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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]
The end of the final length of the exhaust pipe where it vents to open air, generally the only visible part of the exhaust system part on a vehicle, often ends with a straight or angled cut but may include a decorative tip. The tip is sometimes chromed. It frequently has a larger pipe than the rest of the exhaust system.
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 ...
France: silencers for rimfire pistols are sold without government oversight in France. [39] Germany: a silencer is treated the same in the eyes of the law as the weapon it is designed for. Accordingly, suppressors for air guns, which can be purchased by anyone over 18 years of age, can be purchased by anyone over 18. A hunting license allows ...
The U.S. has spent millions of dollars to send contraceptives to other countries. Did Trump's White House really stop $50 million in condoms for Gaza?
The wider the pipe, the greater the suppression. Thus, other factors being equal, wide pipes are poor in harmonics, and narrow pipes are rich in harmonics. The scale of a pipe refers to its width compared to its length, and an organ builder will refer to a flute as a wide-scaled stop, and a string-toned gamba as a narrow-scaled stop.
The PBS-1 silencer, designed for use with the AKM to reduce the noise when firing, was introduced in the 1960s, and was used mostly by Spetsnaz forces and the KGB. [3] [4] [5] They were used by the Spetsnaz in the Soviet–Afghan War in the 1980s, requiring the use of the AKM (modernized variant of the AK-47), because the newer AK-74 did not have a silencer available. [6]
SilencerCo Osprey .45 suppressor on a Springfield pistol. SilencerCo was founded in 2008 by former President Jonathon Shults and Joshua Waldron. [3] Soon after, SilencerCo launched its first product, a .22 caliber silencer called the Sparrow. [4]