control dryers, and,
Egg = [55.5/(IMC-FMC)] x Etg x field use x GEF
for timer dryers

Where:

Etg = the energy recorded in section 3.4.6.2 of this 
appendix.
GEF = corrected gas heat value (Btu per cubic foot) as defined in 
section 3.4.6.3 of this appendix,
field use, 55.5, IMC, and FMC as defined in section 4.1 of this 
appendix.

    4.4 Total per-cycle gas dryer energy consumption expressed in 
kilowatt-hours. Calculate the total per-cycle gas dryer energy 
consumption required to achieve a final moisture content of 2 
percent or less, Ecg, expressed in kilowatt-hours per 
cycle and defined as:

Ecg = Ege + (Egg/3412 Btu/kWh)

Where:

Ege = the energy calculated in section 4.2 of this 
appendix
Egg = the energy calculated in section 4.3 of this 
appendix

    4.5 Per-cycle standby mode and off mode energy consumption. 
Calculate the clothes dryer per-cycle standby mode and off mode 
energy consumption, ETSO, expressed in kilowatt-hours per 
cycle and defined as:

ETSO = [(Pdefault x Sdefault) + 
(Plowest x Slowest)] x K/Cannual

Where:

Pdefault = Default inactive/off mode power, in watts, as 
measured in section 3.5.3 of this appendix.
Plowest = Lowest inactive/off mode power, in watts, as 
measured in section 3.5.4 of this appendix for clothes dryer with a 
switch (or other means) that can be optionally selected by the end 
user to achieve a lower-power inactive/off mode than the default 
inactive/off mode; otherwise, Plowest =0.
Sdefault = Annual hours in default inactive/off mode, 
defined as 8,620 if no optional lowest-power inactive/off mode is 
available; otherwise 4,310.
Slowest = Annual hours in lowest-power inactive/off mode, 
defined as 0 if no optional lowest-power inactive/off mode is 
available; otherwise 4,310.
K = Conversion factor of watt-hours to kilowatt-hours = 0.001.
Cannual = Representative average number of clothes dryer 
cycles in a year as specified in section 4.5.1.

[[Page 56644]]

8,620 = Combined annual hours for inactive and off mode.
4,310 = One-half of the combined annual hours for inactive and off 
mode.

    4.5.1 Representative average number of clothes dryer cycles in a 
year. Per the Introductory Note:

(1) Cannual = 283
(2) Cannual = 236
* * * * *
[FR Doc. 2021-21810 Filed 10-7-21; 8:45 am]
BILLING CODE 6450-01-P