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A draught excluding duct insert designed for use with hoods, bathroom fans and other home air conditioning applications. Includes 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 spring-loaded aluminium damping blades that open with minimal air flow. Suitable for 20.3 cm. Duct openings | Product length: 12.8 cm (5.04 inches) | Finish: powder coated