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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.
Silencer (silver) and exhaust pipe on a Ducati motorcycle A silencer cut open to show the insulation, chambers and piping inside the shell. A muffler (North American and Australian English) [1] or silencer (British English) is a device for reducing the noise emitted by the exhaust of an internal combustion engine—especially a noise-deadening device forming part of the exhaust system of an ...
Orfield Labs held the 2005 and 2013 Guinness World Record for the quietest place on Earth. Microsoft ’s anechoic chamber in Redmond, Washington eventually beat Orfield. Orfield retook the record in November 2021 with a sound level of (-)24.9 dbA.
For example, in the area around a jet engine, the sound power levels can be expected to be largest (i.e., loudest) directly in line with the jet's exhaust. Observations perpendicular to the exhaust would be significantly quieter. Hearing protection: An observer may be forced to wear ear plugs in areas of high ambient noise levels.
Noise control for aerodynamic sources include quiet air nozzles, pneumatic silencers and quiet fan technology. Since many mechanical sounds are inherently loud, the principal design element is to require the wall or ceiling assembly to meet certain performance standards, [ 21 ] (typically Sound transmission class of 50), which allows ...
The early morning killing of a top health insurance executive in midtown Manhattan Wednesday has unleashed a flurry of rage and frustration from social media users over denials of their medical ...
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