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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.
UFAD systems use an underfloor supply plenum located between the structural concrete slab and a raised floor system to supply conditioned air to supply outlets (usually floor diffusers), located at or near floor level within the occupied space. Air returns from the room at ceiling level or the maximum allowable height above the occupied zone.
Plenum may refer to: Plenum chamber, a chamber intended to contain air, gas, or liquid at positive pressure; Plenism, or Horror vacui the concept that "nature abhors a vacuum" Plenum (meeting), a meeting of a deliberative assembly in which all members are present; contrast with quorum; Plenum space, enclosed spaces (in buildings) used for airflow
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.
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Aerospace physiology is the study of the effects of high altitudes on the body, such as different pressures and levels of oxygen. At different altitudes the body may react in different ways, provoking more cardiac output , and producing more erythrocytes .
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Plenum cable / ˈ p l ɛ n əm / 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: Standard for the Installation of Air Conditioning and Ventilating Systems.