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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.
An air handler, or air handling unit (often abbreviated to AHU), is a device used to regulate and circulate air as part of a heating, ventilating, and air-conditioning system. [1] An air handler is usually a large metal box containing a blower, furnace or A/C elements, filter racks or chambers, sound attenuators, and dampers. [2]
A noise-cancellation speaker emits a sound wave with the same amplitude but with an inverted phase (also known as antiphase) relative to the original sound. The waves combine to form a new wave, in a process called interference , and effectively cancel each other out – an effect which is called destructive interference .
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 ]
Architectural acoustics (also known as building acoustics) is the science and engineering of achieving a good sound within a building and is a branch of acoustical engineering. [1] The first application of modern scientific methods to architectural acoustics was carried out by the American physicist Wallace Sabine in the Fogg Museum lecture room.
Amazon (NASDAQ:AMZN) is another AI frontrunner that could make noise in 2025. Shares of the e-commerce giant are actually a top internet pick over at Citi despite gaining nearly 50% in 2024.
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