Ruck 10 Inch Backdraft Damper - Spring-Loaded, Galvanized Steel, 149396

Ruck 10 Inch Backdraft Damper for Exhaust and Intake Ducts

This Ruck back draught damper keeps air moving one way through a 10-inch round duct. It fits into the duct run as a short inline section. Inside, spring-loaded aluminum flaps swing open when the fan pushes air through. When the fan stops, the springs pull the flaps shut against a rubber seal. That stops outside air, cold drafts and odors from flowing back down the duct. The housing is galvanized sheet steel. Overall length is 5.1 in, and the weight is 2.0 lb. Because the flaps are spring-loaded, the damper works in a horizontal or a vertical run. Ruck lists it as part 149396. Sylvane lists it as compatible with Ruck fans 147887, 147896, 147491, 147680, 147500, 147689 and 147707.

Fitting a Spring Loaded Backdraft Damper in the Duct Run

Fit the damper on the outlet side of the exhaust fan, or close to where the duct leaves the building. Before fixing it, check which way the flaps open so they swing with the fan's airflow. Push each duct end over a collar, then clamp it and seal the seam with foil tape. A sealed joint keeps the airflow going through the flaps instead of leaking around them. Leave room for the flaps to open fully, and avoid a tight elbow right against the damper. In a grow room, the closed flaps keep outdoor air and insects from drifting in while the exhaust fan is off. They also hold conditioned air inside rather than letting it escape through an idle duct. In winter, the damper limits cold air sinking back into a heated room. On an intake line, it stops room air from leaking out whenever the intake fan cycles off. Look at the flaps now and then for dust buildup, which can stop them sealing. Wipe the rubber seal clean so it keeps closing tight.

Key Features

• 10 in Duct Size: Fits a 10-inch round duct run.
• Spring-Loaded Flaps: Aluminum flaps open with airflow and close when it stops.
• Rubber Seal: Holds the flaps shut against backdraft.
• Galvanized Steel Housing: Sheet steel body for duct installation.
• Any Orientation: Mounts in horizontal or vertical ducts.
• Short Inline Section: Adds only 5.1 in to the run.

Technical Specifications