Round Back Draught Shutters

Plastic in-line back draught shutters stop air flowing backwards through a ventilation duct when the fan is off — keeping cold outside air, draughts and odours from blowing back into the room. The shutter sits in-line within the duct run: airflow from the fan pushes it open, and it closes again as soon as the fan stops.

Available in three diameters — 100mm, 125mm and 150mm — to push-fit into our round plastic ducting system. Fitting one is a five-minute upgrade that makes a real difference to comfort in kitchens, bathrooms and utility rooms, especially on runs that terminate on an exposed wall.

Ducting in flat channel instead? See our flat ducting shutters. For galvanised steel systems, we also stock metal non return dampers from 100mm to 400mm. Order by 3pm for next-day delivery on stocked sizes.