Feature:1. Airflow Damper: The one way backdraft damper enables auto oilu fume exhaustion and auto turning off, very reliable in backflow prevention.2. Secure Sealing: Strong spring and sealing allows for quick inclined gravity sealing, leaving no seams and ensuring no leakage or backflow.3. Better Fitting: Suits perfectly for 160200mm duct, the airflow blocker can be flexibly applied in bathroom, kitchen, cabinet and so on.4. Good Materials: Adopting premium ABS, stainless steel and silicone materials, not easy to break under pressure and very durable for using.5. Easy to Install: Comes with a light weight and a compact size as well, main body and mount can be separated for convenient installation.Specification:Item Type: Backdraft DamperMaterial: ABS, stainless steel, silicone. Applicable Pipe Diameter: Approx. 160 ~ 200mm / 6.3 ~ 7.87in.Package List:1 xBackdraft Damper2 x Cable Tie1 x Drill Rod