Mechanical Supplies
Vane axial fan silencer
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- Pod silencers matched to the casing diameter of a vane axial fan, mounted directly on the inlet or discharge flange. The centre pod aligns with the fan hub so the airway area, and therefore the fan curve, is preserved.
Application
Used on car park ventilation, tunnel and stairwell pressurisation fans, and on axial fans discharging through a façade near residential neighbours. Because attenuation is needed most at blade passing frequency, the silencer is selected against the fan's own sound power spectrum rather than a generic dB(A) target.
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.
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.
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.
Also citedAMCA 260
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