- the antithesis of a Vacuum ; in other words, completely-filled, Positive-pressure space.
- 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 Pascal s (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 Building s 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 Handler s 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 smoke
- Plenum Filtration , a method of aquarium filtration using a deep sand bed with a gap below it.
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