dB Noise Reduction LogodB Noise Reduction Logo
dB Noise Reduction Facebook page. dB Noise Reduction LinkedIn page.
 dB Noise Reduction toll free
Reactive mufflers - Model 333 industrial grade, all welded construction - dB Noise Reduction



  • The standard exhaust muffler for use on all internal combustion engines
  • Intake and exhaust silencers on PD blowers operating below their critical speed
  • Intake and exhaust silencers on reciprocating compressors
  • Other applications where low frequency noise control is needed

Design features

  • Four multi-chamber reactive muffler designs are available; Types A, B, C and D (equivalent to Industrial, Residential, Critical and Hospital grades)
  • Tuned reactive chambers and perforated tubes to remove low frequency pulsations and noise
  • End intake and exhaust, as well as side intake and exhaust connections available


  • Mounting brackets, support legs, saddles and feet for muffler installation
  • Tail pipes, rain cowls and caps
  • Access panels for inspection of internals
  • Companion flanges and expansion joints

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

Request a quote | dB Noise Reduction


Reactive muffler features

Reactive muffler features - image - dB Noise Reduction

Product details


Up to 60,000 acfm (standard)


Up to 120" wg


Up to 1,200° F


From 3" ID to 30" ID (standard)
Larger diameters available

Unit weight:

Up to 25,000 lbs


Carbon, stainless and corten steels


12 ga to 3/8" casings with 12 ga internals
designed for thermal expansion

Paint finishes:

High heat aluminum or black, as well as a
variety of low temperature paints

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


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