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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.
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.
An enclosed space inside a building or other structure, used for airflow. Often refers to the space between a dropped ceiling and the structural ceiling, or a raised floor and the hard floor. Distinct from ductwork as a plenum is part of the structure itself. Cable and piping
Plenum supply air temperature rise is the increase of the conditioned air due to convective heat gain as it travels through the underfloor supply plenum from the plenum inlet to the floor diffusers. [16] This phenomenon is also named thermal decay.
Plenum cable, electrical wire permitted in plenum spaces per building codes; Plenum Publishing Corporation, a publisher of scientific books and journals; Plenum (physics), a space completely filled with matter; Undergravel filters, in aquarium filtration, an open space under a layer of gravel or sand; Air-mixing plenum, a place where ducts meet
“One of the officers observed Crooks sitting on a picnic table at the front of the building from his location on the second floor of the building. Crooks then ran off, carrying a backpack.”
WHAT IS A PLENUM? The elite Central Committee of China's ruling Communist Party will hold a closed-door meeting from Monday to Thursday to set the major policies for the year ahead and beyond, and ...
The most common application for an air-mixing plenum is the mixing of return air (or extract air) with fresh air to provide a supply air mixture for onward distribution to the building or area which the ventilation system is serving. [1] The air transferred from the return air stream to the supply air stream is termed recirculated air.