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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.
If the chimney already has a stainless-steel chimney liner but the liner is fitted the wrong way up, it needs to be turned around otherwise the chimney can leak tar and condensation. [1] A flexible flue liner prevents a carbon monoxide leak, chimney fire, or creosote buildup. The creosote build-up is the fuel inside the flue that causes the ...
A centrifugal fan is a mechanical device for moving air or other gases in a direction at an angle to the incoming fluid. Centrifugal fans often contain a ducted housing to direct outgoing air in a specific direction or across a heat sink; such a fan is also called a blower, blower fan, or squirrel-cage fan (because it looks like a hamster wheel).
A household electric fan A large cylindrical fan. A fan is a powered machine that creates airflow. A fan consists of rotating vanes or blades, generally made of wood, plastic, or metal, which act on the air. The rotating assembly of blades and hub is known as an impeller, rotor, or runner. Usually, it is contained within some form of housing ...
Ventilation of an area by the use of a fan to push clean air into that space and controlled use of openings for the escape of smoke and gasses. Post indicator valve (PIV) A type of valve used for underground piping, having a lockable actuator atop a post with a window indicating "open" or "shut" status of the valve.
For insulation purposes, metal ducts are typically lined with faced fiberglass blankets (duct liner) or wrapped externally with fiberglass blankets (duct wrap). When necessary, a double walled duct is used. This will usually have an inner perforated liner, then a 1–2" (2.5-5 cm) layer of fiberglass insulation contained inside an outer solid pipe.