From 355mm
These 355mm spiral duct reducers connect 355mm (approx. 14″) diameter spiral ducting to a smaller duct size, stepping down to 11 smaller diameters, from 315mm right down to 100mm. Reducers are the standard way to drop duct diameter through a system as airflow splits off along the run, keeping air velocity where the design needs it. All 11 options on this page reduce from a 355mm end. Orders over £400 ex VAT qualify for free UK mainland delivery, and stocked items ordered by 3pm are sent next-day.
Need a different starting diameter? Browse the full range of spiral duct reducers.
Showing all 11 results
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Reducer – 355mm to – 100mm
£27.52 + VAT Add to basket -
Reducer – 355mm to – 125mm
£27.18 + VAT Add to basket -
Reducer – 355mm to – 150mm
£23.30 + VAT Add to basket -
Reducer – 355mm to – 160mm
£20.58 + VAT Add to basket -
Reducer – 355mm to – 180mm
£22.20 + VAT Add to basket -
Reducer – 355mm to – 200mm
£22.96 + VAT Add to basket -
Reducer – 355mm to – 224mm
£22.54 + VAT Add to basket -
Reducer – 355mm to – 250mm
£17.74 + VAT Add to basket -
Reducer – 355mm to – 280mm
£18.00 + VAT Add to basket -
Reducer – 355mm to – 300mm
£14.40 + VAT Add to basket -
Reducer – 355mm to – 315mm
£15.52 + VAT Add to basket