This backdraft damper is engineered to provide airflow management, preventing reverse airflow and maintaining a consistent ventilation flow. Its easy-to-install design and compatibility with various ducting systems make it a versatile choice for enhancing air quality and system efficiency in any 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 volume adjustment: the manual control valve offers precise adjustment capabilities, allowing for tailored airflow to meet specific requirements -Streamlined : the damper's streamlined design ensures passage, reducing turbulence and enhancing overall -Antibackflow design: equipped with an antibackflow design, this damper is ideal for preventing reverse airflow and escape in hvac and -Easy installation: the damper is designed for simple installation, making it easy to incorporate into existing ductwork without the need for special equipment -Diverse: the vent damper can be easily matched to different duct dimensions, ensuring a ideal fit for various applications Package list: 1 volume regulating valve