Featuring a user-friendly installation process, this manual air vent valve is compatible with a wide range of duct systems. It offers multiple specifications and models to fit different duct sizes, providing flexibility and convenience for diverse applications. Enhance your HVAC system's performance with this damper. Features -Color:White -Material:PVC -Size:16.00X11.80X11.80cm/6.29X4.64X4.64in -Size:16.00X11.00X11.00cm/6.29X4.32X4.32in -Adjustable : the manual air vent valve offers adjustable control, allowing users to adjust airflow to meet specific ventilation needs -Enhanced airflow efficiency: with its smooth interior, the damper ensures enhanced airflow efficiency, reducing resistance and improving overall system effectiveness -Backdraft prevention: this damper is equipped with features to prevent backdraft, making it ideal for use in hvac systems and kitchen exhausts to maintain clean air -Userfriendly installation: designed for userfriendly installation, the damper can be easily integrated into existing ductwork, saving time and effort during setup -Versatile: ensuring compatibility with different ductwork configurations and providing a tailored fit for diverse applications Package list: 1 volume regulating valve