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Roof Fans

63 products

Roof fans mount on a kerb or upstand and discharge straight to atmosphere at roof level, with no ductwork on the discharge side, which keeps installation cost and system resistance down. They are the standard answer on warehouses, factories, retail units and commercial kitchens, and anywhere there is no suitable external wall to extract through. We stock roof fans from Systemair, S&P, Elta and Vent-Axia from 150mm to 710mm, in single and three phase, on UK stock with next-day delivery. Use the buttons below to filter by supply, or for quotes and sizing help, email hello@efans.co.uk or call 0161 399 3825.

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Frequently asked questions

Vertical or horizontal discharge roof fan?

Vertical discharge fans exhaust air straight up. They are the most common type and work well in most applications, but near air intakes on taller neighbouring buildings the exhaust plume can rise and be drawn back in. Horizontal discharge fans, sometimes called mushroom fans, throw the air outwards and downwards so it disperses more quickly. They are the better choice near building boundaries, where vertical discharge could be re-entrained, or where planning limits visible roof equipment.

What should I check before ordering a roof fan?

A roof fan has to match its roof kerb, the base that sits on the roof and keeps the opening weatherproof, so check the kerb dimensions against your existing or planned opening. Check the supply at roof level too: single phase suits the smaller sizes, and most larger units are three phase. For kitchen extract, the fan must be rated for grease-laden air and elevated temperatures. A standard roof fan on a kitchen extract is a fire risk, so see our commercial kitchen extractor fans instead.

How do I size a roof fan?

Size from the airflow the space needs and the resistance on the inlet side: any ductwork, grilles or filters feeding the fan. For large buildings, several smaller roof fans spread across the roof often give more even extract than one large unit, and keep some ventilation running if one unit is out of service. Send us the building dimensions and the duty and we will size it.

Single phase or three phase?

Smaller roof fans are usually single phase and run from a standard 230V supply. Larger units are mostly three phase. Use the buttons below to filter the range by supply, and check what is available at roof level before choosing, because running a new three phase supply to the roof adds cost.

Can a roof fan be speed controlled?

Most can, with a controller matched to the fan motor and its full load current. Each product page lists the motor type and current. Tell us the fan and we will match a controller from our speed controllers.

Related ranges: All Axial Fans | Plate Axial Fans | Cased Axial Fans | Roof Cowls | Speed Controllers

Single Phase Three Phase

Showing 1 - 24 of 29 products

Systemair DHS DS roof fan with 3-phase motor, showing the industrial exhaust fan with mounting brackets and aerodynamic blades

Systemair DHS DS roof fan with 3-phase motor, showing the industrial exhaust fan with mounting brackets and aerodynamic blades

In stock

Next day delivery
available

Systemair

Systemair DHS DS Roof Fan AC 3 Phase Motor

3 Phase
AC Motor
Available in multiple sizes
Speed Controllable

In stock

Next day delivery available

From

£905.99

Systemair DHS Sileo 355 roof fan with three-phase motor, featuring a 355mm diameter for ventilation and exhaust applications.

Systemair DHS Sileo 355 roof fan with three-phase motor, featuring a 355mm diameter for ventilation and exhaust applications.

In stock

Next day delivery
available

Systemair

Systemair DHS Sileo 355 Roof Fan AC Three Phase - 355mm

3 Phase
AC Motor
Horizontal discharge
Speed Controllable

In stock

Next day delivery available

£905.99

Systemair DHS 400DS Sileo roof fan with a 400mm diameter, three-phase motor, designed for ventilation and exhaust applications.

Systemair DHS 400DS Sileo roof fan with a 400mm diameter, three-phase motor, designed for ventilation and exhaust applications.

Product data sheet

In stock

Next day delivery
available

Systemair

Systemair DHS 400DS Sileo Roof Fan 3 Phase - 400mm

3 Phase
AC Motor
Up to 2617 m³/h
Speed Controllable

In stock

Next day delivery available

£963.99

Systemair DHS Sileo 400 roof fan for AC ventilation, featuring a 400mm diameter fan with three-phase motor installation.

Systemair DHS Sileo 400 roof fan for AC ventilation, featuring a 400mm diameter fan with three-phase motor installation.

Product data sheet

In stock

Next day delivery
available

Systemair

Systemair DHS Sileo 400 Roof Fan AC Three Phase - 400mm

3 Phase
AC Motor
Up to 2617 m³/h
Speed Controllable

In stock

Next day delivery available

£964.69

S&P CRHT/4-315 roof mounted fan with a 315mm diameter, designed for ventilation on rooftops, shown mounted on a building.

S&P CRHT/4-315 roof mounted fan with a 315mm diameter, designed for ventilation on rooftops, shown mounted on a building.

Product data sheet

In stock

Next day delivery
available

S&P

SKU: 5136913900

S&P CRHT/4-355 Roof Mounted Fan - 355mm

3 Phase
AC Motor
Up to 3190 m³/h
Speed Controllable

In stock

Next day delivery available

£1,075.99

Systemair DHS Sileo 450 roof fan with 450mm diameter, three-phase AC ventilation fan for commercial or industrial use.

