Assertion: sound attenuator | /r/Synonym | a duct silencer
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text: A sound attenuator, also known as a duct silencer, sound trap, or muffler, is a special 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.