In-line gravity operated back draught shutter. Will fit standard size 4" 100mm, 5" 125mm and 6" 150mm dia ducting.
Swiftair SMF 4" 5" 6" Mixed Flow Inline Fan Complete Kit Back Draught Shutter
Blauberg Back Draught Shutter Metal Ducting Non Return Valve Inline Ventilation
4in Back Draft Damper Accessories For Extractor Fan Vent Back Draught Shutter
Exhaust Fan, Wall Mounted Vent Fans Ventilation Wall Or Ceiling Mounted Exhaust Fan Bathroom Extractor Fan with Back Draught Shutter(ø150mm)
Swiftair Extractor Fan Wall Fixed Gravity Kit Back Draught Shutter 4" 5" 6"
4" 100mm 5" 125mm 6" 150mm in-line extractor fan back draught shutter Manrose
