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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.
Constructed of galvanized sheet metal, they serve as the starting point for the main trunk ductwork. Supply air plenums attach to the main supply outlet of your furnace, air handler unit or cased coil for central air conditioning applications.onstructed of galvanized sheet metal, they serve as the starting point for the main trunk ductwork. Supply air plenums attach to the main supply outlet of your furnace, air handler unit or cased coil for central air conditioning applications.