6 Inch Backdraft Damper, Stop Backdraft, Bugs & Fire Hazards, for Ventilation System

Easy installation: connector with backflow flap, the diameter of the air outlet is 150 mm, fits between solid plastic pipes and flexible ducting systems. Hose inserted into the check valve is fixed with clamps.Reasonable design: when the connector is closed, it can effectively prevent fumes from accumulating and rats from entering.High quality material: ABS material, waterproof and corrosion resistant, durable, is a good helper for ventilation of ducts.Wide application scenarios: connector is for use in applications, residential ventilation kitchens, toilets, bathrooms and hydroponics etc.TWO MOUNTING OPTIONS Horizontal and vertical mounting allows the connector with backflow flap to be used anywhere. This check valve is a gravity check valve, when installing the direction of the diverter plate must be observed.