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About This Item

 

Full Description

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.
 

Document History

  1. BS EN ISO 7235:2009


    Acoustics. Laboratory measurement procedures for ducted silencers and air-terminal units. Insertion loss, flow noise and total pressure loss

    • Most Recent
  2. BS EN ISO 7235:2003


    Acoustics. Laboratory measurement procedures for ducted silencers and air-terminal units. Insertion loss, flow noise and total pressure loss

    • Historical Version
  3. BS EN ISO 7235:1996


    Acoustics. Measurement procedures for ducted silencers. Insertion loss, flow noise and total pressure loss

    • Historical Version
  4. BS 4718:1971

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    Methods of test for silencers for air distribution systems

    • Historical Version