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  • BS 4718:1971

BS 4718:1971

Methods of test for silencers for air distribution systems

BSI Group, 04/22/1971

Publisher: BS

File Format: PDF

$125.00$251.46


Published:22/04/1971

Pages:30

File Size:1 file , 840 KB

Note:This product is unavailable in Ukraine, Russia, Belarus

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.

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