Drop Ceiling Return Air Plenum

I know it can and has been done but curious whether certain situations would not allow.

Drop ceiling return air plenum.

The space above the ceiling is not used as a return air plenum. 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. 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.

Concrete slab ceiling above drop ceiling which is around 20 of store floor space and contacts only one 4 block. Hi all curious of any and all opinions about using drop ceiling as a return air plenum. Long story short my company was asked to move several ducts in order to install a higher drop ceiling. The assembly is constructed of 26 gauge sheet metal and the knock down design makes it easy to handle and assemble in the field.

The return air drop assembly is designed for the return air drop assembly is designed for up flow applications with side mount assembly and includes an exterior easy to access filter rack for a 1 in. This is most common in commercial buildings schools hospitals or libraries. 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. 602 2 of imc would allow plenum enclosure to be made of wood in this case because the building can be constructed with exposed wood framing.