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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.
Cost of Supply Air Plenums. Before understanding the costs associated with buying and installing supply air plenums, homeowners need to know how they function. A supply air plenum is a metal box that can be attached to the outlet of a furnace.It can also be attached to an air handler.These metal boxes are used as a central manifold for all of the ductwork to connect to.he cost of supply air plenums depends on the size of the supply air plenums that are purchased. Homeowners will need to pay attention to what size supply air plenums correctly attach to their furnaces. If a homeowner is unsure, the contractor hired to install the supply air plenum will be able to assess the system.