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Duct (flow)
Ducts are used in heating, ventilation, and air conditioning (HVAC) to deliver and remove air. The needed airflows include, for example, ''supply air'', ''return air'', and ''exhaust air''.〔The Fundamentals volume of the ''ASHRAE Handbook'', ASHRAE, Inc., Atlanta, GA, USA, 2005〕Ducts commonly also deliver ''ventilation air'' as part of the supply air. As such, air ducts are one method of ensuring acceptable indoor air quality as well as thermal comfort.
A duct system is also called ''ductwork''. Planning (laying out), sizing, optimizing, detailing, and finding the pressure losses through a duct system is called ''duct design''.〔''HVAC Systems – Duct Design'', 3rd Ed., SMACNA, 1990〕
==Materials==
Ducts can be made out of the following materials:
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