Roof-mounted smoke extraction fans with centrifugal impellers are designed for the removal of smoke, hot gases, and heat from buildings during fire incidents. These units support firefighting and rescue operations and enhance the safety of occupants and property in all types of buildings.

They also help prevent the spread of smoke and fire to unaffected zones. REF fans can additionally be used as exhaust fans in general/purpose or mixed ventilation systems.

Impeller

• Unidirectional centrifugal impeller (balanced to class G 6.3)
• Made of sheet steel with a cast iron hub

Motor

• Mounted inside the housing on a support structure
• Cooled by external air via an insulated cooling duct
• Asynchronous motor
• Motor enclosure protection class: IP55
• Insulation class: F
• Single-speed, three-phase motors [230/400V (Y) or 400/690V (D/Y)]
• Double-speed, three-phase motors [400/400V (Y/YY)]
• Rated power: 0.18–22 kW
• Rotational speed: 750–3000 rpm
• Efficiency class: IE3

Housing

• Diameter range: DNØ315 – 800 mm
• Octagonal shape, made of aluminium sheet
• Equipped with an insulated motor cooling duct
• External surfaces (housing, base, and cooling duct) powder-coated with polyester finish

Available Fan Types:

• With single-speed motor
• With double-speed motor