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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. [1] [2]
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 ...
The company was founded by Charles J. August in 1957, originally as a franchise of another company, Midas Muffler. [2] In the mid-1960s, "Chuck" August decided that his muffler shops should offer an expanded list of services. This was not in line with the other organization's wishes. In 1966, he discontinued his affiliation with Midas Muffler. [2]
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Transmission loss (TL) in duct acoustics describes the acoustic performances of a muffler-like system.It is frequently used in the industry areas such as muffler manufacturers and NVH (noise, vibration and harshness) department of automobile manufacturers, and in academic studies.
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A cowboy muffler man with an American flag and cowboy hat that has been in Norwich since the mid-1960s. For his first 20 years he was on the other side of town. Previously belonged to amusement park owner Alex Cohen. The owners of Surplus Unlimited bought Big Bob in 1982.
Muffler men are large molded fiberglass sculptures that are placed as advertising icons, roadside attractions, or for decorative purposes, predominantly in the United States. Standing approximately 18–25 ft (5.5–7.6 m) tall, [ 1 ] the first figure was a Paul Bunyan character designed to hold an axe. [ 2 ]