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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.
Knauf Insulation Rigid Plenum Liner with ECOSEÂ® Technology is a heavy-density mat-faced glass mineral wool board insulation bonded with ECOSE Technology.Its base board is brown with a black mat facing to give the airstream a smooth, tough surface, that resists damage during installation and operation.igid Plenum Liner with ECOSE Technology is specifically designed as an interior insulation material for heating, ventilating and air conditioning plenums and sheet metal ducts.