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A sound attenuator, 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.
However, attenuators, dampers, access panels, etc. are a part of the ductwork even if they have more functions than conveying the air and are therefore also referred to as technical ductwork products. Ductwork airtightness is the fundamental ductwork property that impacts the uncontrolled leakage of air through duct leaks.
The attenuator is a specialty duct accessory that typically consists of an inner perforated baffle with sound-absorptive insulation. Sound attenuators may take the place of ductwork; conversely, inline attenuators are located close to the blower and have a bellmouth profile to minimize system effects.
An acoustic transmission line is the use of a long duct, which acts as an acoustic waveguide and is used to produce or transmit sound in an undistorted manner. Technically it is the acoustic analog of the electrical transmission line , typically conceived as a rigid-walled duct or tube, that is long and thin relative to the wavelength of sound ...
Both these type of tests and simulations allow to determine the acoustic attenuation in the far-field. Moreover, the acoustic performance is linked to the acoustic impedance which can be measured with one of the following techniques: Impedance tube or Kundt's tube; Flow-duct-facilities [5] In-situ method or Dean's method [6]
Transmission loss (TL) in duct acoustics is defined as the difference between the power incident on a duct acoustic device and that transmitted downstream into an anechoic termination. Transmission loss is independent of the source, [ 1 ] [ 2 ] if only plane waves are incident at the inlet of the device. [ 2 ]
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