The Atmosphere BDD8 round backdraft damper provides a durable one-way directional airflow solution for residential and commercial ventilation networks. Built with a robust galvanized steel collar housing and lightweight aluminum butterfly blades, this 8-inch insert prevents reverse airflow when exhaust fans are powered down. It functions as a defense against outside drafts, insects, or outdoor debris.
This spring-loaded backdraft assembly is designed for smooth integration inside range hoods, bathroom extractors, clothes dryer vents, and inline grow room fan setups. The double butterfly blades open smoothly under low static pressure conditions and snap closed via a spiral spring mechanism once the airflow stops. A built-in neoprene gasket guarantees a quiet, tightly sealed operation that reduces energy loss.
Installation is simple, allowing contractors or maintenance personnel to slip the entire sleeve directly into standard 8-inch round rigid or flexible duct lines. It can be mounted securely in either horizontal or vertical orientations, depending on the requirements of your ventilation layout. Always ensure correct airflow direction alignment before securing the outer seals.
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