4 Inch Backdraft Damper with Aluminum Foil Tape for Range Hoods & Grow Tents

Durable Galvanized Steel Construction: Made from premium galvanized steel with a black powder coat finish, this backdraft damper features spring-loaded aluminum blades for maximum durability. Length: 128mm, longer than most competing products.Optimized for Efficient Airflow: The 4-inch duct damper’s spring should be installed horizontally for optimal opening and closing, ensuring seamless airflow.Versatile HVAC Applications: Suitable for use with range hoods, exhaust fans, grow tents, and other home HVAC systems, including both flexible and non-flexible ducting.Smart Airflow Control: Valve wings open under positive airflow and automatically close when the air reverses, providing a one-way seal against backflow.Enhanced Airtight Design: Includes an internal foam ring and two external fastening rubber rings to improve air tightness and prevent leakage.