From 160mm

Every spiral duct reducer here has a 160mm large end, stepping down to 80mm, 100mm, 125mm and 150mm. Use one wherever your ductwork steps down in diameter — after a branch take-off, at a fan spigot or where space tightens. Order stocked items by 3pm for next-day delivery, with free UK mainland delivery on orders over £400 ex VAT.

For reducers starting from other diameters, see all spiral duct reducers.