AC Infinity Backdraft Damper Ducting Insert, 4-Inch, Black Galvanized Steel lighting 1000W CMH Grow Lamps for

1000W CMH Grow Lamps for the ILUMINAR CMH Fixture

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AC Infinity Backdraft Damper Ducting Insert, 4-Inch, Black Galvanized Steel lighting 1000W CMH Grow Lamps forDescription Antidraft duct insert: This item is designed for use with range hoods, bathroom fans, and other home HVAC applications. It features outer rubber gaskets that create an airtight seal and grip between the damper and ducts. Mounting options: The product mounts horizontally or vertically to prevent backflow and debris from entering the ducting. It is made of galvanized steel with spring loaded aluminum damper blades that open with minimal