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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.
It is recommended when the sides of the Plenum Box are exposed and with the following conditions: 1) The make-up air is cooled, or 2) the make-up air is not heated and outside temperatures are cool.Matte faced is the standard insulation.he plenum box shall be capable of delivering up to 150 CFM per lineal ft. of ventilator at a low velocity. The plenum box shall be designed to fit in front of the ventilator, either flush with the ceiling or dropped down in front of the ventilator.