Photo 1 of 4 Inch Backdraft Damper ABS Plastic Inline Extractor Fan Vent Back Draught Shutter, Suitable for 4in Pipelines, Designed for Anti Back Draught

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Photo 1 of 4 Inch Backdraft Damper ABS Plastic Inline Extractor Fan Vent Back Draught Shutter, Suitable for 4in Pipelines, Designed for Anti Back DraughtPhoto 2 of 4 Inch Backdraft Damper ABS Plastic Inline Extractor Fan Vent Back Draught Shutter, Suitable for 4in Pipelines, Designed for Anti Back Draught