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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 34 products

S&P TH-500/150 Mixvent roof-mounted fan with 150mm diameter, installed on building roof for ventilation.

S&P TH-500/150 Mixvent roof-mounted fan with 150mm diameter, installed on building roof for ventilation.

Product data sheet

In stock

Next day delivery
available

S&P

SKU: 5220005200

S&P TH-500/160 MIXVENT Roof Mounted Fan - 160mm

1 Phase
AC Motor
Up to 500 m³/h
Speed Controllable

In stock

Next day delivery available

£354.99

S&P TH-500/150 Mixvent roof-mounted fan with 150mm diameter, installed on building roof for ventilation.

S&P TH-500/150 Mixvent roof-mounted fan with 150mm diameter, installed on building roof for ventilation.

Product data sheet

In stock

Next day delivery
available

S&P

SKU: 5220004500

S&P TH-500/150 MIXVENT Roof Mounted Fan - 150mm

1 Phase
AC Motor
Up to 500 m³/h
Speed Controllable

In stock

Next day delivery available

£364.99

Systemair DHS Sileo 225EZ roof fan with 225mm diameter, single-phase AC ventilation fan for roof installation.

Systemair DHS Sileo 225EZ roof fan with 225mm diameter, single-phase AC ventilation fan for roof installation.

Product data sheet

In stock

Next day delivery
available

Systemair

SKU: 189968

Systemair DHS Sileo 225EZ Roof Fan AC Single Phase - 225mm

1 Phase
AC Motor
Up to 850 m³/h
Speed Controllable

In stock

Next day delivery available

£383.99

S&P TH-500/150 Mixvent roof-mounted fan with 150mm diameter, installed on building roof for ventilation.

S&P TH-500/150 Mixvent roof-mounted fan with 150mm diameter, installed on building roof for ventilation.

Product data sheet

In stock

Next day delivery
available

S&P

SKU: 5220007900

S&P TH-800N MIXVENT Roof Mounted Fan - 200mm

1 Phase
AC Motor
Up to 720 m³/h
Speed Controllable

In stock

Next day delivery available

£449.99

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: 5136911500

S&P CRHB/4-225 N Roof Mounted Fan - 225mm

1 Phase
AC Motor
Up to 600 m³/h
Speed Controllable

In stock

Next day delivery available

£564.99

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: 5136911600

S&P CRVB/4-225N Roof Mounted Fan - 225mm

1 Phase
AC Motor
Up to 570 m³/h
Speed Controllable

In stock

Next day delivery available

£569.99

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: 5136911900

S&P CRHB/4-250 N Roof Mounted Fan - 250mm

1 Phase
AC Motor
Up to 740 m³/h
Speed Controllable

In stock

Next day delivery available

£580.30

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: 5136912100

S&P CRHB/4-280 N Roof Mounted Fan - 280mm

1 Phase
AC Motor
Up to 1530 m³/h
Speed Controllable

In stock

Next day delivery available

£609.99

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: 5136912000

S&P CRVB/4-250N Roof Mounted Fan - 250mm

1 Phase
AC Motor
Up to 690 m³/h
Speed Controllable

In stock

Next day delivery available

£650.99

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: 5136912600

S&P CRVB/4-315N Roof Mounted Fan - 315mm

1 Phase
AC Motor
Up to 2050 m³/h
Speed Controllable

In stock

Next day delivery available

£682.99

Systemair DHS Sileo 310EV roof fan, 310mm AC single-phase roof fan for ventilation systems, shown installed on roof.

Systemair DHS Sileo 310EV roof fan, 310mm AC single-phase roof fan for ventilation systems, shown installed on roof.

Product data sheet

In stock

Next day delivery
available

Systemair

Systemair DHS Sileo 310EV Roof Fan AC Single Phase - 310mm

1 Phase
AC Motor
Up to 1462 m³/h
Speed Controllable

In stock

Next day delivery available

£718.99

Systemair DHS Sileo 311EV roof fan with 311mm diameter, single-phase AC ventilation fan for roof installation.

Systemair DHS Sileo 311EV roof fan with 311mm diameter, single-phase AC ventilation fan for roof installation.

