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 la ...

, 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 plenary session or plenum is a session of a conference or deliberative assembly in which all parties or members are present. Such a session may include a broad range of content, from keynotes to panel discussions, and is not necessarily relat ...

, 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 group necessary to constitute the group at a meeting. In a deliberative assembly (a body that uses parliamentary procedure, such as a legislature), a quorum is necessary to conduct the business of ...

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 __NOTOC__ Plenum cable is electrical cable that is laid in the plenum spaces of buildings. In the United States, plastics used in the construction of plenum cable are regulated under the National Fire Protection Association standard NFPA 90A: S ...

, electrical wire permitted in plenum spaces per building codes *

Plenum Publishing Corporation Springer Science+Business Media, commonly known as Springer, is a German multinational publishing company of books, e-books and peer-reviewed journals in science, humanities, technical and medical (STM) publishing. Originally founded in 1842 in ...

, 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 An air-mixing plenum (or mixing box) is used in building services engineering and HVAC construction for mixing air from different ductwork systems. Usage Air streams are mixed to save energy and improve energy efficiency by partially recircula ...

, a place where ducts meet

See also