Plenum may refer to:the antithesis of a
vacuum; in other words, completely-filled,
positive-pressure space (see
Plenism).the
pressures slightly above
atmospheric, usually inside air or
gas systems as the result of the action of
fans or blowers. The plenum is measured in small units of pressure such as
pascals (Pa) or ounces-force per square inch or
millimeters of mercury.a legislative meeting in which all members of the body are present and voting. Frequently this is used to refer to a full meeting of a
Communist Party central committee. Compare to
quorum.a second set of bellows in devices such as hand or foot pumped organs with a weight on the top which acts as an air reservoir.Plenums in
buildings are enclosed spaces that are not for human occupancy, but are often used for
heating, ventilating, and/or air-conditioning equipment and airflow, and for other equipment such as cables, piping, and luminaires. 'Plenum boxes' or sections are portions of HVAC
air handlers or terminal units.
Plenum cable refers to structured cabling permitted under building codes for plenum spaces. Plenum rated cable has slow-burning, fire-resistant casing that emits little smokePlenum filtration, a method of aquarium filtration using a deep sand bed with a gap below it.
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