Fan silencers

Primary air fans, force draft fans and induced draft fans generally require some fore of acoustical treatment. Most applications require inlet and/or outlet silencers to meet OSHA and other noise requirements. For continuous exposure, a maximum of 90 dBA is generally specified to avoid hearing damage. When conversation near the fan is desired, levels of 80 dBA and less are often needed.  In order to properly size a fan silencer, the flow rate through it must be sufficient to accommodate the maximum flow without imposing excessive pressure drop.

The Fan silencer is used to reduce the suction and discharge noise of the fan. It is an absorptive type silencers and very effective for high frequencies noise attenuation. Consequently, fan silencers shall be supplied in rectangular shape .The internal of fan silencer construct with series of rectangular baffle with aerodynamic design to offer minimum pressure drop.

The fluid passes through the internal baffles, the bafflers consist of mineral wool, scrim cloth, and wire mesh. The noise is absorbed by the packing material.

Application:

  • Power plant
  • Oil & Refineries
  • Engineering Industries
  • Steel Plants
  • Cement plants
  • Textile plants

The following data are required to design Fan silencer

  • Application
  • Flow rate
  • Temperature
  • Fan inlet/outlet size (Depending on application)
  • Allowable pressure drop
  • Noise criterion
  • Silencer noise spectrum in octave band