DIN 45635-56:1986
机器排放的噪声测量.空气传播的噪声.第56部分:包洛面法和通道法.风扇辅助热风发生器、风扇辅助空气加热器和气动装置风扇部件
Measurement of noise emitted by machines; airborne noise emission; enveloping surface method and in-duct method; fan-assisted warm air generators, fan-assisted air heaters and fan units of air handling devices
