BS EN IEC 60704-2-7:2020 pdf free.Household and similar electrical appliances一Test code for the determination of airborne acoustical noise.Particular requirements for fans.
BS EN IEC 60704-2-7 This document applies to electrical fans (including their accessories and their component parts) for household and similar use, designed for AC or DC supply. The motor, the impeller and their housing, if any, form a single unit. These particular requirements apply to: 一conventional fans, 一table fans, 一pedestal fans, 一ceiling fans, 一bladeless fans, 一wall bracket fans, 一ceiling bracket fans, 一louver fans, 一tower fans, 一ventilating and partition ventilating fans. This standard does not apply to: 一fans that are part of a ventilation system, 一fans designed exclusively for industrial purposes, 一fans that are part of an appliance (for example cooling fans), 一fans with additional functions (for example heating, humidifying). Limitations for the use of this test code are given in the scope of IEC 60704-1.This document describes the determination of the noise emission of household fans in normal operation at maximum speed. Other speeds can, in addition, be used. Requirements for the declaration of noise emission values are not within the scope of this document. The aim of this document is to give direction for measuring the noise in a room resulting from the operation of a fan.Load and operation should simulate normal use. Fans that can be tilted during normal use shall be located in the position with the highest emitted noise level, and the duration of the measurement shall be at least 10 s. Fans that can oscillate automatically shall operate when oscillating. In the case of oscillating appliances, the A-weighted sound pressure level shall be averaged on at least one complete cycle.Ceiling fans may be hung from a special support instead of from the ceiling. In this case, care shall be taken to ensure that the means of suspension or clamping do not change the sound output of the appliance. In order not to restrict the airflow, the distance between the lowest edge of the appliance and the reflecting plane (usually the floor) shall be at least 1,5 m. Alternatively, ceiling fans can be mounted in the reverse working position on the reflecting plane, providing this does not affect sound radiation. BS EN IEC 60704-2-7 pdf download.