A sound attenuator, also known as a duct silencer, sound trap, or muffler, is a noise control acoustical treatment of HVAC ductwork meant to limit noise transmission via the ductwork, either from equipment into occupied rooms in a building or between occupied spaces.

A sound attenuator is essentially just a baffle inside the ducting. Sound-absorbing materials are frequently used in these baffles. The physical parameters and baffle arrangement of sound attenuators are chosen to attenuate a certain frequency range. Sound attenuators may offer broader band attenuation in very short lengths, in contrast to typical internally-lined ductwork, which is primarily effective in reducing mid- and high-frequency noise. A Helmholtz resonator is essentially what some forms of sound attenuators are when utilized as a passive noise-control mechanism.

Options Available Upon Request

  • Air gap: 50mm – 250mm to suit product requirement
  • Casing Material: Aluminium or SS.
  • Baffle thickness : 100mm or 300 mm
  • Flange : M.S angle framed
  • Flange width : 30mm or 40mm
  • Media : Fiber glass woven glass fabric as liner

Installation Manual

  • Place the silencer farther away from the noise generator, such as the air handler or blower, to allow for the development of a uniform flow profile. To increase the effectiveness of the silencer, leave at least 2 to 5 duct diameters upstream and downstream of the silencer.
  • While installing or storing, avoid exposing the silencer to excessive moisture or dirt.
  • In order to minimize microbial growth in the silencer and duct system, the HVAC system needs to be carefully built for optimum dehumidification and air filtering.
  • In order to prevent noise regeneration, it is advised to place the silencer after the volume control damper.