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Suspended ceiling return air plenum.
The space above the ceiling is not used as a return air plenum.
The space above a ceiling is often used as a return air plenum in many types of commercial buildings meaning exhaust air from the room below is moved from the space through the plenum and then to ductwork leading to the central hvac system.
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.
The suspended acoustic ceiling and lightweight plenum barrier work together effectively as a system to provide the same amount of sound isolation as the stc rated wall construction below the ceiling level.
However some drop ceiling designs create a.
Typically spaces between the structural floor or a dropped ceiling are considered plenum.
Plenum ceilings use the area between the dropped ceiling and the floor slab above as a return air path but when these dropped ceilings are removed the plenum area is reduced.
This is most common in commercial buildings schools hospitals or libraries.
Finding a viable return air path.
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The plenum barrier extends from the top of the partition to the underside of the floor or roof above blocking the plenum acoustically.
Some drop ceilings are actually designed tight enough to where air circulation.
A plenum space is the part of a building that enables air circulation by providing pathways for heated conditioned and return airflows at a higher pressure than normal.