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Federal Register / Vol. 86, No. 232 / Tuesday, December 7, 2021 / Proposed Rules
1.
1.4. Blade span means the diameter of the largest circle swept by any part of the fan blade assembly, including attachments. The represented value of blade span D is as determined in 10 CFR 429.32.

1.8. High-speed small-diameter HSSD
ceiling fan means a small-diameter ceiling fan that is not a very-small-diameter ceiling fan, highly-decorative ceiling fan or beltdriven ceiling fan and that has a represented value of blade edge thickness, as determined in 10 CFR 429.32a3iii, of less than 3.2

mm or a maximum represented value of tip speed, as determined in 10 CFR
429.32a3v, greater than the applicable limit specified in the table in this definition.

HIGH-SPEED SMALL-DIAMETER CEILING FAN BLADE AND TIP SPEED CRITERIA
Thickness t of edges of blades
Tip speed threshold
Airflow direction Mm Downward-only
Downward-only
Reversible
Reversible

1.9. High-speed belt-driven HSBD ceiling fan means a small-diameter ceiling fan that is a belt-driven ceiling fan with one fan head, and has tip speeds greater than or equal to 5000 feet per minute.
1.10. Highly-decorative ceiling fan means a ceiling fan with a maximum represented value of blade revolutions per minute RPM, as determined in 10 CFR 429.32a3ii, of 90 RPM, and a represented value of airflow at high speed, as determined in 10 CFR
429.32a3vi, of less than 1,840 CFM.
1.11. Hugger ceiling fan means a low-speed small-diameter ceiling fan that is not a verysmall-diameter ceiling fan, highly-decorative ceiling fan, or belt-driven ceiling fan, and for
4.8 > t t 4.8 > t t
Inch

3.2
4.8
3.2
4.8

which the represented value of the distance between the ceiling and the lowest point on the fan blades, as determined in 10 CFR
429.32a3iv, is less than or equal to 10
inches.
1.12. Large-diameter ceiling fan means a ceiling fan that is not a highly-decorative ceiling fan or belt-driven ceiling fan and has a represented value of blade span, as determined in 10 CFR 429.32a3i, greater than seven feet.
1.13. Large-diameter belt-driven LDBD
ceiling fan means a belt-driven ceiling fan with one fan head that has a represented value of blade span, as determined in 10 CFR
429.32a3i, greater than seven feet.

3 16

3 16

feet per minute
m/s
> t 18
t 316
> t 18
t 316

16.3
20.3
12.2
16.3

3,200
4,000
2,400
3,200

1.14. Low speed means the lowest available ceiling fan speed for which fewer than half or three, whichever is fewer, sensors per individual axis are measuring less than 40
feet per minute.
1.15. Low-speed small-diameter LSSD
ceiling fan means a small-diameter ceiling fan that has a represented value of blade edge thickness, as determined in 10 CFR
429.32a3iii, greater than or equal to 3.2
mm and a maximum represented value of tip speed, as determined in 10 CFR
429.32a3v, less than or equal to the applicable limit specified in the table in this definition.

LOW-SPEED SMALL-DIAMETER CEILING FAN BLADE AND TIP SPEED CRITERIA
Thickness t of edges of blades
Tip speed threshold
Airflow direction Mm
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Reversible
Reversible

1.16. Multi-head ceiling fan means a ceiling fan with more than one fan head, i.e., more than one set of rotating fan blades.
1.17. Multi-mount ceiling fan means a lowspeed small-diameter ceiling fan that can be mounted in the configurations associated with both the standard and hugger ceiling fans.
1.18. Oscillating ceiling fan means a ceiling fan containing one or more fan heads for which the axis of rotation of the fan blades cannot remain in a fixed position relative to the ceiling. Such fans have no inherent means by which to disable the oscillating function separate from the fan blade rotation.
1.19. Small-diameter ceiling fan means a ceiling fan that has a represented value of blade span, as determined in 10 CFR
429.32a3i, less than or equal to seven feet.
1.20. Standard ceiling fan means a lowspeed small-diameter ceiling fan that is not a very-small-diameter ceiling fan, highlydecorative ceiling fan or belt-driven ceiling fan, and for which the represented value of the distance between the ceiling and the
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Inch
4.8 > t 3.2
t 4.8

lowest point on the fan blades, as determined in 10 CFR 429.32a3iv, is greater than 10
inches.
1.21. Total airflow means the sum of the product of airflow and hours of operation at all tested speeds. For multi-head fans, this includes the airflow from all fan heads.
1.22. Very-small-diameter VSD ceiling fan means a small-diameter ceiling fan that is not a highly-decorative ceiling fan or beltdriven ceiling fan; and has one or more fan heads, each of which has a represented value of blade span, as determined in 10 CFR
429.32a3i, of 18 inches or less. Only VSD
fans that also meet the definition of an LSSD
fan are required to be tested for purposes of determining compliance with energy efficiency standards established by DOE and for other representations of energy efficiency.
2. Scope:
The provisions in this appendix apply to ceiling fans except:
1 Ceiling fans where the plane of rotation of a ceiling fans blades is not less than or equal to 45 degrees from horizontal, or cannot be adjusted based on the
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3 16

feet per minute
m/s
> t 18
t 316

12.2
16.3

2,400
3,200

manufacturers specifications to be less than or equal to 45 degrees from horizontal;
2 Centrifugal ceiling fans;
3 Belt-driven ceiling fans that are not either a high-speed belt-driven ceiling fan or a large-diameter belt-driven ceiling fan; and 4 Oscillating ceiling fans.
3. General Instructions, Test Apparatus, and Test Measurement:
The test apparatus and test measurement used to determine energy performance depend on the ceiling fans blade span, and in some cases the ceiling fans blade edge thickness. For each tested ceiling fan, measure the lateral distance from the center of the axis of rotation of the fan blades to the furthest fan blade edge from the center of the axis of rotation. Measure this lateral distance at the resolution of the measurement instrument, using an instrument with a measurement resolution of least 0.25 inches.
Multiply the lateral distance by two and then round to the nearest whole inch to determine the blade span. For ceiling fans having a blade span greater than 18 inches and less than or equal to 84 inches, measure the
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