From 150mm

Reduce from 150mm (approx. 6″) spiral ducting with this group of 150mm duct reducers, stepping down to 80mm, 100mm and 125mm. A reducer joins two different diameters of spiral duct in one neat fitting — simply pick the smaller size you need to match the next section of your run. Alpha Air is a Leicester-based ventilation supplier — order stocked items by 3pm and they ship for next-day delivery.

You can also view every size combination in our complete spiral duct reducers range.