From 400mm

Reduce from 400mm (approx. 16″) spiral ducting with this group of 400mm duct reducers, stepping down to 9 smaller diameters, from 355mm right down to 160mm. 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. Order stocked items by 3pm for next-day delivery, with free UK mainland delivery on orders over £400 ex VAT.

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