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Inlet box silencers - Model 133 industrial grade, all welded construction - dB Noise Reduction



  • Fan inlet silencers
  • Pressure blower inlet silencers
  • Motor silencers


  • Reduces cost on fans and blowers by serving as a combination silencer/fan inlet box, all in one
  • Much higher attenuations than straight through silencer designs due to acoustic elbow effect
  • Aerodynamically designed long radius elbow baffles (CR = 0.5) for minimum pressure drop


  • Galvanized and stainless steel mesh bird, insect and safety screens
  • Flanges match drilled to connecting equipment or ductwork; rectangular or circular
  • Mounting brackets, support legs, saddles and feet for silencer installation
  • Access panels and doors for inspection of internals
  • Variety of fabric, film and mesh baffle liners available for different types of service
  • Pressure and flow measurement devices including pressure taps, rings and piezometer tubes

Design options

  • Cleanable/removable baffle designs for dirty applications including special silencers that can be serviced in-situ
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Inlet box silencer features

Inlet box silencer features - image - dB Noise Reduction

Alternative construction - Model 132 standard grade, sheet metal silencers

Product details


Up to 500,000 acfm


Up to 120" wg


Up to 250° F (standard)
Up to 1,200° F (special)


From 12" X 12" X 24" long
to 120" X 120" X 240" long

Unit weight:

Up to 20,000 lbs


Carbon, galvanized and stainless steels,
aluminum, special alloys, high temperature
steels, FRP and PVC


14 ga to 3/8" welded casings with 18 ga
acoustic baffles

Paint finishes:

Alkyd, enamel, high heat, inorganic zinc,
epoxy and polyurethane

For other customized silencer designs, please contact us and we will be happy to assist you.


Servicing clients in the US, Canada, Mexico, and many international locations worldwide.