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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 25 - 48 of 66 products

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 350E4 Sileo Cased Axial Fan Single Phase - 350mm

1 Phase
AC Motor
Up to 3276 m³/h
Speed Controllable

In stock

Next day delivery available

£526.89

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: 5212316900

S&P TD-1300/250 Inline Mixed Flow Duct Fan Single Phase - 250mm

Up to 1400 m³/h
250mm connection
AC motor

In stock

Next day delivery available

£547.79

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: 5211309700

S&P TD-2000/315 Inline Mixed Flow Duct Fan Single Phase - 315mm

Up to 1800 m³/h
315mm connection
AC motor

In stock

Next day delivery available

£552.19

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 400E4 Sileo Cased Axial Fan Single Phase - 400mm

1 Phase
AC Motor
Up to 4414 m³/h
Speed Controllable

In stock

Next day delivery available

£564.29

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 400DV-L Sileo Cased Axial Fan Three Phase - 400

3 Phase
AC Motor
Up to 4392 m³/h
Speed Controllable

In stock

Next day delivery available

£604.99

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 450E4 Sileo Cased Axial Fan Single Phase - 450mm

1 Phase
AC Motor
Up to 7301 m³/h
Speed Controllable

In stock

Next day delivery available

£721.59

S&P TD-1000/200 silent inline mixed flow duct fan, 200mm single-phase ventilation fan with compact design

S&P TD-1000/200 silent inline mixed flow duct fan, 200mm single-phase ventilation fan with compact design

Product data sheet

In stock

Next day delivery
available

S&P

SKU: 5211305300

S&P TD-1000/200 Silent Inline Mixed Flow Duct Fan Single Phase - 200mm

Up to 1040 m³/h
200mm connection
AC motor

In stock

Next day delivery available

£740.29

Systemair Prio Silent XP 150E2 circular duct fan with AC motor, 150mm diameter, used for ventilation systems.

Systemair Prio Silent XP 150E2 circular duct fan with AC motor, 150mm diameter, used for ventilation systems.

Product data sheet

In stock

Next day delivery
available

Systemair

SKU: 231060

Systemair Prio Silent XP 150E2 Circular Duct Fan AC Motor - 150mm

1 Phase
AC Motor
Up to 420 m³/h
Speed Controllable

In stock

Next day delivery available

£762.29

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 450DV Sileo Cased Axial Fan Three Phase - 450

3 Phase
AC Motor
Up to 7159 m³/h
Speed Controllable

In stock

Next day delivery available

£765.59

Systemair Prio Silent XP 160E2 circular duct fan with AC motor, 160mm diameter for ventilation systems

Systemair Prio Silent XP 160E2 circular duct fan with AC motor, 160mm diameter for ventilation systems

Product data sheet

In stock

Next day delivery
available

Systemair

SKU: 231062

Systemair Prio Silent XP 160E2 Circular Duct Fan AC Motor - 160mm

1 Phase
AC Motor
Up to 431 m³/h
Speed Controllable

In stock

Next day delivery available

£768.89

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 500E4 Sileo Cased Axial Fan Single Phase - 500mm

1 Phase
AC Motor
Up to 8878 m³/h
Speed Controllable

In stock

Next day delivery available

£811.79

Systemair Prio Silent XP 200E2 circular duct fan with 200mm diameter and AC motor, designed for quiet ventilation.

Systemair Prio Silent XP 200E2 circular duct fan with 200mm diameter and AC motor, designed for quiet ventilation.

Product data sheet

In stock

Next day delivery
available

Systemair

SKU: 231064

Systemair Prio Silent XP 200E2 Circular Duct Fan AC Motor - 200mm

1 Phase
AC Motor
Up to 956 m³/h
Speed Controllable

In stock

Next day delivery available

£839.29

Systemair Prio 315 Circular Duct AC Motor - eFans Direct Ltd

Systemair Prio 315 Circular Duct AC Motor - eFans Direct Ltd

Product data sheet

In stock

Next day delivery
available

Systemair

Systemair Prio 315 Circular Duct Fan AC Motor - 315mm

Up to 3812 m³/h
315mm connection
AC motor

In stock

Next day delivery available

£868.04

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 500DV Sileo Cased Axial Fan Three Phase - 500

3 Phase
AC Motor
Up to 9140 m³/h
Speed Controllable

In stock

Next day delivery available

£870.09

Systemair Prio Silent XP 160EC Circular Duct Fan EC Motor - 160mm

Systemair Prio Silent XP 160EC Circular Duct Fan EC Motor - 160mm

Product data sheet

In stock

Next day delivery
available

Systemair

SKU: 231063

Systemair Prio Silent XP 160EC Circular Duct Fan EC Motor - 160mm

1 Phase
EC Motor
Up to 788 m³/h
Speed Controllable

In stock

Next day delivery available

£904.19

S&P TD-800/200 silent inline mixed flow duct fan with 200mm diameter, single-phase, mounted for ventilation and air circulation.

