Mechanical Supplies
Circular attenuator (tubular silencers)
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- Circular silencers built as an absorptive annulus, with or without a centre pod, matched to spiral duct diameters. The pod version raises low-frequency attenuation at the cost of extra pressure drop.
Application
Used on spiral duct systems in exposed-services interiors, on inline fan discharges, and on toilet and kitchen extract risers where a rectangular unit would not suit the round duct run. Because they fit inline without a transition, they avoid the turbulence and regenerated noise that a rectangular silencer with two transformation pieces introduces.
Standards & Reference 5 cited
ASTM E477 (Intertek tested)
Acoustical and airflow performance of duct silencers, independently tested by Intertek. The method behind an attenuator's insertion loss and self-noise data.
AMCA 300
The reverberant room method for measuring the sound a fan emits. The source of the sound power figures used in an acoustic calculation.
UL 181
Factory-made air ducts and air connectors: the listing a flexible or fabricated duct carries.
ASTM E84
Surface burning characteristics: the flame spread index and smoke developed index a material is classified by. Class A is the usual requirement in an occupied building.
EN ISO 7235
Measurement procedures for ducted silencers: insertion loss, flow noise and pressure drop. These are the three numbers an attenuator is selected on.
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