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Axial Duct Mounted

66 products

Duct-mounted axial and mixed-flow fans that sit inline within round ductwork to move air along a run. The range covers the S&P TD mixed-flow inline range (100–315mm, from the TD-160/100 up to the TD-2000/315), Systemair Prio circular duct fans (150–250mm) and Systemair AR Sileo cased axial fans (200–500mm) — in single- and three-phase, with silent and run-on timer versions.

All genuine Systemair and S&P, UK stock with next-day delivery available and trade pricing on multiples. Need help sizing a fan to your duct run and pressure? Email hello@efans.co.uk or call 0161 399 3825.

Cased Axial Fans / Commercial Box Fans / Ducting Silencers / Fan Speed Controllers

What is a duct-mounted (inline) fan?

An inline duct fan is installed within a length of round ducting rather than at a wall or roof, boosting airflow along the run. It's used to serve rooms set back from an external wall, to overcome the resistance of longer duct runs and bends, and to extract or supply through ceiling voids — common in bathrooms, kitchens, commercial extract and supply systems.

Mixed-flow or axial — which should I choose?

Mixed-flow fans (the S&P TD range) combine axial and centrifugal characteristics — quiet, compact and good against the moderate pressure of real duct runs, ideal for domestic and light-commercial systems. Cased axial fans (Systemair AR Sileo) move larger volumes at lower pressure and suit bigger commercial and industrial ducts. Send us the duct length, size and duty and we'll recommend the right type.

Which size fan do I need for my duct?

Match the fan's spigot to your duct diameter (100, 125, 150, 160, 200, 250, 315mm and up) and then check it delivers the airflow you need against the system resistance — longer runs, bends and grilles all add pressure. Oversizing slightly and running via a speed controller is quieter and more efficient. Share your duct details for a sizing check.

Single-phase or three-phase, and are they speed controllable?

Smaller fans are single-phase (230V); larger cased axials are available three-phase (400V) for efficiency. All the fans here are speed controllable — AC models via an electronic or transformer controller — and many S&P TD versions come with silent construction and a built-in run-on timer.

Showing 49 - 66 of 66 products

Systemair Prio Silent XP 200EC circular duct fan with 200mm diameter and EC motor for efficient ventilation.

Systemair Prio Silent XP 200EC circular duct fan with 200mm diameter and EC motor for efficient ventilation.

Product data sheet

In stock

Next day delivery
available

Systemair

SKU: 231065

Systemair Prio Silent XP 200EC Circular Duct Fan EC Motor - 200mm

1 Phase
EC Motor
Up to 1345 m³/h
Speed Controllable

In stock

Next day delivery available

£1,214.39

S&P TD-1300/250 inline mixed flow duct fan, 250mm single-phase ventilation fan with metal housing and airflow blades.

S&P TD-1300/250 inline mixed flow duct fan, 250mm single-phase ventilation fan with metal housing and airflow blades.

Product data sheet

In stock

Next day delivery
available

S&P

SKU: 5211016000

S&P TD-6000/400 Inline Mixed Flow Duct Fan Single Phase - 400mm

Up to 5100 m³/h
400mm connection
AC motor

In stock

Next day delivery available

£1,284.79

Systemair AR 560E4 Sileo Cased Axial Fan Single Phase - 560mm

Systemair AR 560E4 Sileo Cased Axial Fan Single Phase - 560mm

Product data sheet

In stock

Next day delivery
available

Systemair

Systemair AR 560E4 Sileo Cased Axial Fan Single Phase - 560mm

1 Phase
AC Motor
Up to 11930 m³/h
Speed Controllable

In stock

Next day delivery available

£1,302.39

Systemair Prio Silent XP 315E2 circular duct fan with AC motor, 315mm diameter, designed for efficient ventilation.

Systemair Prio Silent XP 315E2 circular duct fan with AC motor, 315mm diameter, designed for efficient ventilation.

Product data sheet

In stock

Next day delivery
available

Systemair

SKU: 234862

Systemair Prio Silent XP 315E2 Circular Duct Fan AC Motor - 315mm

1 Phase
AC Motor
Up to 2111 m³/h
Speed Controllable

In stock

Next day delivery available

£1,361.79

Systemair KVK Duo 150 EC Twin Duct Fan Single Phase - 150mm

Systemair KVK Duo 150 EC Twin Duct Fan Single Phase - 150mm

Product data sheet

In stock

Next day delivery
available

Systemair

Systemair KVK Duo 150 EC Twin Duct Fan Single Phase - 150mm

Up to 548 m³/h
150 mm connection
EC motor

In stock

Next day delivery available

£1,451.99

Systemair Prio Silent XP 315EC circular duct fan with EC motor, 315mm diameter, designed for efficient ventilation systems.

Systemair Prio Silent XP 315EC circular duct fan with EC motor, 315mm diameter, designed for efficient ventilation systems.

Product data sheet

In stock

Next day delivery
available

Systemair

SKU: 234863

Systemair Prio Silent XP 315EC Circular Duct Fan EC Motor - 315mm

1 Phase
EC Motor
Up to 2224 m³/h
Speed Controllable

In stock

Next day delivery available

£1,620.29

Systemair AR 400E4 Sileo cased axial fan, 400mm single-phase ventilation fan with metal casing for industrial or commercial use.

Systemair AR 400E4 Sileo cased axial fan, 400mm single-phase ventilation fan with metal casing for industrial or commercial use.

