This backdraft damper is a versatile solution for preventing drafts and air backflow in your ducting system. With a 4-inch diameter, it fits perfectly into range hoods and bathroom fans to ensure proper ventilation and air circulation. Made by AC Infinity, a trusted brand in the industry, you can trust in the quality and durability of this product. Perfect for use in other heating, cooling, and air applications, this damper is a must-have for any home improvement project. Its simple yet effective design ensures that air flows in the right direction, while also reducing noise and vibration. Upgrade your ducting system today with this reliable antidraft damper from AC Infinity.