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Axial roof fan VENTS VOK series

  • Description
  • Modifications
  • Capacity diagram
  • Downloads
  • Legend
  • Exhaust ventilation systems for commercial, office and other public or industrial premises for various premises for roof mounting.

  • Compatible with Ø 200 to 500 mm round air ducts.
  • The fan casing is made of steel with polymeric coating.

  • The impellers are powered with two- or four-pole, singlephase asynchronous motors with external rotor and built-in thermal overheating protection with automatic restart depending on the model.

  • Ball bearings in the motor ensure long service life.

  • Motor protection rating IP 24.

  • Both smooth or step speed control is performed by means of the thyristor or autotransformer controller.

  • Several fans can be connected to one controller under condition that the total power and operating current do not exceed the rated controller values.

  • The fan is mounted on the roof directly above the ventilating duct or shaft and is firmly fixed to the flat surface by means of a connecting plate.

  • While mounting VOK fans directly onto the flat roof a supporting block shall be provided to prevent water and snow drops into the vent of the ventilation shaft.

  • Electrical connection and installation shall be performed in compliance with the manual and circuit diagram on the terminal box.

Capacity diagram
Capacity diagram
  • Selection method:
  • Air flow:
  • Pressure:
Operating point
  • Air flow: --
  • Pressure: ---
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  • Technical documentation
"VKV, VKH, VKV EC, VKH EC, VKMK, VKMKp, VOK, VOK1" user's manual 01-2021 (V12EN-09) (pdf 1.96Mb)
"VENTS VOK" product description 03-2021 (pdf 647.26Kb)
Download high quality image "VENTS VOK (ErP 2018)" (psd 3.82Mb)
Declaration of сonformity "VOK, VOK1" (pdf 1.65Mb)
"Roof fans accessories" product description 02-2016 (pdf 132.53Kb)
Download image "VENTS VOK (ErP 2018)" for your website (png 263.3Kb)
Series Motor modification Impeller diameter
Number of poles Phase
VENTS VOK 2, 4 E: single phase 200; 250; 300; 350


ErP data  
Overall efficiency η, [%]
Measurement category MC
Efficiency category EC
Efficiency grade N
Variable speed drive VSD
Power [kW]
Current [A]
Air flow [m3/h]
Static pressure [Pa]
Speed [n/min-1]
Specific ratio SR
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