From 900mm
These 900mm spiral duct reducers connect 900mm diameter spiral ducting to a smaller duct size, stepping down to 8 smaller diameters, from 800mm right down to 450mm. 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 8 options on this page reduce from a 900mm end. Alpha Air is a Leicester-based ventilation supplier — these reducers are made to order and despatched in 3-5 working days.
Need a different starting diameter? Browse the full range of spiral duct reducers.
Showing all 8 results
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Reducer – 900mm to – 450mm
£113.74 + VAT Add to basket -
Reducer – 900mm to – 500mm
£101.94 + VAT Add to basket -
Reducer – 900mm to – 560mm
£98.74 + VAT Add to basket -
Reducer – 900mm to – 600mm
£95.26 + VAT Add to basket -
Reducer – 900mm to – 630mm
£93.50 + VAT Add to basket -
Reducer – 900mm to – 710mm
£99.22 + VAT Add to basket -
Reducer – 900mm to – 762mm
£99.22 + VAT Add to basket -
Reducer – 900mm to – 800mm
£90.28 + VAT Add to basket