Product data sheet

In stock

Next day delivery
available

Systemair

SKU: 246991

Systemair DHS Sileo 311EV Roof Fan AC Single Phase - 311mm

1 Phase
AC Motor
Up to 1739 m³/h
Speed Controllable

In stock

Next day delivery available

£740.99

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: 5136912200

S&P CRVB/4-280N Roof Mounted Fan - 280mm

1 Phase
AC Motor
Up to 1350 m³/h
Speed Controllable

In stock

Next day delivery available

£787.99

S&P TH-500/150 Mixvent roof-mounted fan with 150mm diameter, installed on building roof for ventilation.

S&P TH-500/150 Mixvent roof-mounted fan with 150mm diameter, installed on building roof for ventilation.

Product data sheet

In stock

Next day delivery
available

S&P

SKU: 5220003700

S&P TH-2000 MIXVENT Roof Mounted Fan - 315mm

1 Phase
AC Motor
Up to 1570 m³/h
Speed Controllable

In stock

Next day delivery available

£811.99

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: 5136912500

S&P CRHB/4-315 N Roof Mounted Fan - 315mm

1 Phase
AC Motor
Up to 2110 m³/h
Speed Controllable

In stock

Next day delivery available

£967.99

Systemair DHS Sileo 400E4 roof fan with 400mm diameter, single-phase AC ventilation fan for roofs, weatherproof and efficient.

Systemair DHS Sileo 400E4 roof fan with 400mm diameter, single-phase AC ventilation fan for roofs, weatherproof and efficient.

Product data sheet

In stock

Next day delivery
available

Systemair

Systemair DHS Sileo 400E4 Roof Fan AC Single Phase - 400mm

1 Phase
AC Motor
Up to 4273 m³/h
Speed Controllable

In stock

Next day delivery available

£996.99

Systemair DHS Sileo 355E4 roof fan with 355mm diameter, single-phase AC ventilation unit for roof installation.

Systemair DHS Sileo 355E4 roof fan with 355mm diameter, single-phase AC ventilation unit for roof installation.

Product data sheet

In stock

Next day delivery
available

Systemair

Systemair DHS Sileo 355E4 Roof Fan AC Single Phase - 355mm

1 Phase
AC Motor
Up to 3139 m³/h
Speed Controllable

In stock

Next day delivery available

£998.79

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: 5136916800

S&P CRHB/4-400 N Roof Mounted Fan - 400mm

1 Phase
AC Motor
Up to 4540 m³/h
Speed Controllable

In stock

Next day delivery available

£1,026.99

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: 5136913500

S&P CRHB/4-355 N Roof Mounted Fan - 355mm

1 Phase
AC Motor
Up to 3090 m³/h
Speed Controllable

In stock

Next day delivery available

£1,037.99

Elta Clearflow CF315 roof fan, single phase AC, 315mm diameter, mounted on roof for ventilation.

Elta Clearflow CF315 roof fan, single phase AC, 315mm diameter, mounted on roof for ventilation.

Product data sheet

In stock

Next day delivery
available

Elta

SKU: CF315/4-1AC

Elta Clearflow CF315 Roof Fan Single Phase AC - 315mm

1 Phase
AC Motor
Up to 1987 m³/h
Speed Controllable

In stock

Next day delivery available

£1,070.29

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

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

Product data sheet

In stock

Next day delivery
available

Elta

SKU: CF350/4-1AC

Elta Clearflow CF350 Roof Fan Single Phase AC - 350mm

1 Phase
AC Motor
Up to 3665 m³/h
Speed Controllable

In stock

Next day delivery available

£1,125.29

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: 5136913600

S&P CRVB/4-355N Roof Mounted Fan - 355mm

1 Phase
AC Motor
Up to 2960 m³/h
Speed Controllable

In stock

Next day delivery available

£1,164.99

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: 5136916900

S&P CRVB/4-400N Roof Mounted Fan - 400mm

1 Phase
AC Motor
Up to 4530 m³/h
Speed Controllable

In stock

Next day delivery available

£1,172.99

Systemair DHS Sileo 400E6 roof fan, 400mm single-phase AC ventilation fan installed on roof with protective grille

Systemair DHS Sileo 400E6 roof fan, 400mm single-phase AC ventilation fan installed on roof with protective grille

Product data sheet

In stock

Next day delivery
available

Systemair

Systemair DHS Sileo 400E6 Roof Fan AC Single Phase - 400mm

1 Phase
AC Motor
Up to 2419 m³/h
Speed Controllable

In stock

Next day delivery available

£1,189.09

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