Plenum may refer to: *

Plenum chamber A plenum chamber is a pressurised housing containing a fluid (typically air) at positive pressure. One of its functions is to equalise pressure for more even distribution, compensating for irregular supply or demand. It is typically relatively ...

, a chamber intended to contain air, gas, or liquid at positive pressure * Plenism, or ''Horror vacui'' (physics) the concept that "nature abhors a vacuum" * Plenum (meeting), a meeting of a deliberative assembly in which all members are present; contrast with

quorum A quorum is the minimum number of members of a deliberative assembly (a body that uses parliamentary procedure, such as a legislature) necessary to conduct the business of that group. According to '' Robert's Rules of Order Newly Revised'', the ...

Plenum space A plenum space is a part of a building that can facilitate air circulation for heating and air conditioning systems, by providing pathways for either heated/conditioned or return airflows, usually at greater than atmospheric pressure. Space ...

, enclosed spaces (in buildings) used for airflow * Plenum cable, electrical wire permitted in plenum spaces per building codes * Plenum Publishing Corporation, a publisher of scientific books and journals *

Plenum (physics) Luminiferous aether or ether ("luminiferous", meaning "light-bearing") was the postulated medium for the propagation of light. It was invoked to explain the ability of the apparently wave-based light to propagate through empty space (a vacuum) ...

, a space completely filled with matter * Undergravel filters, in aquarium filtration, an open space under a layer of gravel or sand *

Air-mixing plenum In building services engineering and HVAC, an air-mixing plenum (or mixing box) is used for mixing air from different ductwork systems. Usage The most common application for an air-mixing plenum is the mixing of ''return air'' (or ''extract air ...

, a place where ducts meet

See also