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AC Infinity Backdraft Damper Ducting Insert, Black Galvanized Steel, 8" Humic & Fulvic Acids and VPD readingsAC INFINITY BACKDRAFT DAMPER DUCTING INSERT An anti draft duct insert designed for use with range hoods, bathroom fans and other home HVAC applications. Features outer rubber gaskets that create an airtight seal and grip between the damper and ducts. Mounts horizontally or vertically to prevent back flow and debris from entering ducting. Galvanized steel body with spring loaded aluminum damper blades that open with minimal airflow. Fit for 8 in. Duct
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