volume damper is designed to precisely control airflow, catering to various scenarios. Its smooth internal design ensures rapid ventilation, making it ideal for HVAC systems and range hoods. This damper effectively prevents backdraft and leakage, ensuring a clean and efficient environment. Features -Color:White -Material:PVC -Size:16.00X11.80X11.80cm/6.29X4.64X4.64in -Size:16.00X11.00X11.00cm/6.29X4.32X4.32in -Precise airflow control: volume damper allows for precise control of airflow, catering to various environmental needs and ensuring optimal ventilation -Smooth interior design: the damper features a smooth and flat interior, facilitating rapid and efficient , enhancing overall -Antibackflow function: designed to prevent backflow, this damper is ideal for fresh air systems and range hoods, effectively stopping reverse airflow and leakage -Easy installation: the damper is designed for simple and convenient installation, making it suitable for a wide range of duct systems without requiring tools -Versatile: this damper can accommodate different duct dimensions, providing flexibility for various installation requirements Package list: 1 volume regulating valve