Standard Swedish standard · SS-EN ISO 11691:2009

Acoustics - Measurement of insertion loss of ducted silencers without flow - Laboratory survey method (ISO 11691:1995)

Status: Withdrawn

· Replaced by: SS-EN ISO 11691:2020
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Standard Swedish standard · SS-EN ISO 11691:2009

Acoustics - Measurement of insertion loss of ducted silencers without flow - Laboratory survey method (ISO 11691:1995)
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Scope
This International Standard specifies a laboratory substitution method to determine the insertion loss without flow of ducted, mainly absorbent, circular and rectangular silencers, as well as other duct elements for use in ventilating and air-conditioning systems. NOTE 1 Laboratory measurement procedures for ducted silencers with superimposed flow are described in ISO 7235.This International Standard is applicable to silencers where the design velocity does not exceed 15 m/s. As the method does not include self-generated flow noise, this International Standard is not suitable for tests on silencers where this type of noise is of great importance for the evaluation of the silencer performance.The insertion loss determined according to this International Standard in a laboratory will not necessarily be the same as the insertion loss that will be obtained in an installation in the field. Different sound and flow fields in the duct will yield different results. As this International Standard requires regular test ducts, the results may include some flanking transmission via structural vibrations in the duct walls, that sets an upper limit to the insertion loss that can be determined.NOTE 2 ISO 7235 gives methods for determining this limit.This International Standard is intended to be used for circular silencers with diameters of 80 mm to 2000 mm or rectangular silencers with crossectional areas within the same range.

Subjects

Acoustics (14.020) Acoustics in building, sound insulation (91.120.20) Ventilation and air-conditioning systems (91.140.30)


Buy this standard

Standard Swedish standard · SS-EN ISO 11691:2009

Acoustics - Measurement of insertion loss of ducted silencers without flow - Laboratory survey method (ISO 11691:1995)
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Price: 875 SEK
standard ikon pdf

PDF

Price: 875 SEK
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Price: 1 400 SEK
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Product information

Language: English

Written by: Svenska institutet för standarder

International title:

Article no: STD-70657

Edition: 2

Approved: 8/31/2009

No of pages: 24

Replaces: SS-EN ISO 11691

Replaced by: SS-EN ISO 11691:2020