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Centrifugal roof fan with horizontal air exhaust and with maximum air flow of up to 820 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 galvanized steel (VENTS VKHz).
  • 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 VKHz 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 VKHz 4E 250
Measurement unit
Phase 1 ˜
Power 48 W
Voltage 230 V
A 0.23 A
Frequency 50 Hz
Air capacity 820 m³/h
RPM 1440 min-1
Noise level at 3 m 46 dBА
EC motor no -
Motor protection rating IP44 -
Transported air temperature -25 ... +50 °С
Design centrifugal -
IP Code IP X4 -
Number of poles 4 -
Mass 12.1 kg
Outdoor mounting yes -
SEC Class B -
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)
Declaration of сonformity "VKV, VKH" (pdf 1.68Mb)
"Roof fans accessories" product description 02-2016 (pdf 132.53Kb)
"VENTS VKV, VKH" user's manual 09-2022 (V204EN-02) (pdf 5.14Mb)
Download high quality image "VENTS VKHz (ErP 2018)" (psd 2.23Mb)
Download image "VENTS VKHz (ErP 2018)" for your website (png 396.75Kb)
Parameter Value Measurement unit
Ø D 285 mm
∅d 11 mm
A 451 mm
B 450 mm
C 330 mm
H 237 mm
H1 244 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 68 51 57 60 52 63 62 57 52 47 57
LwA to environment dBA 67 29 48 57 60 63 59 51 37 46 56
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

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