Federal Register - December 7, 2021
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Source: Federal Register
Federal Register / Vol. 86, No. 232 / Tuesday, December 7, 2021 / Proposed Rules ceiling fans blade edge thickness. To measure the fan blade edge thickness, use an instrument with a measurement resolution of at least 0.001 inch and measure the thickness of one fan blades leading edge in the forward direction according to the following:
1 Locate the cross section perpendicular to the fan blades radial length that is at least one inch from the tip of the fan blade and for which the blade is thinnest, and 2 Measure at the thickest point of that cross section within one inch from the leading edge of the fan blade.
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See Figure 1 of this appendix for an instructional schematic on the fan blade edge thickness measurement. Figure 1 depicts a ceiling fan from above. Round the measured blade edge thickness to the nearest 0.01 inch.
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1 Cross section where the blade is thinnest
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Leading edge in forward direction
2 Measure at thickest point in cross section within 111 from leading edge
Figure 1 to Appendix U to Subpart B of Part 430: Measurement Criteria for Fan Blade Edge Thickness
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3.2.2. Equipment Set-up.
1 Make sure the transformer power is off.
Hang the ceiling fan to be tested directly from the ceiling, according to the manufacturers installation instructions. Hang all non-multimount ceiling fans in the fan configuration that minimizes the distance between the ceiling and the lowest point of the fan blades.
Hang and test multi-mount fans in two configurations: The configuration associated
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the definition of a standard fan that minimizes the distance between the ceiling and the lowest point of the fan blades and the configuration associated with the definition of a hugger fan that minimizes the distance between the ceiling and the lowest point of the fan blades. For all tested configurations, measure the distance between the ceiling and the lowest point of the fan blade using an instrument with a measurement resolution of at least 0.25 inches. Round the measured
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distance from the ceiling to the lowest point of the fan blade to the nearest quarter inch.
4 A single rotating sensor arm, two rotating sensor arms, or four fixed sensor arms can be used to take air velocity measurements along four axes, labeled AD.
Axes A, B, C, and D are at 0, 90, 180, and 270 degree positions. Axes AD must be perpendicular to the four walls of the room.
See Figure 2 of this appendix.
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