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Federal Register / Vol. 86, No. 232 / Tuesday, December 7, 2021 / Proposed Rules
AxisD

AxisC

Axis A

AxisB
Test area
Figure 2 to Appendix U to Subpart B of Part 430: Testing Room and Sensor Arm Axes

four axes intersect, aligning the sensors perpendicular to the direction of airflow. Do not touch the actual sensor prior to testing.
Use enough sensors to record air delivery

6 Place the sensors at intervals of 4
0.0625 inches along a sensor arm, starting with the first sensor at the point where the
within a circle 8 inches larger in diameter than the blade span of the ceiling fan being tested. The experimental set-up is shown in Figure 3 of this appendix.

Ceiling Level
Lowest point on the blades Ceilin Fan
Unused sensors
43"

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BILLING CODE 645001C

3.2.3. Multi-Head Ceiling Fan Test Set-Up.
Hang a multi-headed ceiling fan from the ceiling such that one of the ceiling fan heads is centered directly over sensor 1 i.e., at the
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intersection of axes A, B, C, and D. The distance between the lowest point any of the fan blades of the centered fan head can reach and the air velocity sensors is to be such that it is the same as for all other small-diameter ceiling fans see Figure 3 of this appendix.

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If the multi-head ceiling fan has an oscillating function i.e., the fan heads change their axis of rotation relative to the ceiling that can be switched off, switch it off prior to taking air velocity measurements. If any multi-head fan does not come with the
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Figure 3 to Appendix U to Subpart B of Part 430: Air Delivery Room Set-Up for Small-Diameter Ceiling Fans other than High-Speed Belt-Driven Ceiling Fans
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Sensor