Sound Attenuator


The Sound Attenuator is intended to attenuate noise in ventilation ducts from the ventilator and air conditioner. A sound attenuators absorbs sound reverberating in a room, as it reflects on hard surfaces. Noise stop Systems provide a range of sound absorption panels. Sound attenuators are the best effective and highest sound-reducing standard noise control equipment now in production. When HVAC systems are in operation, they can be quite noisy. Various electrical and mechanical devices in the HVAC system, such as fans, transmit noise when in operation. In addition, the vibration of the system and pressure drop occurring at various points, such as when air passes through filters or dampers, also cause noise. Both circular and rectangular sound attenuators, also known as duct silencers, introduce sound-absorbing media in the air stream, thus removing acoustic energy from the air as it passes. The result is a reduced overall HVAC noise.

A sound attenuators, or duct silencer, sound trap, or muffler, is a noise control acoustical treatment of Heating Ventilating, and Air-Conditioning (HVAC) ductwork designed to reduce transmission of noise through the ductwork, either from equipment into occupied spaces in a building, or between occupied spaces. The fans also produce noise with the air vibration and movement of fins. The pressure drop causes the air changes in the system that is a cause of producing an annoying noise. The loose fixing of bolts and nuts even produces a loud noise.

The low-pressure drop can be utilized for the following:

  • For reducing the space required a smaller sound attenuator can be selected.
  • For reducing the pressure rise in the fan if the size is maintained.
  • For reducing the inherent sound generation in the system thanks to lower velocity and lower pressure rise.
  • For adapting the sound attenuator more easily to the connected duct system.