We get this question often when comparing the cost of a simple diffuser with integral backpan versus a diffuser face with a separate plenum. Why have a plenum? Why not just an integrated backpan? It would be cheaper, more compact and already assembled.Plenum boxes have multiple features which are mu ...

EffectiV HVAC is adding new options to its PERFAIR plenums for AXO, NEX, OTO and PLAY Diffusers. All plenums can now be ordered with factory-installed 1/2" acoustical insulation and 2" R6 thermal insulation in order to ensure optimal performance. PERFAIR plenums, normally featuring a stan ...