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Federal Register / Vol. 86, No. 158 / Thursday, August 19, 2021 / Rules and Regulations
FR 37678, 37679. Specifically, DOE
proposed the following definitions:

following definitions for fan and blower:

A fan is an electrically powered device used in commercial or industrial systems to provide a continuous flow of a gas, typically air, for ventilation, circulation, or other industrial process requirements. Fans are classified as axial or centrifugal. Axial fans move an airstream along the axis of the fan.
Centrifugal fans generate airflow by accelerating the airstream radially. A fan may include some or all of the following components: motor and motor controls, rotor or fan blades, and transmission and housing.
A blower is a type of centrifugal fan.

Commercial/Industrial Fan: A device used in commercial or industrial systems to provide a continuous flow of a gas, typically air, by an impeller fit to a shaft and bearings. A fan may be manufactured with or without a housing component.
Blower: An axial or centrifugal fan with a specific ratio between 1.11 and 1.20.

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In response to the June 2011 NOPD, the CA IOUs encouraged DOE to consult test procedures of AMCA, American Society of Heating, Refrigeration and Air-Conditioning Engineers ASHRAE, and National Fire Protection Association, as well as any other test procedures that may be relevant to this rulemaking. They also encouraged DOE to develop a more robust definition for blowers suggesting that fans and blowers are differentiated by the method used to move the air and by the system pressure they must operate against. The CA IOUs recommended DOE rely on specific ratios of the discharge pressure over the suction pressure, to define fans and blowers. The CA IOUs also urged DOE
to ensure that the definitions for fans do not overlap with residential air handlers or commercial packaged air conditioning units. CA IOUs, No. 6, at pp. 35.
In response to the June 2011 NOPD, NEEA asked whether the proposed definition of fan included mixed flow fans which have aspects of both an axial and centrifugal fan, citing a tubular centrifugal fan as an example of this type of fan. NEEA also asked whether the proposed definition of blower would include mixed flow blowers that have aspects of both an axial and centrifugal fan and are frequently used for laboratory exhaust applications.
NEEA, No. 5, at p. 12. The Efficiency advocates encouraged DOE to cover mixed flow fans Efficiency advocates, No. 4, at p. 3.
In response to the June 2011 NOPD, AMCA commented generally that the proposed definitions of fans and blowers were not consistent with the established fan industry definitions and recommended that DOE adopt the relevant industry standards AMCA, No.
7, at p. 3.
Taking into consideration the comments received to the June 2011
NOPD, in the January 2013 Framework Document, DOE considered the
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January 2013 Framework Document at pp. 7 and 9
DOE also acknowledged that the terms fan and blower are used interchangeably by the industry.
January 2013 Framework Document at p. 9
In response to the January 2013
Framework Document, the CA IOUs commented that AMCA 9910, Standards Handbook 12 included a fan definition and that the American Society of Mechanical Engineers ASME relied on specific ratios of the total pressure at the outlet of the equipment over the total inlet pressure to distinguish between fans, blowers, and compressors. The CA IOUs commented that DOE should ensure the definitions for fans, blowers, and compressors 13 are aligned to prevent any loopholes. Docket No. EERE2013
BTSTD0006; CA IOUs, No. 11, at p.
3 Morrison Products commented that while the industry used the terms fan and blower interchangeably, they recommend using the ASME
terminology. Docket No. EERE2013
BTSTD0006; Morrison Products, No.
15, at p. 5 AMCA commented that the terms fan and blower were used interchangeably and suggested a definition for the term fan.14 Docket 12 ANSI/AMCA Standard 9910: Standards Handbook. Available at www.amca.org.
13 Fans and compressors are equipment used to move amounts of gas generally air. A fan moves gas with a low increase in pressure while a compressor moves gas with a high increase in pressure. DOE established a definition of compressor as follows: A machine or apparatus that converts different types of energy into the potential energy of gas pressure for displacement and compression of gaseous media to any higher pressure values above atmospheric pressure and has a pressure ratio at full-load operating pressure greater than 1.3. See 10 CFR 431.342.
14 AMCA recommended defining fan as a rotary bladed machine designed to convert mechanical power to air power in order to maintain continuous flow from the inlets to outlets. Energy output is limited to 25 kJ/kg of air. A fan contains the following basic components: a Impellers: Rotary bladed aerodynamic component responsible for the total energy increase of the airstream delivered by the fan; b Fan Structure: Any integral components necessary to support the impeller, alters the energy-composition of the airstream, or directs flow into or out of the impeller. These components must be present when testing to develop performance ratings of the fan; c Inlet:
Surfaces bounded by a portion of the fan structure across which air enters the fan; d Outlet:

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No. EERE2013BTSTD0006; AMCA, No. 19, at pp. 4, 43 The American Council for an Energy-Efficient Economy and other efficiency organizations 15 ACEEE, et al.
commented in support of establishing a broad definition for fans and then specify which fans should be excluded from coverage, as this approach is more administrable and less subject to unintended loopholes. ACEE, et al. also commented that the a distinction between fans, blowers, and compressors has not been established. Docket No.
EERE2013BTSTD0006; ACEEE, et al.; No. 25, at p. 3 In response to the January 2013 Framework Document, ebm-papst commented that the terms commercial and industrial would require further clarification and that a fan definition should rely on physical features e.g., size, performance, construction. Ebm-papst noted that in Europe, an impeller fitted to a shaft and bearing is not considered a fan.
Rather the entity that combines the impeller with an electric motor is considered the fan manufacturer.
Docket No. EERE2013BTSTD0006;
emb-papst, No. 20, at p. 6 Emb-papst added a fan description from the European Ventilation Industry Association which describes a fans as:
A fan is a combination of an impellers and motor. It may also include a housing, mechanical drive and a variable speed drive. Docket No.
EERE2013BTSTD0006; emb-papst, No. 20, at p. 8
Consistent with DOEs acknowledgement, the Working Group commented that the terms fan and blower are used interchangeably in the U.S. market and suggested eliminating the term blower to avoid potential confusion. Docket No. EERE
2013BTSTD0006; Public Meeting Presentation, No. 106, at p. 47 To the extent that a blower would meet the criteria in the proposed definition, it is a fan. As such, DOE is not considering further a separate definition for blower.
DOE reviewed existing industry standards to compare how industry standards define the terms fan and blower and distinguish this equipment from compressors. AMCA 9910 16
includes an energy limit of 25 kilojoule Surfaces bounded by a portion of the fan structure from which air exits the fan. Docket No. EERE
2013BTSTD0006; AMCA, No. 19, at p. 43
15 Appliance Standards Awareness Project, Northwest Energy Efficiency Alliance, Natural Resources Defense Council, and Alliance to Save Energy.
16 ANSI/AMCA Standard 9910: Standards Handbook. Available at www.amca.org.

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