Product data sheet

In stock

Next day delivery
available

Systemair

Systemair AR 630E6 Sileo Cased Axial Fan Single Phase - 630mm

1 Phase
AC Motor
Up to 15926 m³/h
Speed Controllable

In stock

Next day delivery available

£1,647.79

Systemair AR 350DV Sileo three-phase cased axial fan with metal enclosure and adjustable mounting brackets.

Systemair AR 350DV Sileo three-phase cased axial fan with metal enclosure and adjustable mounting brackets.

Product data sheet

In stock

Next day delivery
available

Systemair

Systemair AR 630DV Sileo Cased Axial Fan Three Phase - 630

3 Phase
AC Motor
Up to 15926 m³/h
Speed Controllable

In stock

Next day delivery available

£1,779.79

Systemair KVK Duo 250 EC Twin Duct Fan Single Phase - 250mm

Systemair KVK Duo 250 EC Twin Duct Fan Single Phase - 250mm

Product data sheet

In stock

Next day delivery
available

Systemair

Systemair KVK Duo 250 EC Twin Duct Fan Single Phase - 250mm

Up to 1152 m³/h
250 mm connection
EC motor

In stock

Next day delivery available

£2,037.19

Systemair AR 400E4 Sileo cased axial fan, 400mm single-phase ventilation fan with metal casing for industrial or commercial use.

Systemair AR 400E4 Sileo cased axial fan, 400mm single-phase ventilation fan with metal casing for industrial or commercial use.

Product data sheet

In stock

Next day delivery
available

Systemair

Systemair AR 710E6 Sileo Cased Axial Fan Single Phase - 710mm

1 Phase
AC Motor
Up to 13892 m³/h
Speed Controllable

In stock

Next day delivery available

£2,182.39

Systemair AR 350DV Sileo three-phase cased axial fan with metal enclosure and adjustable mounting brackets.

Systemair AR 350DV Sileo three-phase cased axial fan with metal enclosure and adjustable mounting brackets.

Product data sheet

In stock

Next day delivery
available

Systemair

Systemair AR 800DS Sileo Cased Axial Fan Three Phase - 800mm

3 Phase
AC Motor
Up to 22255 m³/h
Speed Controllable

In stock

Next day delivery available

£2,333.09

Systemair AR 350DV Sileo three-phase cased axial fan with metal enclosure and adjustable mounting brackets.

Systemair AR 350DV Sileo three-phase cased axial fan with metal enclosure and adjustable mounting brackets.

Product data sheet

In stock

Next day delivery
available

Systemair

Systemair AR 710DV Sileo Cased Axial Fan Three Phase - 710

3 Phase
AC Motor
Up to 22576 m³/h
Speed Controllable

In stock

Next day delivery available

£2,359.49

Systemair KVK Duo 315 EC Twin Duct Fan Single Phase - 315mm

Systemair KVK Duo 315 EC Twin Duct Fan Single Phase - 315mm

Product data sheet

In stock

Next day delivery
available

Systemair

Systemair KVK Duo 315 EC Twin Duct Fan Single Phase - 315mm

Up to 2008 m³/h
315 mm connection
EC motor

In stock

Next day delivery available

£2,360.59

Systemair AR 350DV Sileo three-phase cased axial fan with metal enclosure and adjustable mounting brackets.

Systemair AR 350DV Sileo three-phase cased axial fan with metal enclosure and adjustable mounting brackets.

Product data sheet

In stock

Next day delivery
available

Systemair

Systemair AR 910DS Sileo Cased Axial Fan Three Phase - 900

3 Phase
AC Motor
Up to 27583 m³/h
Speed Controllable

In stock

Next day delivery available

£3,452.89

Systemair AR 350DV Sileo three-phase cased axial fan with metal enclosure and adjustable mounting brackets.

Systemair AR 350DV Sileo three-phase cased axial fan with metal enclosure and adjustable mounting brackets.

Product data sheet

In stock

Next day delivery
available

Systemair

Systemair AR 1000DS Sileo Cased Axial Fan Three Phase - 1000

3 Phase
AC Motor
Up to 36468 m³/h
Speed Controllable

In stock

Next day delivery available

£3,653.09

Systemair KVK Duo 400 EC Twin Duct Fan Single Phase - 400mm

Systemair KVK Duo 400 EC Twin Duct Fan Single Phase - 400mm

Product data sheet

In stock

Next day delivery
available

Systemair

SKU: 449462

Systemair KVK Duo 400 EC Twin Duct Fan Single Phase - 400mm

Up to 4492 m³/h
400 mm connection
EC motor

In stock

Next day delivery available

£3,892.89

Systemair KVK Duo 500 EC Twin Duct Fan Three Phase - 500mm

Systemair KVK Duo 500 EC Twin Duct Fan Three Phase - 500mm

Product data sheet

In stock

Next day delivery
available

Systemair

Systemair KVK Duo 500 EC Twin Duct Fan Three Phase - 500mm

Up to 6422 m³/h
500 mm connection
EC motor

In stock

Next day delivery available

£4,855.39

Systemair KVK Duo 630 EC Twin Duct Fan Three Phase - 630mm

Systemair KVK Duo 630 EC Twin Duct Fan Three Phase - 630mm

Product data sheet

In stock

Next day delivery
available

Systemair

SKU: 448246

Systemair KVK Duo 630 EC Twin Duct Fan Three Phase - 630mm

Up to 13154 m³/h
630 mm connection
EC motor

In stock

Next day delivery available

£6,070.89

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