From 100mm

Need to step down from 100mm (approx. 4″) spiral ducting? This 100mm spiral duct reducer takes a 100mm duct down to 80mm, joining the two diameters in one neat in-line fitting. Reducers are used throughout spiral ducting systems wherever the duct diameter changes between sections — after a branch take-off, at a fan spigot or where space tightens. Stocked items ordered by 3pm go out for next-day delivery; orders over £400 ex VAT include free UK mainland delivery.

For every other size combination, browse the full range of spiral duct reducers.