Usage Tips:200mm Adjustable Ventilation Grille. Made of ABS plastic. Adjustable air inlet by turning the knob. Detachable black tube, easy to clean. Ideal for ventilation and exhaust. Product Vent Vent Ideal for all clothes dryer ventilation pipes/pipes, bathroom ventilation openings and pull-outs, air conditioning systems, kitchen fans and pull-outs, all wall ventilation openings for households, heat transfer and ventilation systems, extractor hoods and a variety of other devices for industrial applications. The ABS plastic vent cover, panel and duct part are detachable, very convenient for daily cleaning. Easily install on the ceiling or sidewall Installed as an air inlet or outlet, the exhaust hood must cover the ventilation system to prevent rodents and insects from entering the house. This wall inlet has a grille guard and can rotate the knob to adjust the airflow. Quality Materials Ventilation holes are made of ABS. And we have different size exhaust holes for customers to choose. Airflow Is Adjustable Adjustable panel, you can adjust the airflow by rotating the button. The panel can be completely closed. Easy to Install and Clean The black sleeve is detachable, easy to clean and maintain. Wall or ceiling mounted, perfect for the room bathroom, the office, the evacuation of the room and the use of ventilation.