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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.
Return air plenums are the ducting units used as the central chamber for return air ducting. Furnaces and air handlers should have a return air plenum so that they can operate at their maximum efficiency.Return air plenums recycle the air in a structure back to the air handling unit and exhaust the air out of the home.enerally, a return air plenum will cost approximately $50 to $60 per unit. The other costs to consider are those for the labor and materials needed to install the return air plenum. The installation takes an average of about five hours with the sum of labor costs between $290 and $370.