It depends on sound absorbing material to dissipate the acoustical energy and are usually straight thru designs. All Blow off Silencers in Sharjah  should be coupled as close as possible to the compressor to prevent excessive pipe radiated noise. The centrifugal Blow off Silencers in Sharjah  are normally selected on the basis of maximum allowable pressure drop at rated flow and the silencing criteria. These silencers are usually sized for around 5000 to 5500 FPM velocity but not exceeding 7500 FPM velocity to prevent excessive self-generated noise and aerodynamic noise generation. While selecting the centrifugal Blow off Silencers in Sharjah, it must be ensured that the flow area throughout the silencer is sufficient to accommodate the air flow without imposing excessive restriction. The following table indicates the maximum recommended air flow in CFM for respective Blow off Silencers in Sharjah  size in accordance with the above guidelines.