Privacy Policy (GDPR)
Not registered yet? Take advantages of registration:
Products saving in a binding to the projects
Product consultation from our experts - Online
By using this form, you confirm that you have read the site terms of use Terms of use and completely accept the terms of use


Centrifugal roof fan with horizontal air exhaust and with maximum air flow of up to 3 950 m³/h.

  • Description
  • Characteristics
  • Capacity diagram
  • Downloads
  • Dimensions
  • Additional characteristics
  • Designation key
  • BIM
  • Exhaust ventilation systems for commercial, office and other public or industrial premises for various premises suitable for roof mounting.
  • Compatible with Ø 200-630 mm air ducts.
  • Suitable for any roof types as well as vertical ventilation shafts.
  • 2-, 4- or 6-pole single- or three-phase asynchronous motors with an external rotor and impeller with backward curved blades.
  • 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.
  • Motors protection rating IP44, IP54.
  • 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 casing is made of steel with polymeric coating (VENTS VKH models).
  • 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 damper, GVK flexible connector, FKV counter flange.
  • For mounting of the fans to flat surface use the mounting frame RKV.

VKH fan store roof ventilation example

Parameter VKH 4E 400
Measurement unit
Phase 1 ˜
Power 457 W
Voltage 230 V
A 2.00 A
Frequency 50 Hz
Air capacity 3950 m³/h
RPM 1440 min-1
Noise level at 3 m 55 dBА
Motor protection rating IP54 -
EC motor no -
Design centrifugal -
Transported air temperature -30 … +60 °С
IP Code IP X4 -
Number of poles 4 -
Weight 35 kg
Outdoor mounting yes -
Sound-insulated casing no -
Type exhaust -
Mounting for roof -
Capacity diagram
Capacity diagram
  • Selection method:
  • Air flow:
  • Pressure:
Operating point
  • Air flow: --
  • Pressure: ---
Files archieve
Select document type
  • Advertising and printing products
  • Certificates
  • Technical documentation
"VENTS VKV, VKH" product description 03-2021 (pdf 2.06Mb)
Download high quality image "VENTS VKH (ErP 2018)" (psd 2.04Mb)
Declaration of сonformity "VKV, VKH" (pdf 1.68Mb)
"Roof fans accessories" product description 02-2016 (pdf 132.53Kb)
Download image "VENTS VKH (ErP 2018)" for your website (png 293.5Kb)
"VENTS VKV, VKH" user's manual 06-2023 (V204EN-02) (pdf 4.27Mb)
Parameter Value Measurement unit
Ø D 438 mm
∅d 11 mm
A 625 mm
B 620 mm
C 450 mm
H 376 mm
H1 415 mm
Additional characteristics
Additional characteristics
Sound power level A-weighted Gen. Octave-frequency band [Hz] LpA, 3 m dBA LpA, 1 m dBA
dBA 63 125 250 500 1000 2000 4000 8000
LwA to inlet dBA 75 46 47 55 67 70 70 68 57 54 64
LwA to environment dBA 76 38 46 59 70 71 71 63 47 55 65
Designation key
Designation key
Series and modification Casing material Motor modification Turbine standard size
Number of poles Phase
VENTS VKH: horizontal air exhaust _: steel with polymeric coating
А: aluminum
z: galvanized steel
Е: single-phase
D: three-phase
190; 220; 225; 250; 280; 310; 355; 400; 450; 500; 560; 630; 710

Accessories Similar products
Share your opinion

Basic parameter for domestic fan selection