- All products are added to your cart.
OptiClimate Plenumbox 10000 PRO3 and PRO4. The plenum box is an insulated case that can be installed at the back of the OptiClimate 10000 PRO3 and PRO4. 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.