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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.
A housed fan is shown in Fig . 14 and a plenum fan is shown in Fig . 15 .Unlike the housed. fan, a plenum fan does not need an extended length of ductwork for the velocity. pressure to be converted to static pressure .With a plenum fan more of the airâs energy.