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Space between the structural ceiling and the dropped ceiling or under a raised floor is typically considered plenum; however, some drop-ceiling designs create a tight seal that does not allow for airflow and therefore may not be considered a plenum air-handling space. [1] [2]
High-voltage electrical equipment (generally regarded as being over 50 V) is not permitted to be exposed in the plenum space above a drop ceiling but must be enclosed in conduit or raceways and be physically isolated from low-voltage wiring. High-voltage electrical devices similarly must be enclosed in a plenum space, inside a metallic container.
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. [1]
Lend a Retro Vibe. Drop ceilings get a bad rep, but they can be a great way to disguise the inner workings of a basement—and they don't always have to make a space feel like a sad office ...
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 within a plenum must be properly rated for its fire and smoke indices. See also: plenum chamber psychrometric
Example of a typical commercial building with the space above the drop-ceiling acting as an air-return plenum. If a fire were to start above the drop ceiling, toxic fumes would be drawn into the open-air system and potentially poison building occupants before they are aware of the fire. Date: 10 April 2024: Source
Examples of plenum chambers include those used with: Superchargers; Hovercraft; Corliss steam engines; Raised floors and false ceilings in equipment rooms; Some organs (to supplement the bellows) [1] A number of aerophones, such as the bag of bagpipes and the slow air chamber of the Native American flute; Plenum chamber anesthetic vaporizers
By Paul Mohai, Byoung-Suk Kweon, Sangyun Lee, and Kerry Ard Air Pollution Around Schools Is Linked To Poorer Student Health And Academic Performance