BS 4718:1971被替代
Methods of test for silencers for air distribution systems
出版：British Standards Institution
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基本信息
标准编号： BS 4718:1971
发布时间：1971/4/22 0:00:00
标准类别：Standard
出版单位：British Standards Institution
标准页数：36
标准简介
Measurement of performance of unit silencers and silencing elements for ducted ventilating and air conditioning systems; aspects considered are attenuation of broad band airborne sound (insertion loss), generation of aerodynamic noise (generated noise level) by, and change in pressure in, air flowing through silencer. Methods measure insertion loss without airflow. Does not apply to silencers providing selective attenuation over narrow frequency bands, or to silencers designed for direct coupling to a fan or for sound insulation of partitions with ventilated openings.
标准备注
© British Standards Institution 2013
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