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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.
In this corner. Plenum-rated cable gets its name from an HVAC termâplenum spaces. The plenum spaces are those that lie between a drop and standard ceiling (or a similar version in the floor space) and it is this section where the air in a building circulates, thus aiding in heating and cooling functions.he plenum spaces are those that lie between a drop and standard ceiling (or a similar version in the floor space) and it is this section where the air in a building circulates, thus aiding in heating and cooling functions.