Systemair DHS Sileo 450 roof fan with 450mm diameter, three-phase AC ventilation fan for commercial or industrial use.

Product data sheet

In stock

Next day delivery
available

Systemair

SKU: 276525

Systemair DHS Sileo 450 Roof Fan AC Three Phase - 450mm

3 Phase
AC Motor
Up to 5998 m³/h
Speed Controllable

In stock

Next day delivery available

£1,099.99

Elta Clearflow CF350 roof fan with three-phase AC motor, 350mm diameter, mounted on a roof for ventilation.

Elta Clearflow CF350 roof fan with three-phase AC motor, 350mm diameter, mounted on a roof for ventilation.

Product data sheet

In stock

Next day delivery
available

Elta

SKU: CF350/4-3AC

Elta Clearflow CF350 Roof Fan Three Phase AC - 350mm

3 Phase
AC Motor
Up to 3730 m³/h
Speed Controllable

In stock

Next day delivery available

£1,126.39

Systemair DHS Sileo 500 roof fan with three-phase motor, 500mm diameter, designed for ventilation and exhaust applications

Systemair DHS Sileo 500 roof fan with three-phase motor, 500mm diameter, designed for ventilation and exhaust applications

Product data sheet

In stock

Next day delivery
available

Systemair

Systemair DHS Sileo 500 Roof Fan AC Three Phase - 500mm

3 Phase
AC Motor
Up to 5030 m³/h
Speed Controllable

In stock

Next day delivery available

£1,211.09

S&P CRHT/4-315 roof mounted fan with a 315mm diameter, designed for ventilation on rooftops, shown mounted on a building.

S&P CRHT/4-315 roof mounted fan with a 315mm diameter, designed for ventilation on rooftops, shown mounted on a building.

Product data sheet

In stock

Next day delivery
available

S&P

SKU: 5136917200

S&P CRHT/4-400 Roof Mounted Fan - 400mm

3 Phase
AC Motor
Up to 4630 m³/h
Speed Controllable

In stock

Next day delivery available

£1,265.99

Systemair DHS 500DS Sileo roof fan with 500mm diameter, three-phase industrial ventilation fan visible in the image.

Systemair DHS 500DS Sileo roof fan with 500mm diameter, three-phase industrial ventilation fan visible in the image.

Product data sheet

In stock

Next day delivery
available

Systemair

Systemair DHS 500DS Sileo Roof Fan 3 Phase - 500mm

3 Phase
AC Motor
Up to 5029 m³/h
Speed Controllable

In stock

Next day delivery available

£1,282.99

Elta Clearflow CF400 roof fan with three-phase AC motor, 400mm diameter, mounted for ventilation or exhaust purposes.

Elta Clearflow CF400 roof fan with three-phase AC motor, 400mm diameter, mounted for ventilation or exhaust purposes.

Product data sheet

In stock

Next day delivery
available

Elta

SKU: CF400/4-3AC

Elta Clearflow CF400 Roof Fan Three Phase AC - 400mm

3 Phase
AC Motor
Up to 4892 m³/h
Speed Controllable

In stock

Next day delivery available

£1,284.79

S&P CRHT/4-315 roof mounted fan with a 315mm diameter, designed for ventilation on rooftops, shown mounted on a building.

S&P CRHT/4-315 roof mounted fan with a 315mm diameter, designed for ventilation on rooftops, shown mounted on a building.

Product data sheet

In stock

Next day delivery
available

S&P

SKU: 5136918000

S&P CRHT/4-450 Roof Mounted Fan - 450mm

3 Phase
AC Motor
Up to 6180 m³/h
Speed Controllable

In stock

Next day delivery available

£1,305.99

Elta Clearflow CFHT350 roof fan, three-phase AC model, 350mm diameter, mounted on roof for ventilation and airflow.

Elta Clearflow CFHT350 roof fan, three-phase AC model, 350mm diameter, mounted on roof for ventilation and airflow.

Product data sheet

Out of stock

Contact us for an estimated delivery date

Elta

SKU: CFHT350/4-3AC

Elta Clearflow CFHT350 Roof Fan Three Phase AC - 350mm

3 Phase
AC Motor
Up to 2196 m³/h
Speed Controllable

Out of stock

Contact us for an estimated delivery date

£1,413.49

Elta Clearflow CFHT400 roof fan with three-phase AC motor, 400mm diameter, mounted on a building roof for ventilation.

Elta Clearflow CFHT400 roof fan with three-phase AC motor, 400mm diameter, mounted on a building roof for ventilation.

Product data sheet

In stock

Next day delivery
available

Elta

SKU: CFHT400/4-3AC

Elta Clearflow CFHT400 Roof Fan Three Phase AC - 400mm

3 Phase
AC Motor
Up to 2912 m³/h
Speed Controllable

In stock

Next day delivery available

£1,440.99

Systemair DHS Sileo 560 Roof Fan AC three-phase, 560mm diameter, industrial ventilation fan visible in the image.

Systemair DHS Sileo 560 Roof Fan AC three-phase, 560mm diameter, industrial ventilation fan visible in the image.

