In-line gravity operated back draught shutter. Will fit standard size 4" 100mm, 5" 125mm and 6" 150mm dia ducting.
4" 100mm 5" 125mm 6" 150mm in-line extractor fan back draught shutter Manrose
Metal Back Draught Shutter Damper Non Return Valve Vent Extractor Fan Ducting UK
4" 5" 6" Wall Plate With Spigots Connector Back Draught Shutter For Ducting
Metal Back Draught Shutter Damper, Spring Loaded Non Return Valve Backdraft Duct
4" 100mm, 5" 125mm, 6" 150mm in-line extractor fan vent back draught shutter
Manrose MF100T in-Line Extractor Fan with Timer 100mm/4" + in-Line Back Draught Shutter
