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.
References in periodicals archive ?
On the eve of the plenum, the party's history research office published a full-page article in the official People's Daily, repeating the warning against "negating" the two periods, a sign that debate still simmers.
Two kinds of word and deed are all too likely to come out of the plenum.
6 directed a follow-on investigation where numerical simulation was used to predict the transmission loss of plenums (Herrin et al.
The model requires two lighting heat gain parameters--the conditioned space/ceiling plenum split and the radiative/convective split (Spitler et al.
The NEC states that cables installed within plenum spaces must meet the traditional plenum-cable requirements of NFPA 262 and no mention is made of limited combustible cable.
The only pressure changes along the plenums lengths (z-axis) would be due to frictional losses, which are negligible for the short flow path in one bank.
An architect must be a provider of services, builder of peace and an occasional nay-sayer,' declared Frei Otto, introducing the plenum on 'Innovation and Tradition'.
The Student Plenum said they would issue a press release shortly.
The plenum method is a laboratory simulation of an ideal installation, with the diffuser inlet connected to a large plenum with ideally stagnant air.
In addition to achieving the levels of drying demanded, these plenums achieved it without the need for alterations to the block filler, plus more safely and at a much lower cost than the previously tried compressed air alternative.
As a result, building code officials are concerned about the buildup of cables in air-return plenum spaces, where much of this cabling is installed, because of its relatively easy access and almost universal proximity to work areas.
Plenumline, made from flame-retardant PVDF thermoplastic, suits challenging conditions such as those of highly restrictive return air plenums and high-temperature corrosive chemical waste streams.