OptiClimate Plenumbox 3500 PRO3. The plenum box is an insulated case that can be installed at the back of the OptiClimate 3500 PRO3. 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.

• Suitable for: OptiClimate 3500 PRO3
• Dimensions: 480 x 399mm
• Flange: 250 mm
• Especially for: Dual-Room set-up and if an OptiClimate is placed outside the room