Features ABS Material The adjustable vents are made of ABS material with better hardness, which is safe, strong and durable. SPACE SAVING - You can use the vents for wall hanging or ceiling mount for easy ventilation without taking up too much space. Scope of Application This air vent is ideal for family rooms, offices, schools, libraries and other places that need better ventilation. Adjustable Air Flow You can adjust the airflow by turning the center panel of the ventilation cover for better drainage. Simple Installation Insert the vent directly into the appropriate hole, connect the duct pipe to the exhaust air, flexible and convenient. Specification: Item type: adjustable air vent. Material: ABS Scope of application: ideal for family rooms, offices, schools, libraries and other places requiring better ventilation. Package list: 1 x Adjustable Vent Package List 1 x Adjustable Air Vent