Product data sheet

In stock

Next day delivery
available

Systemair

Systemair DHS Sileo 560 Roof Fan AC Three Phase - 560mm

3 Phase
AC Motor
Up to 7993 m³/h
Speed Controllable

In stock

Next day delivery available

£1,737.99

Systemair DHS 560DS Sileo roof fan, 3-phase, 560mm diameter, mounted on roof for ventilation and exhaust.

Systemair DHS 560DS Sileo roof fan, 3-phase, 560mm diameter, mounted on roof for ventilation and exhaust.

Product data sheet

In stock

Next day delivery
available

Systemair

Systemair DHS 560DS Sileo Roof Fan 3 Phase - 560mm

3 Phase
AC Motor
Up to 8039 m³/h
Speed Controllable

In stock

Next day delivery available

£1,833.99

Elta Clearflow CFHT450 roof fan with three-phase AC motor, 450mm diameter, mounted on a roof for ventilation.

Elta Clearflow CFHT450 roof fan with three-phase AC motor, 450mm diameter, mounted on a roof for ventilation.

Product data sheet

In stock

Next day delivery
available

Elta

SKU: CFHT450/4-3AC

Elta Clearflow CFHT450 Roof Fan Three Phase AC - 450mm

3 Phase
AC Motor
Up to 4950 m³/h
Speed Controllable

In stock

Next day delivery available

£1,864.49

Elta Clearflow CF450 roof fan with three-phase AC motor, 450mm diameter, mounted for ventilation and air circulation.

Elta Clearflow CF450 roof fan with three-phase AC motor, 450mm diameter, mounted for ventilation and air circulation.

Product data sheet

In stock

Next day delivery
available

Elta

SKU: CF450/4-3AC

Elta Clearflow CF450 Roof Fan Three Phase AC - 450mm

3 Phase
AC Motor
Up to 7844 m³/h
Speed Controllable

In stock

Next day delivery available

£1,873.29

Elta Clearflow CFHT500 three-phase AC roof fan with a 500mm diameter, mounted on a building roof for ventilation.

Elta Clearflow CFHT500 three-phase AC roof fan with a 500mm diameter, mounted on a building roof for ventilation.

Product data sheet

In stock

Next day delivery
available

Elta

SKU: CFHT500/4-3AC

Elta Clearflow CFHT500 Roof Fan Three Phase AC - 500mm

3 Phase
AC Motor
Up to 6790 m³/h
Speed Controllable

In stock

Next day delivery available

£2,022.89

Elta Clearflow CF500 roof fan with three-phase AC motor, 500mm diameter, mounted on a roof for ventilation.

Elta Clearflow CF500 roof fan with three-phase AC motor, 500mm diameter, mounted on a roof for ventilation.

Product data sheet

In stock

Next day delivery
available

Elta

SKU: CF500/4-3AC

Elta Clearflow CF500 Roof Fan Three Phase AC - 500mm

3 Phase
AC Motor
Up to 9576 m³/h
Speed Controllable

In stock

Next day delivery available

£2,037.19

Systemair DHS Sileo 630 roof fan with three-phase motor, 630mm diameter for industrial ventilation.

Systemair DHS Sileo 630 roof fan with three-phase motor, 630mm diameter for industrial ventilation.

Product data sheet

In stock

Next day delivery
available

Systemair

Systemair DHS Sileo 630 Roof Fan AC Three Phase - 630mm

3 Phase
AC Motor
Up to 9950 m³/h
Speed Controllable

In stock

Next day delivery available

£2,154.89

Systemair DHS 630DS Sileo roof fan with 630mm diameter, three-phase motor, designed for ventilation and exhaust applications.

Systemair DHS 630DS Sileo roof fan with 630mm diameter, three-phase motor, designed for ventilation and exhaust applications.

Product data sheet

In stock

Next day delivery
available

Systemair

Systemair DHS 630DS Sileo Roof Fan 3 Phase - 630mm

3 Phase
AC Motor
Up to 9950 m³/h
Speed Controllable

In stock

Next day delivery available

£2,191.99

S&P CRHT/4-315 roof mounted fan with a 315mm diameter, designed for ventilation on rooftops, shown mounted on a building.

S&P CRHT/4-315 roof mounted fan with a 315mm diameter, designed for ventilation on rooftops, shown mounted on a building.

Product data sheet

In stock

Next day delivery
available

S&P

SKU: 5136979400

S&P CRHT/4-500 Roof Mounted Fan - 500mm

3 Phase
AC Motor
Up to 8680 m³/h
Speed Controllable

In stock

Next day delivery available

£2,406.99

Vent-Axia EuroSeries ESR71034 roof fan with three-phase motor, 710mm diameter, designed for efficient ventilation systems.

Vent-Axia EuroSeries ESR71034 roof fan with three-phase motor, 710mm diameter, designed for efficient ventilation systems.

Product data sheet

In stock

Next day delivery
available

vent-axia

SKU: ESR71034

Vent Axia EuroSeries ESR71034 Roof Fan Three Phase - 710mm

3 Phase
AC Motor
Up to 21960 m³/h
Speed Controllable

In stock

Next day delivery available

£2,476.99

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