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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 49 - 63 of 63 products

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 CF450 roof fan with 450mm blade, single-phase AC motor, mounted on roof for ventilation.

Elta Clearflow CF450 roof fan with 450mm blade, single-phase AC motor, mounted on roof for ventilation.

Product data sheet

Out of stock

Contact us for an estimated delivery date

Elta

SKU: CF450/4-1AC

Elta Clearflow CF450 Roof Fan Single Phase AC - 450mm

1 Phase
AC Motor
Up to 7366 m³/h
Speed Controllable

Out of stock

Contact us for an estimated delivery date

£1,889.79

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

Roof-mounted S&P CRHB/4-225 N fan, 225mm diameter, designed for ventilation on rooftops, with a sturdy metal casing.

Roof-mounted S&P CRHB/4-225 N fan, 225mm diameter, designed for ventilation on rooftops, with a sturdy metal casing.

Product data sheet

In stock

Next day delivery
available

S&P

SKU: 5136979000

S&P CRHB/4-500 N Roof Mounted Fan - 500mm

1 Phase
AC Motor
Up to 8770 m³/h
Speed Controllable

In stock

Next day delivery available

£2,375.99

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

Roof-mounted S&P CRVB/4-225N fan, 225mm size, with blades and mounting frame visible on a roof vent installation.

Roof-mounted S&P CRVB/4-225N fan, 225mm size, with blades and mounting frame visible on a roof vent installation.

Product data sheet

In stock

Next day delivery
available

S&P

SKU: 5136979100

S&P CRVB/4-500N Roof Mounted Fan - 500mm

1 Phase
AC Motor
Up to 8550 m³/h
Speed Controllable

In stock

Next day delivery available

£2,534.99

Elta Clearflow CFHT560 roof fan with three-phase AC motor, 560mm diameter, mounted on a building roof for ventilation.

Elta Clearflow CFHT560 roof fan with three-phase AC motor, 560mm diameter, mounted on a building roof for ventilation.

Product data sheet

Out of stock

Contact us for an estimated delivery date

Elta

SKU: CFHT560/4-3AC

Elta Clearflow CFHT560 Roof Fan Three Phase AC - 560mm

3 Phase
AC Motor
Up to 9526 m³/h
Speed Controllable

Out of stock

Contact us for an estimated delivery date

£2,606.99

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: 5136980000

S&P CRHT/4-560 Roof Mounted Fan - 560mm

3 Phase
AC Motor
Up to 13220 m³/h
Speed Controllable

In stock

Next day delivery available

£2,680.99

Elta Clearflow CFHT630 roof fan with three-phase AC motor, 630mm diameter, installed on a building roof for ventilation.

Elta Clearflow CFHT630 roof fan with three-phase AC motor, 630mm diameter, installed on a building roof for ventilation.

Product data sheet

Out of stock

Contact us for an estimated delivery date

Elta

SKU: CFHT630/4-3AC

Elta Clearflow CFHT630 Roof Fan Three Phase AC - 630mm

3 Phase
AC Motor
Up to 13748 m³/h
Speed Controllable

Out of stock

Contact us for an estimated delivery date

£2,702.69

Systemair DHS Sileo 710 roof fan with three-phase AC motor, 710mm diameter, designed for ventilation and exhaust applications.

Systemair DHS Sileo 710 roof fan with three-phase AC motor, 710mm diameter, designed for ventilation and exhaust applications.

Product data sheet

In stock

Next day delivery
available

Systemair

Systemair DHS Sileo 710 Roof Fan AC Three Phase - 710mm

3 Phase
AC Motor
Up to 14764 m³/h
Speed Controllable

In stock

Next day delivery available

£3,170.19

Systemair DHS 710DS roof fan with 710mm diameter, three-phase industrial ventilation fan for commercial roofing applications.

Systemair DHS 710DS roof fan with 710mm diameter, three-phase industrial ventilation fan for commercial roofing applications.

Product data sheet

In stock

Next day delivery
available

Systemair

Systemair DHS 710DS Roof Fan 3 Phase - 710mm

3 Phase
AC Motor
Up to 14764 m³/h
Speed Controllable

In stock

Next day delivery available

£3,171.99

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