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Inline centrifugal fan with the air flow up to 985 m³/h in steel casing.

  • Description
  • Characteristics
  • Capacity diagram
  • Downloads
  • Dimensions
  • Additional characteristics
  • Designation key
  • Supply and exhaust ventilation systems for commercial, office and other public or industrial premises.
  • EC motors applied in VKM fans reduce energy demand by about 35 % and ensure high aerodynamic performance and low noise level.
  • Such characteristics are of special importance for ventilation of public premises as banks, supermarkets, restaurants, hotels, installation close to residential buildings and for domestic application, e.g. ventilation of private pools.
  • EC motors enable integration of several fans into a unified networks and their centralized control.
  • The steel casing ensures reliable operation of the fan in case of its outside installation.
  • The fans are designed for connection to Ø 100, 125, 150, 160, 200, 250, 315, 355 and 400 mm air ducts.
  • The fan casing is made of polymer coated steel.
  • New technologies for manufacture of the fan components let attain the total casing air tightness.
  • The impellers with backward curved blades are powered with a high efficient electronically commutated (EC) direct current motor with external rotor.
  • As of today, such motor type is the most advanced solution for energy saving.
  • EC motors are featured by high performance and the best speed controllable range.
  • Premium efficiency reaching up to 90 % is the absolute advantage of electronically commutated motors.
  • The motors are equipped with ball bearings for longer service life of the fan (40 000 hours).
  • For precise features, safe operation and low noise, each turbine is dynamically balanced while assembly.
  • Motor ingress protection rating IP44.
  • The fan is controlled with the external control signal 0-10 V (air flow control as a function of temperature, pressure, smoke conditions and other parameters).
  • Should the control value get changed, the EC motor adjusts its speed and the fan boosts as much air flow to the ventilation system as required.
  • Maximum speed of the fan does not depend on the current frequency and it can operate at 50 or 60 Hz mains supply.
  • The fans may be integrated into the unified dispatch system.
  • The respective software enables to control all the fan integrated into the system.
  • The computer displays all the system parameters.
  • Each fan in the system may be individually adjusted.
  • The fans may be installed at any angle.
  • The fixing brackets that are included into the delivery set are used to facilitate the fan mounting to the wall.
  • The fan is connected to power mains through the external terminal box.
Parameter VKM 250 EC Q
Measurement unit
Low-powered motor yes -
High-power version no -
Phase 1 ˜
Voltage 230 V
Frequency 50/60 Hz
Sound pressure level at 3 m distance 44 dBА
Air capacity 985 m³/h
Power consumption 100 W
Current 0.74 A
RPM 2500 min-1
Max. transported air temperature -25 +60 °С
Protection rating IP X4 -
Duct diameter 250 mm
EC motor yes -
Weight 5.1 kg
Design centrifugal -
Casing material polymer coated steel -
Outdoor mounting yes -
SEC Class B -
Duct for round air ducts -
Type supply and exhaust -
Mounting outdoor mounting, Inline -
Capacity diagram
Capacity diagram
  • Selection method:
  • Air flow:
  • Pressure:
Operating point
  • Air flow: --
  • Pressure: ---
Files archieve
Select document type
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  • Certificates
  • Technical documentation
"VENTS VKM EC" user's manual 02-2023 (V88EN-07) (pdf 2.32Mb)
"VENTS VKM EC" product description 05-2022 (pdf 2.05Mb)
Download image "VENTS VKM EC (ErP 2018)" for your website (png 418.74Kb)
Download high quality image "VENTS VKM EC (ErP 2018)" (psd 3.25Mb)
Download image "VENTS VKM(S) 315-355-400 EC (ErP 2018)" for your website (png 410.73Kb)
Download high quality image "VENTS VKM(S) 315-355-400 EC (ErP 2018)" (psd 2.33Mb)
Parameter Value Measurement unit
∅D 248 mm
ØD1 345 mm
B 395 mm
B1 355 mm
H 435 mm
L 250 mm
L1 25 mm
L2 30 mm
L3 40 mm
Additional characteristics
Additional characteristics
Sound-power level, A - weighted Octave-frequency band [Hz] LpA, 3 m [dBА] LpA, 1 m [dBА]
  Hz Gen. 63 125 250 500 1000 2000 4000 8000
LwA to inlet dBА 88 60 76 83 81 83 79 85 63 68 78
LwA to outlet dBА 87 63 75 72 81 82 81 76 62 67 77
LwA to environment dBА 65 28 46 55 58 61 57 49 36 44 54
Designation key
Designation key
Series Air duct diameter [mm] Motor Options
VENTS VKMS: high-power version
100; 125; 150; 160;
200; 250; 315; 355; 400
ЕС: electronically commutated synchronous motor Un: speed controller with an electronic thermostat and a temperature sensor fixed on a 4-meter cable. Temperature-based operation logic.
U2n: speed controller with an electronic thermostat and a temperature sensor fixed on a 4-meter cable. Temperature-based switching on/off.
R1: power cord with a mains plug.
P: integrated smooth speed controller.
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Basic parameter for domestic fan selection