ILO Home
Go to the home page
Site map | Contact us Franšais | Espa˝ol

CISDOC database

Document ID (ISN)27920
CIS number 77-1573
ISSN - Serial title Noise Control
Year 1977
Convention or series no.
Author(s) Finkelstein W.
Title Ideal attenuation characteristics of sound attenuators for ventilation and air conditioning plants.
Bibliographic information Mar. 1977. Vol.8, No.3, p.93-97. Illus.
Abstract Investigation to develop an attenuator with a performance optimised to match the frequency-related variation of noise reduction required by ventilation and air-conditioning systems. Aspects studied are: noise sources (fans, ducts, terminal box, etc.); system attenuation; weighting system; acoustic frequency analysis of installed systems (low-and high pressure installations, duct in room without an air outlet); calculations from other literature sources. Conclusions: the 250Hz octave band is a critical frequency for the required insertion losses; only slightly higher, or in most cases even smaller, attenuation values are required in frequency bands above and below 250Hz; with conventional absorption silencers, selection depends on the insertion loss at or near the 250Hz octave band.
Descriptors (primary) airflow noise; ventilation systems; silencers; fans
Descriptors (secondary) acoustics; sound spectrum analysis; mathematical analysis; sound attenuation
Document type -
Subject(s) Noise, hearing and vibration
Broad subject area(s)
Browse category(ies) Ventilation
Compressed gases and pressure vessels