British & International Standards
BS 4718 : Methods of Test for Silencers
Air Distribution Systems
Standard Number BS 4718:1971
Title Methods of test for silencers for air distribution systems
Abstract 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.
Status Superseded, Withdrawn
Publication Date 22 April 1971
Withdrawn Date 08 September 2003
Cross References BS 848:Part 1, BS 848:Part 2, BS 1042, BS 2475, BS 2750, BS 3638, BS 4196, BS 4197
Replaced By BS EN ISO 7235:2003
Supersedes Draft 69/27265 DC
Descriptors Air-distribution systems, Air-conditioning equipment, Silencers, Ventilation equipment, Performance, Performance testing, Noise control devices, Noise control (acoustic), Acoustic measurement, Acoustic testing, Pressure measurement (fluids), Test equipment, Extrapolation, Noise (environmental)
ICS 91.140.30
Sound Level Measurements
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