S&P TD-800/200 silent inline mixed flow duct fan with 200mm diameter, single-phase, mounted for ventilation and air circulation.

Product data sheet

In stock

Next day delivery
available

S&P

SKU: 5212317400

S&P TD-1300/250 Ultra Quiet Mixed Flow Duct Fan Single Phase - 250mm

Up to 1320 m³/h
250mm connection
AC motor

In stock

Next day delivery available

£952.59

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: 5211015200

S&P TD-4000/355 Inline Mixed Flow Duct Fan Single Phase - 355mm

Up to 3750 m³/h
355mm connection
AC motor

In stock

Next day delivery available

£1,020.66

Systemair Prio Silent XP 250E2 circular duct fan with 250mm diameter and AC motor for efficient ventilation.

Systemair Prio Silent XP 250E2 circular duct fan with 250mm diameter and AC motor for efficient ventilation.

Product data sheet

In stock

Next day delivery
available

Systemair

SKU: 231066

Systemair Prio Silent XP 250E2 Circular Duct Fan AC Motor - 250mm

1 Phase
AC Motor
Up to 2039 m³/h
Speed Controllable

In stock

Next day delivery available

£1,039.49

Systemair Prio Silent XP 150EC circular duct fan with EC motor, 150mm diameter, designed for quiet ventilation.

Systemair Prio Silent XP 150EC circular duct fan with EC motor, 150mm diameter, designed for quiet ventilation.

Product data sheet

In stock

Next day delivery
available

Systemair

SKU: 231061

Systemair Prio Silent XP 150EC Circular Duct Fan EC Motor - 150mm

1 Phase
EC Motor
Up to 764 m³/h
Speed Controllable

In stock

Next day delivery available

£1,091.19

S&P TD-800/200 silent inline mixed flow duct fan with 200mm diameter, single-phase, mounted for ventilation and air circulation.

S&P TD-800/200 silent inline mixed flow duct fan with 200mm diameter, single-phase, mounted for ventilation and air circulation.

Product data sheet

In stock

Next day delivery
available

S&P

SKU: 5212316700

S&P TD-2000/315 Ultra Quiet Mixed Flow Duct Fan Single Phase - 315mm

Up to 1770 m³/h
315mm connection
AC motor

In stock

Next day delivery available

£1,116.49

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 560DV Sileo Cased Axial Fan Three Phase - 560

3 Phase
AC Motor
Up to 11340 m³/h
Speed Controllable

In stock

Next day delivery available

£1,141.79

Systemair Prio 355 Circular Duct AC Motor - eFans Direct Ltd

Systemair Prio 355 Circular Duct AC Motor - eFans Direct Ltd

Product data sheet

In stock

Next day delivery
available

Systemair

Systemair Prio 355 Circular Duct Fan AC Motor - 355mm

Up to 4212 m³/h
355mm connection
AC motor

In stock

Next day delivery available

£1,172.23

Systemair Prio Silent XP 250EC circular duct fan with EC motor, 250mm diameter for efficient ventilation.

Systemair Prio Silent XP 250EC circular duct fan with EC motor, 250mm diameter for efficient ventilation.

Product data sheet

In stock

Next day delivery
available

Systemair

SKU: 231067

Systemair Prio Silent XP 250EC Circular Duct Fan EC Motor - 250mm

1 Phase
EC Motor
Up to 1787 m³/h
Speed Controllable

In stock

Next day delivery available

£1,207.79

Systemair Prio 400 Circular Duct AC Motor - eFans Direct Ltd

Systemair Prio 400 Circular Duct AC Motor - eFans Direct Ltd

Product data sheet

In stock

Next day delivery
available

Systemair

Systemair Prio 400 Circular Duct AC Motor - 400mm

Up to 4424 m³/h
400mm connection
AC motor

In stock

Next day delivery available

£1,209.99

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