Non-Return Damper
They are the elements that realize one-way air flow. There are three different types for mounting on the external wall: shot, suction nozzle and duct mounted. Exterior wall mounted models have two frame alternatives made of aluminum profile with 32mm and 50mm wide flanges. Duct mounted models are made of galvanized sheet metal with 35mm flange on both sides. The wings are made of aluminum sheet and are connected to each other with a connection mechanism for synchronized movement. The maximum length in one piece is 2000mm and height is I600mm. Larger models are made in the style of multi-piece attached shutters.
