EKN(S), DKN(S) Duct Fans


  • easy installation via 20 mm standard flange
  • fans can be installed in any position
  • 100% speed controllable by auto
    transformer or electronic controller
  • motor protection by thermal contacts as standard
    (Explosion-proof motors with PTC thermistors)
  • extremely low starting currents
  • compact design

Design features

Duct fans combine the advantages of axial fans, straight airflow and easy installation, with those of centrifugal fans, such as high pressure stability, low noise level and high efficiency.


  • EKN, DKN - Casing made of galvanised sheet steel formed as a rectangular air duct, with standard tube flanges (20 mm width) at inlet and outlet sides.
  • EKNS, DKNS - aluminium profile and plastic corners made from reinforced polyamide. Panels are made from galvanised sheet steel with sound absorbing insulation made of clad fibre glass.


Forward-curved centrifugal impellers made of sheet steel or plastic. The impellers are fitted directly onto the rotor of the external rotor motor. The motorized impellers are balanced at two levels according to G 2.5 (DIN ISO 1940).

Electrical connection

The motors are wired to an external terminal box.