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OptiClimate Plenumbox 15000 PRO3 and PRO4. The plenum box is an insulated case that can be installed at the back of the OptiClimate 15000 PRO 3 or PRO 4. With a plenum box it is possible to place the OptiClimate outside the room or to use the Dual Room System with a three-way valve. The plenum box comes with four perforated holes that can be used to secure the air hose.