plenum

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plenum

[′plen·əm]
(engineering)
A condition in which air pressure within an enclosed space is greater than that in the outside atmosphere.

Plenum

The air space in an integrated ceiling, which may be above the atmospheric pressure if used for the air supply, or below the atmospheric pressure if used for the air exhaust.

Plenum

 

a meeting of the entire membership of the elected ruling organ of an organization, such as a party, state, or labor organization.

plenum

1. In suspended ceiling construction, the space between the suspended ceiling and the main structure above.

plenum

In a building, the space between the real ceiling and the dropped ceiling, which is often used as an air duct for heating and air conditioning. It is also filled with electrical, telephone and network wires. See plenum cable.