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An anti-current duct insert designed for use with hoods, bathroom fans and other home HVAC applications. Features external rubber seals that create an airtight seal and grip between the shock absorber and ducts. Mounts horizontally or vertically to prevent backflow and debris from entering the duct. Galvanised steel body with aluminium spring loaded damper blades that open with minimal air flow. Suitable for 8 inches. Duct Openings | Product Length: 5" | Finish: Powder Coated