Non-return valve stainless steel Silent ventilation connector with non-return valve Automatic extractor hood and hose connection for duct and

Check valve, stainless steel, muffler, vent fitting with non-return valve, automatic hood and hose connector for sewer and ventilation duct Style and size: half opening 100mm, 135 x 135mm, 100mm pipe installation hole be 100-135mm. Function Pipe fitting with non-return valve prevents exhaust air recirculation or cold outside air from entering. The flaps open when the fan pushes the exhaust air out and close automatically when the air flow stops. Blinds must be aligned horizontally for an optimal finish. Universality applies to all supply and exhaust air systems such as air conditioners, dryers, hoods and ventilation systems such as air fresheners, bathroom ventilation. The perfect choice for amateurs and professionals. Small fans can also open the dampers for smooth operation. Effectively prevent fumes from coming back, and fumes can only come out but not come in. The principle of operation of the check valve is that the vapors can only exit but not enter. Solve oil vapor problems