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Federal Register / Vol. 86, No. 232 / Tuesday, December 7, 2021 / Proposed Rules
Effective Area sq.ft.
2 For the sensors between sensor 1 and the last sensor used in the measurement, the effective area has a width of 4 inches. If a
= 11: 122 2 = 0. 0873

Effective Area sq.ft.

Eq.1

sensor is a distance d, in inches, from sensor 1, then the effective area is:

Effective Area sq.ft.=
3 For the last sensor, the width of the effective area depends on the horizontal displacement between the last sensor and the point on the ceiling fan blades furthest radially from the center of the fan. The total area included in an airflow calculation is the area of a circle 8 inches larger in diameter
69573

11:

2
d+2 2- d-2
12
12

than the ceiling fan blade span as specified in section 3 of this appendix.
Therefore, for example, for a 42-inch ceiling fan, the last sensor is 3 inches beyond the end of the ceiling fan blades. Because only the area within 4 inches of the end of the ceiling fan blades is included in the
d+1 2= 1l 12

1l
d+3 2= 1l 12

1l
Eq. 2

11:

airflow calculation, the effective width of the circle corresponding to the last sensor would be 3 inches. The calculation for the effective area corresponding to the last sensor would then be:

2 12 2- 24-2
2 d-2
12 = 24+1
12 = 3. 076

Eq. 3

2 12 2- 24-2
2 d-2
12 = 24+3
12 = 5.345

Eq. 4

1l
1l
For a 46-inch ceiling fan, the effective area of the last sensor would have a width of 5
inches, and the effective area would be:

appendix, and then sum the products to obtain the overall calculated airflow at the tested speed.
For each speed, using the overall calculated airflow and the overall average power consumption measurements from the successive sets of measurements as follows:

= wsbXOHsb f.iCFM;xOH;
+ f.;W;XOH;

TABLE 2 TO APPENDIX U TO SUBPART B OF PART 430: DAILY OPERATING HOURS FOR CALCULATING CEILING FAN
EFFICIENCY
No Standby
With standby
lotter on DSK11XQN23PROD with PROPOSALS4

Daily Operating Hours for LSSD and VSD Ceiling Fans High Speed
Low Speed
Standby Mode
Off Mode
Daily Operating Hours for HSSD Ceiling Fans
3.4
3.0
0.0
17.6

3.4
3.0
17.6
0.0

High Speed
Standby Mode
Off Mode

12.0
0.0
12.0

12.0
12.0
0.0

These values apply only to VSD fans that also meet the definition of an LSSD fan.

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corresponds to the ceiling fan mounted in the configuration associated with the definition of a hugger ceiling fan, and the other efficiency corresponds to the ceiling fan mounted in the configuration associated with the definition of a standard ceiling fan.

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OHSb = operating hours in standby mode, as specified in Table 2 of this appendix, and WSb = power consumption in standby mode.
Calculate two ceiling fan efficiencies for multi-mount ceiling fans: One efficiency
Eq. 5

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LSSD, and VSD ceiling fans, multiply the overall average air velocity at each sensor position from section 3.3 for high speed for HSSD, LSSD, and VSD ceiling fans that also meet the definition of an LSSD ceiling fan;
and repeated for low speed only for LSSD
and VSD ceiling fans that also meet the definition of an LSSD ceiling fan by that sensors effective area see section 4.1 of this
Ceiling Fan Efficiency CFM/W

Where:
CFMi = airflow at speed i, OHi = operating hours at speed i, as specified in Table 2 of this appendix, Wi = power consumption at speed i,
1l
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4.2 Calculation of airflow and efficiency for small-diameter ceiling fans other than high-speed belt-driven ceiling fans:
Calculate fan airflow using the overall average of both sets of air velocity measurements at each sensor position from the successive sets of measurements that meet the stability criteria from section 3.3 of this appendix. To calculate airflow for HSSD,
1l
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EffectiveAreasq.ft.