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The Q-Tech high performance SONEX circular attenuators are the outcome of a testing and development programme in our insertion loss test facility.
Developed to provide high performances the SONEX range is designed for a number of applications. Their prime use is for connecting to fans, but they are also ideal for connecting to supply air grilles or being positioned anywhere throughout a system where attenuation is necessary to remove noise generated by equipment.
In all situations they provide a known and dependable insertion loss, giving security to design engineers looking for quality installations in often difficult to handle situations.
All units have been tested in accordance with BS4718:1971 for insertion loss. Air flow pressure loss data was obtained from tests conducted on a BS848:Part 1, 1980 test rig.
Pressure losses are little more than those which would occur over a comparable section of straight duct.
The attenuator consists of a perforated tubular liner manufactured from sheet steel. The liner is enclosed by a thick layer of mineral wool sound absorbing material. Casing and end plates are formed from galvanised sheet steel.


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