• Silencer Information

  • Silencer pressure drop will be added to overall fan SP unless otherwise specified. * Indoors: Large plant (10,000 sq. ft. min.) or Small Space (1000 sq. ft. min.) **Directivity: Q1 = Fan on an elevated riser. Q2 = Fan on a solid floor, not near any walls or major obstruction. Q4 = Fan on a solid floor near a single wall, not in a corner. Q8 = Fan on a solid floor and in a corner.


  1. A silencer affects only noise resulting from air turbulence within the fan. It does not affect noise radiated through the fan housing, mechanical noise produced by the motor & drive, or noise produced by vibration.
  2. Radiated noise can be reduced by insulating the fan housing and/or enclosing the fan. Mechanical noise produced by the motor and drive can be reduced by enclosing the fan.
  3. Sound pressure levels vary with characteristics of a given fan location (surrounding equipment, walls, outdoor or indoor environment, etc.). Therefore sound pressure levels cannot be guaranteed at an installation site.
  4. Silencers are intended to be supported externally (by others). Fans are not designed to support silencers.