SNV NF EN 25136 : 1994
Withdrawn
A Withdrawn Standard is one, which is removed from sale, and its unique number can no longer be used. The Standard can be withdrawn and not replaced, or it can be withdrawn and replaced by a Standard with a different number.
23-07-2013
12-01-2013
Specifies a method for the determination of the acoustic power radiated into a duct by fans and other aerodynamic sound sources (flaps, throttles, boxes). The source under test shall produce a stationary sound. Test duct diameters may range from 0,15 m to 2 m. Measurements can be carried out with air temperatures between -50 degree C and +70 degree C provided that the flow velocity does not exceed 30 m/s, and the maximum swirl angle is 15 degree.
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