Plenum

An enclosure in which air pressure is greater or less than outside the enclosure; most commonly refers to the space above a suspended ceiling in a commercial building when it is used as the return air for the HVAC system – a “plenum ceiling”; also used to refer to the main supply and return air ducts or trunks on an HVAC system – a “supply plenum” or a “return air plenum”

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2017-03-13T19:40:14+00:00