Adjustable Air Outlet: Turn the center disc to open or close the vents. The airflow can be precisely adjusted according to your needs, ideal for walls and ceilings. Removable Design: The disc on the vent is removable, making cleaning and maintenance easier. With just a slight rotation and wiping with a damp cloth, the vent will be as good as new. Versatile Use: The disc valve can be used in the air inlet (indoor) and air outlet (outdoor), ideal for bedrooms, bathrooms, kitchens, small offices, attics. Compatible with 75mm suction hose. High-quality Material: The fan is made of high-quality ABS plastic, which is sturdy and abrasion-resistant, odorless and safe. The vent is compact and stable. Easy installation: with the reverse buckle device, slide the vent cover into the previously opened hole, turn slightly for fixation - Secure the pipe connection with hose clamps