Exhaust Air Duct

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Exhaust duct systems are generally designed to convey contaminated air from industrial process and work spaces to the outdoors, while return air systems are generally designed to circulate “spent” air through a conditioning unit for reintroduction back into the conditioned space.

Exhaust duct systems are generally designed to convey contaminated air from industrial process and work spaces to the outdoors, while return air systems are generally designed to circulate “spent” air through a conditioning unit for reintroduction back into the conditioned space.

"Exhaust air", also measured by volume in CFM or CMH, is the air that is discarded from the facility. In natatoriums, this is often through dedicated exhaust fan(s), and/or an exhaust fan located within the return duct itself. Let's repeat that. Many natatoriums have their primary exhaust fan located within the return duct, or in the first chamber of the PDU. This is likely the reason for the confusion between the two terms, because both return and exhaust air can go through the same vent(s) in the natatorium.


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