Mehrere Radialventilatoren auf dem Rollband in der Produktion von Okoluft

Centrifugal Fans

with forward and backward curved impellers for device installation in a wide range of applications

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Centrifugal fans for a wide range of applications

Okoluft provides a wide range of centrifugal fans. In addition to different housing designs, Okoluft radial fans are available in both single-sided and double-sided suction versions. The fans are also available with different drives. Energy-saving EC external rotor motors, conventional AC external rotor motors and IEC standard motors are used.

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Centrifugal fans with backward curved impellers

EC Centrifugal Fans ; backward curved

This series exclusively uses energy-efficient EC external rotor motors for the drive. The high-performance radial fans with backward curved blades have been specially developed for use in modern ventilation and air conditioning units and are suitable for conveying air with low dust content and slightly aggressive gases and vapours. The sizes correspond to the standard number series R20 according to DIN 323.


Type: EHAG

  • Volume flows up to 13,400 m³/h
  • Size: 225 – 560 mm (impeller diameter)
  • Highly efficient EC technology
  • Compact design

AC Centrifugal Fans ; backward curved

These centrifugal fans have been specially developed for use in modern ventilation and air handling units and are suitable for conveying air with low dust content and slightly aggressive gases and vapours. The sizes correspond to the standard number series R20 according to DIN 232.


Type: E/DHAE ; E/DHAD

  • Volume flows up to 28,000 m³/h
  • Size: 225 – 560 mm (impeller diameter)
  • Asynchronous external rotor motor
  • Protection class IP54

Centrifugal Fans with IEC standard motor ; backward curved

The high-performance centrifugal fans in the EHN.. series are suitable for conveying clean or low-dust air and slightly aggressive gases and vapours. They are not gas-tight. The permissible conveying medium temperature is between -30°C and 60°C.


Type: EHNE / EHND

  • Volume flows up to 21,000 m³/h
  • Size: 200 – 630 mm (impeller diameter)
  • Casing made of galvanised sheet steel
  • Casing position: LG or RD (according to Eurovent)

Centrifugal fans with forward curved impellers

Centrifugal fans ; forward curved

These centrifugal fans have been specially developed for use in modern ventilation and air handling units and are suitable for conveying air with low dust content and slightly aggressive gases and vapours. The sizes correspond to the standard number series R20 according to DIN 232.


Type: ERA.. / DRA…

  • Volume flows up to 15,000 m³/h
  • Size: 180 – 400 mm (impeller diameter)
  • Housing made of galvanised sheet steel
  • Asynchronous external rotor motor

Centrifugal fans with slip characteristics

By using specially designed external rotor motors with high rotor resistance in combination with forward-curved centrifugal impellers, we have developed a series of centrifugal fans with extremely high slip characteristics. The external rotor motor adapts its operating behaviour to the respective loads. This causes the speed to change depending on the total pressure. This is particularly advantageous when resistances change during operation, e.g. when filters become dirty, duct systems are switched on and off, and for clean room technology.


Type: ERA.. / DRA..

  • Volume flows up to 12,000 m³/h
  • Size: 249 – 399 mm (impeller diameter)
  • Steep volume-pressure characteristic curve
  • Extremely low starting current

Centrifugal fans with IEC standard motor ; forward curved

The high-performance ERN.. type centrifugal fans are suitable for conveying clean or low-dust air and slightly aggressive gases and vapours. They are not gas-tight. The permissible conveying medium temperature is between -30°C and 60°C.


Type: ERNE / ERND

  • Volume flows up to 11,000 m³/h
  • Size: 200 – 450 mm (impeller diameter)
  • Housing made of galvanised sheet steel
  • Housing position: LG or RD