From 500mm
This page groups our 500mm spiral duct reducers — fittings that take a 500mm (approx. 20″) duct down to a smaller diameter, stepping down to 9 smaller diameters, from 450mm right down to 200mm. Choose the reducer whose small end matches the next duct size in your system and join it in line with your spiral ducting. Alpha Air is a Leicester-based ventilation supplier — these reducers are made to order and despatched in 3-5 working days.
Other starting sizes are listed under spiral duct reducers.
Showing all 9 results
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Reducer – 500mm to – 200mm
£34.92 + VAT Add to basket -
Reducer – 500mm to – 224mm
£34.70 + VAT Add to basket -
Reducer – 500mm to – 250mm
£29.40 + VAT Add to basket -
Reducer – 500mm to – 280mm
£29.82 + VAT Add to basket -
Reducer – 500mm to – 300mm
£30.24 + VAT Add to basket -
Reducer – 500mm to – 315mm
£26.20 + VAT Add to basket -
Reducer – 500mm to – 355mm
£25.26 + VAT Add to basket -
Reducer – 500mm to – 400mm
£28.46 + VAT Add to basket -
Reducer – 500mm to – 450mm
£30.98 + VAT Add to basket