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Federal Register / Vol. 86, No. 158 / Thursday, August 19, 2021 / Rules and Regulations
lotter on DSK11XQN23PROD with RULES1

kJ/kilogram kg of air 17 in its fan definition. As discussed, the specific ratio is often used to separate fans specific ratio less than or equal to 1.11, blowers specific ratio greater than 1.11
and less than or equal to 1.20, and compressors specific ratio greater than 1.20, however, ASME states that this distinction in common practice is imprecise.18 The ISO 13349:2010, FansVocabulary and definitions of categories 19 defines fans based on a maximum energy limit of 25 kJ/kg of air and indicates that this is equivalent to a specific ratio of 1.3. DOE presented this information to the Working Group.
Docket No. EERE2013BTSTD0006;
Public Meeting Presentation, No. 106, at p. 47. Subsequently, the Working Group developed a draft definition of fan as follows: a rotary bladed machine used to convert power to air power with an energy output limited to 25 kJ/kg of air; typically consisting of an impeller, a shaft, bearings, a structure or housing, transmission, driver, and control if included by the manufacturer at the time of sale. The Working Group noted that this definition was still a work in progress and that AMCA would consult its technical committee to confirm the value used to characterize the energy output limit Docket No. EERE2013
BTSTD0006; Public Meeting Presentation, No. 106, at pp. 45, 47.
Subsequently, AMCAs fan technical committee commented in support of the Working Groups definition. Docket No.
EERE2013BTSTD0006; AMCA, No.
74, at p. 1 This definition was later included as a draft working definition in a draft term sheet with some modifications as follows: a rotary bladed machine used to convert power to air power, with an energy output limited to 25 kJ/kg of air, consisting of an impeller, a shaft, bearings, and a structure or housing; and includes any transmissions, driver, and/or controls if integrated, assembled, or packaged by the manufacturer at the time of sale.
Docket No. EERE2013BTSTD0006;
Draft Term Sheet, No. 143 at p. 1 The approved term sheet did not include a recommended definition of fan, as the definition established by the Working Group was still considered a draft definition at the time. Docket No.
EERE2013BTSTD0006; Public 17 This value characterizes the increase in pressure of the air being moved by the fan. An energy output of 25 kJ/kg is equivalent to a pressure ratio of 1.3. For an air density of 1.2 kg/m3, the fan pressure is 1.2 25 kJ/kg, i.e., 30 kPa, and the pressure ratio is calculated as 100+30/100 = 1.30
where atmospheric pressure = 100 kPa.
18 ASME PTC 112008 Standard: Fans. Available at www.asme.org.
19 ISO 13349:2010 FansVocabulary and definitions of categories. Available at www.iso.org.

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Meeting Transcript, No. 165 at p. 76
Ingersoll Rand/Trane, commented in support of the fan definition as drafted by the Working Group Docket No.
EERE2013BTSTD0006; Ingersoll Rand/Trane, No. 153 at p. 6.
A recent industry test procedure, AMCA 21421,20 includes a definition similar to that drafted by the Working Group. AMCA 21421 defines a fan as follows: a rotary bladed machine used to convert electrical or mechanical power to air power, with an energy output limited to 25 kJ/kg of air. It consists of an impeller, a shaft and bearings and/or driver to support the impeller, as well as a structure or housing. A fan may include a transmission, driver, and/or motor controller.
In the May 2021 RFI, DOE requested comments on this definition and the potential addition of the descriptor commercial and industrial with the term fan to clarify that the subject fans are industrial equipment and that the term excludes ceiling fans and furnace fans, both covered products defined at 10 CFR 430.2. In the May 2021 RFI, DOE also initially determined that the terms fan and blower can be used interchangeably. 86 FR 24752, 24754.
In response to the May 2021 RFI, ASAP/NRDC supported the adoption of the AMCA 21421 definition of fan as the definition for commercial and industrial fans. ASAP/NRDC, No. 14, at p. 1 PG&E, SCE, SDG&E also commented in support of this definition. In addition, PG&E, SCE, SDG&E commented that the AMCA
21421 fan definition included an energy output limit of 25 kJ/kg of air which is appropriate to distinguish a fan from a compressor PG&E, SCE, SDG&E, No. 17, at pp. 12. Further, PG&E, SCE, SDG&E noted that the definition for fans in AMCA 21421 includes the option but not the requirement for a motor controller and is not specific to electrically-driven equipment. PG&E, SCE, SDG&E, also noted that the definition does not specify a fan flow angle and includes centrifugal, axial, and mixed-flow blade orientations i.e., what are commonly referred to as blowers. PG&E, SCE, SDG&E, No.
17, at p. 2. AMCA, Greenheck, and ebm-papst supported the definition of fan in AMCA 21421 and further verified that they consider the terms fan and blower to be interchangeable AMCA, No. 12, at p. 3;

ebm-papst, No. 19, at p. 1; Greenheck, No. 18, at p. 1. AMCA also supported DOEs position that the definition of compressor in the compressor regulation sufficed to differentiate fans from compressors. AMCA, No. 12, at p.
3 Ebm-papst stated that limiting the energy output to 25 kJ/kg of air on the fan definition is appropriate to distinguish a fan from a compressor ebm-papst, No. 19, at p. 1. In addition, AMCA commented that fans that use steam, combustion, or drivers other than electric motors suitable to be powered by the electricity grid should be exempted from any future DOE
regulation. AMCA, No. 12, at p. 2
DOE is establishing a definition for fan or blower, which provides the scope of coverage of the final determination, and is identical to the definition of fan in AMCA 21421. DOE has determined that the terms fan and blower are used interchangeably in the U.S. market and therefore applies the same definition to the terms fan and blower also referred to collectively as fan in the remainder of this final determination.
DOE notes that the maximum energy limit of 25 kJ/kg of air is equivalent to a pressure ratio of 1.3.21 The value of 1.3
matches the pressure ratio used in the definition of compressor at 10 CFR
431.342. Based on the comments from interested parties and on the existing DOE definition of compressor, DOE
concludes that the maximum fan energy limit of 25 kJ/kg is appropriate to distinguish fans from compressors and is adopting this upper limit in the definition.
With regard to the criterion that a fan must convert electrical and mechanical power into air power, fans that are powered by an engine or any other driver would meet this criterion as the engine or other driver would be providing mechanical power that is converted into air power. Inclusion of the term mechanical covers fans that are sold without an electric motor or other driver and which convert mechanical power into airpower.
In response to the May 2021 RFI, Ebm-papst agreed that the fan definition in AMCA 21421 is appropriate for the coverage determination and commented that the commercial and industrial fan definition, as based on the AMCA 214
21 fan definition, should include circulating fans that are not ceiling fans as defined at 10 CFR 430.2. ebm-papst,
20 ANSI/AMCA 21421, Test Procedure for Calculating Fan Energy Index FEI for Commercial and Industrial Fans and Blowers. AMCA 214
21

21 For an air density of 1.2 kg/m3, the fan pressure is 1.2 25 kJ/kg, i.e., 30 kPa, and the pressure ratio is calculated as 100 + 30/100 = 1.30 where atmospheric pressure = 100 kPa.

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