CFEI
(6) (A) Notwithstanding any other provision of this chapter, the Secretary may consider, and issue, if the requirements of subsections (o) and (p) are met, energy efficiency or energy use standards for electricity used by ceiling fans to circulate air in a room. (B) In issuing the standards under subparagraph (A), the Secretary shall consider— (i) exempting, or setting different standards for, certain product classes for which the primary standards are not technically feasible or economically justified; and (ii) establishing separate exempted product classes for highly decorative fans for which air movement performance is a secondary design feature. (C) (i) Large-diameter ceiling fans manufactured on or after January 21, 2020 , shall— (I) not be required to meet minimum ceiling fan efficiency in terms of ratio of the total airflow to the total power consumption as described in the final rule titled “Energy Conservation Program: Energy Conservation Standards for Ceiling Fans” ( 82 Fed. Reg. 6826 ( January 19, 2017 )); and (II) have a CFEI greater than or equal to— (aa) 1.00 at high speed; and (bb) 1.31 at 40 percent speed or the nearest speed that is not less than 40 percent speed. (ii) For purposes of this subparagraph, the term “CFEI” means the Fan Energy Index for large-diameter ceiling fans, calculated in accordance with ANSI/AMCA Standard 208–18 titled “Calculation of the Fan Energy Index”, with the following modifications: (I) Using an Airflow Constant (Q 0 ) of 26,500 cubic feet per minute. (II) Using a Pressure Constant (P 0 ) of 0.0027 inches water gauge. (III) Using a Fan Efficiency Constant (η 0 ) of 42 percent.