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 160‑200mm 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.