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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.
Figure 1: Components of a centrifugal fan An external motor belt driven inline centrifugal fan discharging inline to the exterior of a building through a duct. Unlike non-inline/non-concentric impeller casing design with a cutoff blade above, the concentrically symetric cylinder casing and impeller geometry of inline type redirects the outflow around so that it is parallel to the inflow of gases.
Save energy while cool down your home with this Hunter Fan Company 44-Inch Ultra Quiet Ceiling Fan. With three long blades, this fan utilizes a soft whisper motor for quiet use with the click of a ...
421.21 Flutes with external duct - The duct is outside the wall of the flute; this group includes flutes with the duct chambered in the wall under a ring-like sleeve and other similar arrangements. 421.211 (Single) flutes with external duct. 421.211.1 Open flutes with external duct. 421.211.11 Without fingerholes. 421.211.12 With fingerholes ...
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