Feature 1Airflow Damper: The one way backdraft damper enables auto oilu fume exhaustion and auto turning off, very reliable in backflow prevention. 2Secure Sealing: Strong spring and sealing allows for quick inclined gravity sealing, leaving no seams and ensuring no leakage or backflow. 3Better Fitting: Suits perfectly for 160200mm duct, the airflow blocker can be flexibly applied in bathroom, kitchen, cabinet and so on. 4Good Materials: Adopting premium ABS, stainless steel and silicone materials, not easy to break under pressure and very durable for using. 5Easy to Install: Comes with a light weight and a compact size as well, main body and mount can be separated for convenient installation.Item Type: Backdraft DamperMaterial: ABS, stainless steel, silicone. Applicable Pipe Diameter: Approx. 160 ~ 200mm / 6.3 ~ 7.87in .wang-edit-text{ font-family:'Arial' !important; } .wang-edit-text table { border-top: 1px solid #000; border-left: 1px solid #000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid #000; border-right: 1px solid #000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; }Package List1 x Backdraft Damper2 x Cable Tie1 x Drill Rod