DS DS/EN 25136
DS DSEN 25136 1994-JAN-27 Acoustcs - Determnaton of sound power radated nto a duct by fans - n-duct method
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This standard specifies a method for testing ducted fans to determine the sound power radiated into an anechoically-terminated duct on the inlet and/or outlet side of of the equipment. The method applies to a sound source in which a fan is usually connected to ducts on at least one side.