From 315mm

Stepping down from 315mm spiral ducting? These 315mm duct reducers do exactly that, stepping down to 10 smaller diameters, from 300mm right down to 100mm. They’re used throughout commercial and industrial ventilation systems to change duct diameter cleanly between sections. Stocked items ordered by 3pm go out for next-day delivery; orders over £400 ex VAT include free UK mainland delivery.

Browse the whole spiral duct reducers category for every other size combination.