BS EN IEC 60704-2-7:2020 pdf download – Household and similar electrical appliances — Test code for the determination of airborne acoustical noise Part 2-7: Particular requirements for fans.
3 Terms and definitions This clause of Part 1 is applicable except as follows: Addition: 3.1 01 conventional fan comfort fan with a propeller having two or more blades, with free inlet and outlet of air [SOURCE: IEC 60879:201 9, 3.2] 3.1 02 tower fan comfort fan for use directly on the floor having a vertically elongated design of the cross flow type, tangential type or centrifugal type or impeller type with a free inlet and outlet of air [SOURCE: IEC 60879:201 9, 3.3] 3.1 03 bladeless fan comfort fan of any type that is not fitted with a propeller [SOURCE: IEC 60879:201 9, 3.4] 3.1 04 ceiling fan conventional fan provided with a device for suspension from the ceiling of a room so that the blades rotate in a horizontal plane with the diameter of the blade not larger than 1 800 mm [SOURCE: IEC 60879:201 9, 3.5] 3.1 05 table fan comfort fan intended for use on a table Note 1 to entry: Table fans have a maximum adjustable or non-adjustable height not greater than 1 200mm Note 2 to entry: Adjustment of height, position and oscillation can be possible. Note 3 to entry: It can be a table fan or bracket-mounted fan for wall or ceiling mounting. [SOURCE: IEC 60879:201 9, 3.6, modified − Note 2 to entry and Note 3 to entry added]
3.1 06 pedestal fan comfort fan mounted on a pedestal of fixed or variable height Note 1 to entry: Pedestal fans have a maximum adjustable height or non-adjustable height greater than 1  200 mm Note 2 to entry: Adjustment of position and oscillation can be possible. [SOURCE: IEC 60879:201 9, 3.7, modified – Note 2 to entry added] 3.1 07 wall bracket fan comfort fan for mounting on the wall [SOURCE: IEC 60879:201 9, 3.8] 3.1 08 ceiling bracket fan comfort fan for mounting on the ceiling [SOURCE: IEC 60879:201 9, 3.9] 3.1 09 louvre fan comfort fan having a moving louvre which provides a continuously changing multi-directional air flow [SOURCE: IEC 60879:201 9, 3.1 0] 3.1 10 ventilating fan fan intended to displace air either from one side of a partition to the other, or within a duct installed either on the fan inlet or on the fan outlet or both [SOURCE: IEC 60665:201 8, 3.2] 3.1 1 1 partition ventilating fan type A ventilating fan ventilating fan installed in or upon the aperture of a partition in order to displace air from one side of the partition to the other side, both the sides being free spaces [SOURCE: IEC 60665:201 8, 3.3] 3.1 12 free inlet partition ventilating fan type B ventilating fan ventilating fan with a direct inlet from free space and with ducted outlet [SOURCE: IEC 60665:201 8, 3.4] 3.1 13 free outlet partition ventilating fan type C ventilating fan ventilating fan with ducted inlet, and with direct outlet to free space [SOURCE: IEC 60665:201 8, 3.5]
4 Measurement methods and acoustical environments This clause of Part 1 is applicable except as follows: 4.2 Direct method Addition: If pure tone components are present in the noise emitted by the source, the estimated standard deviation of the measured sound pressure levels in the special reverberation room can increase. In such cases, additional microphone positions or source positions can be necessary, such as those specified in ISO 3743-2. 4.3 Comparison method Addition: If pure tone components are present in the noise emitted by the source, the estimated standard deviation of the measured sound pressure levels in the hard-walled test room or in the special reverberation room can increase. In such cases, additional microphone positions or source positions can be necessary, such as those specified in ISO 3743-1 or ISO 3743-2. 5 Instrumentation This clause of Part 1 is applicable except as follows: Addition: The use of a windscreen is mandatory, and necessary corrections for changes in the microphone sensitivity shall be added to the observed sound pressure levels.