Insert check valve DN 150 mm extractor extractor. Especially suitable for inserting into exhaust hose. Perfect for use in tumble dryers, bathrooms, garages, air conditioners, fans, cooker hoods, ventilation systems. The folding valve opens and closes automatically and allows only one air flow in one direction, preventing cold air from entering. The flap blades open only in the direction of the air flowing when the blind is mounted. The shaft axle must be vertical when installing the backflow flap and best installed in a horizontal position and inserted completely into the pipe. This also applies to vertical installation. The housing of the flap is made of galvanised sheet steel. The valve blades are made of aluminium. Shaft and spring are made of stainless steel. The inner rubber seal is used for better tightness and noise reduction. The outer foam sealing strip ensures a good sealing and fixing of the backflow flap in the channel. The flap valve can be inserted directly into a non-flexible metal or plastic duct, but for a flexible channel, you need to use steel pipe clamps to secure the check valve. We have a 24-month. You can't go wrong with purchasing this slip backflow flap. Please contact us directly if you have any questions. We will reply within 2 hours.