4″
What’s available in 4″
Use this page to shop our Nordfab QF ducting and fittings by diameter: everything we sell in 4″ (≈ 4 inch) is gathered here, including branches and cut-ins, dampers, accessories and adaptors.
Alpha Air is a Leicester-based supplier of commercial and industrial ventilation equipment. Lead times are shown on each product page.
Prefer millimetres? The same products are listed under the 4 inch Nordfab size.
Showing 1–16 of 52 results
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Nordfab QF Cut In – 4 inch × 4 inch – 30° – Galvanised
£34.49 + VAT Add to basket -
Nordfab QF Cut In – 4 inch × 5 inch – 30° – Galvanised
£34.49 + VAT Add to basket -
Nordfab QF Cut In – 4 inch × 6 inch – 30° – Galvanised
£38.55 + VAT Add to basket -
Nordfab QF Cut In – 4 inch × 6 inch – 30° – Galvanised
£34.49 + VAT Add to basket -
Nordfab QF Cut In – 4 inch × 6 inch – 30° – Galvanised
£34.49 + VAT Add to basket -
Nordfab QF Cut In – 4 inch × 7 inch – 30° – Galvanised
£34.49 + VAT Add to basket -
Nordfab QF Cut In – 4 inch × 8 inch – 30° – Galvanised
£34.49 + VAT Add to basket -
Nordfab QF Cut In – 4 inch × 9 inch – 30° – Galvanised
£34.49 + VAT Add to basket -
Nordfab QF Cut In – 4 inch × 10 inch – 30° – Galvanised
£34.49 + VAT Add to basket -
Nordfab QF Cut In – 4 inch × 12 inch – 30° – Galvanised
£34.49 + VAT Add to basket -
Nordfab QF Cut In – 4 inch × 12½ inch – 30° – Galvanised
£34.49 + VAT Add to basket -
Nordfab QF Diverter RGSM Manual 2 and 0 inch /FB – 4 inch – 45° – Mild Steel
£368.33 + VAT Add to basket -
Nordfab QF Double Branch – 4 inch × 4 inch × 4 inch × 4 inch – 30° – Galvanised
£84.26 + VAT Add to basket -
Nordfab QF Reducer – 4 inch × 3 inch – Galvanised
£28.34 + VAT Add to basket -
Nordfab QF Silencer w/o Baffle – 4 inch – 0.6m – Galvanised
£169.89 + VAT Add to basket -
Nordfab QF Spark Trap Inline – 4 inch – Galvanised
£281.09 + VAT Add to basket