The duct manual volume damper is an essential component for maintaining optimal in HVAC systems. Its robust construction and precise airflow control capabilities make it suitable for both residential and commercial settings. Prevent unwanted airflow and ensure efficient ventilation 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 airflow: the manual duct damper allows for versatile airflow management, ensuring that ventilation can be adjusted to suit different environmental conditions -Optimized ventilation: featuring a smooth internal surface, the damper optimizes ventilation by minimizing air resistance and promoting efficient air movement -Effective wind blocking: designed to block unwanted wind and prevent backflow, this damper is ideal for primary air systems and range hoods, maintaining a clean and efficient airflow -Simple installation process: the damper's design facilitates a simple installation process, making it easy to integrate into various duct systems without the need for complex tools -Wide range of use: the hvac control can be matched to different duct dimensions, providing a versatile solution for various ventilation needs Package list: 1 volume regulating valve