Centrifugal Fan Silencer

A centrifugal fan running at full load regularly produces sound power of 85~105 dB(A) at the inlet and outlet. In factories where OSHA has set a maximum continuous limit of 90 dB(A) or where site conditions require lower levels, noise must be controlled at the point of connection to the ductwork before it spreads throughout the system. Centrifugal Fan Silencers are installed directly at the fan inlet, fan outlet or both, which block airborne noise at the source. It uses fibrous absorptive packing material like mineral wool or fiberglass inside a solid steel structure to easily convert sound energy into heat energy.

The type and size of the silencer are always dictated by the particular application. Rectangular parallel-baffle silencers are suited for large rectangular duct outlets and can be arrayed in several rows for tough acoustic targets. Circular tubular silencers having a direct connection to round duct connectors with little pressure loss. Best mid-frequency noise reduction at modest pressure drops in the intake and discharge lines of centrifugal fans is achieved by the combination of reactive and absorptive silencers. The Centrifugal Fan Silencer is supplied in carbon steel as standard with the option of SS304 and SS316L for corrosive or humid conditions. The maximum face velocity is limited to 20~40 m/s to prevent the spontaneous creation of noise inside the silencer. The airflow rate, the desired insertion loss and the maximum permitted pressure drop are needed in order to properly size the fans. Send us your fan model and application details.