AC Infinity Backdraft Damper 4 Inch Galvanized Steel for Ducting

This 4-inch backdraft damper is designed to prevent cold air, odors, and debris from flowing backward through ducting in HVAC and ventilation systems. Its galvanized steel body provides durability while the spring-loaded aluminum blades open easily with minimal airflow. Dual outer rubber gaskets create a secure airtight seal, allowing the damper to mount horizontally or vertically without additional fasteners. Ideal for kitchen range hoods, bathroom fans, dryers, and grow room ventilation, this insert improves system efficiency and airflow direction. Key features • Prevents backdrafts and debris from entering 4-inch ducts • Outer rubber gaskets form a tight, secure airtight seal • Spring-loaded aluminum blades open with minimal airflow • Galvanized steel body with powder-coated finish • Mounts horizontally or vertically inside ducting Applications • Range hoods and kitchen ventilation • Bathroom exhaust fans and dryer vents • HVAC systems for heating and cooling • Grow room ducting and inline fan protection • Water heater draft protection and one-way airflow control Product specifications Manufacturer: AC Infinity Inc. Product Name: Backdraft Damper, 4" Product Model: AC-BDD4-B UPC Code: 819137021303 Duct Opening Size: 4 in Product Length: 5.03 in (12.8 cm) Body Material: Steel Shutter Material: Aluminum Color: Black Finish: Powder coat What’s included • Backdraft damper 4"