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  • Description
  • Characteristics
  • Downloads
  • Dimensions
  • Additional diagrams
  • Legend
  • Exhaust ventilation system for various premises suitable for roof mounting.

  • Compatible with Ø 200 to 500 mm air ducts.

  • Suitable for any roof types as well as vertical ventilation shafts.

  • The fan casing is made of steel with polymeric coating (VENTS VKH model), aluminum (VENTS VKHA), galvanized steel (VENTS VKHz).

  • 2-, 4- or 6-pole single or three phase asynchronous external rotor motor and impeller with backward curved blades installed on the motor shaft.

  • The motor is equipped with thermal overheating protection with automatic restart as well as ball bearings for long service life.

  • For precise features, safe operation and low noise, each turbine is dynamically balanced while assembly.

  • Motor protection rating IP 44.

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

  • Several fans can be connected to one controller in case 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 VKH 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 beperformed in compliance with the manual and circuit diagram on the terminal box.

  • For connection of the fans to round air ducts use the following accessories: KKV damperGVK flexible connectorFKV counter flange.

  • For mounting of the fans to flat surface use the mounting frame RKV.

VENTS VKH fan store roof ventilation example
Parameter VKH 4D 355
Measurement unit
Engine Type 380В / 50-60Гц -
Phase 3 ˜
Voltage 400 V
Frequency 50/60 Hz
Current A
Sound pressure level at 3 m distance 55 dBА
Pressure 0 Pa
Power consumption 235 W
RPM 1600 min-1
Maximum transported air temperature 70 °С
Protection rating IP X4 -
Weight 15.6 kg
Spigot size 355 mm
Number of poles 4 -
SEC Class - -
Files archieve
User's manual "VKV, VKH, VKV EC, VKH EC, VKMK, VKMKp, VOK, VOK1" (pdf 3.37Mb)
Brochure "VENTS VKV, VKH" (pdf 240.06Kb)
Download high quality image "VENTS VKH (ErP 2015, 2016, 2018)" (psd 4.02Mb)
Declaration of сonformity "VKV, VKH" (pdf 1.68Mb)
Brochure "Roof fans accessories" (pdf 129.67Kb)
Download image "VENTS VKH (ErP 2015, 2016, 2018)" for your website (png 369.43Kb)
VENTS   VKH 4D 355
Parameter Value Measurement unit
∅D 438 mm
∅d 12 mm
H 325 mm
L 598 mm
L1 450 mm
L2 550 mm
Additional diagrams
Additional diagrams
Sound-power level   Octave-frequency band [Hz]
  Hz   General   63   125   250   500   1000   2000   4000   8000
LwA to inlet   dBA 67 56 57 63 65 64 59 54 47
LwA to environment dBA 72 56 60 62 66 62 63 55 49

Series and modification   Casing material   Number of poles   Phase   Turbine standard size
VENTS VKH – horizontal air
  _ steel with polymeric coating
A –
z –
galvanized steel
  2, 4, 6   E- single phase;
D - three phases
  220; 225; 250; 280; 310; 355; 400; 450; 500
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Basic parameter for domestic fan selection