Ø100 mm Adjustable ventilation grill. made of ABS plastic. Adjustable air flow by turning the knob. Detachable black tube, easy to clean. ideal for ventilation and evacuation. Product Description ventilation Ideal for all dryer ventilation pipes / pipes, bathroom openings and beds, ventilation systems air conditioning, kitchen fans and pulls, all ventilation openings Walls for households, heat transfer and ventilation systems, extractor hoods and a variety of other devices for industrial applications. High quality ABS plastic vent cover, panel and duct part are detachable, very convenient for daily cleaning. Easily mount to the ceiling or side wall installed as an air inlet or outlet, the exhaust hood should cover the ventilation system to prevent rodents and insects from entering in the House. This wall inlet has a grille guard and can rotate the knob to adjust the airflow. Quality materials The ventilation holes are made of high quality ABS. And we have different size exhaust holes