VKM 450 AC

Inline centrifugal fans in steel casing with air flow up to 6280 m³/h.
  • AC Motor
  • Speed-controllable
  • Backward-curved blades


  • Supply and exhaust ventilation systems for commercial, office and other public or industrial premises.
  • The steel casing provides reliable operation in case of outdoor installation.
  • For premises with high requirements to the noise level we suggest units in low-noise modification (VKM…Q).
  • The fan casing is made of steel with polymeric coating.
  • For easy connection and operation the power cord with a plug can be provided (VKM…R).
  • The impeller with backward curved blades is powered by the single phase motor with external rotor and overheating protection with automatic restart.
  • Some standard sizes are available is high-powered modifications (VKMS).
  •  The VKM…E models are equipped with energy-efficient motor with low energy demand.
  • The motor is equipped with ball bearings for long service life designed for at least 40 000 hours.
  • For precise features, safe operation and low noise, each turbine is dynamically balanced while assembly.
  • Motor protection rating IP 44.
  • Smooth or step speed control with a thyristor or autotransformer speed controller.
  • Several fans may be connected to one speed controller provided that the total power and operating current do not exceed the rated speed controller parameters.
  • The VKM…P models are equipped with a built-in speed controller (available for diameters 100…315).
  • Mounting to wall or ceiling at any angle is performed with fastening brackets supplied with the unit.
  • The fan is powered through the external terminal box.
  • Electric connection and installation shall be performed in compliance with the manual and wiring diagram on the terminal box.
  • The ideal solution for ventilation of the premises requiring permanent temperature control, i.e. greenhouses.
  • The fan with the electronic temperature and speed control module provides automatic control of the motor speed (air capacity) depending on air temperature in the air duct or in the room.
  • The front panel of the electronic module has the following control knobs:
    • speed control knob for setting the motor speed;
    • thermostat control knob for setting the temperature set point;
    • thermostat indicator light.
  • VKM…Un – the model with an external temperature sensor fixed on a 4 m cable (Un / U1n option).
  • The temperature sensor has mechanical protection.


Parameter VKM 450
50 Hz
VKM 450
60 Hz
Measurement unit
Phase 1 ˜
Voltage 230 V
Frequency 50 60 Hz
Sound pressure level at 3 m distance 65 73 dBА
Power consumption 665 1250 W
Maximum air capacity 5300 6280 m³/h
Current 2.89 5.4 A
RPM 1265 1560 min-1
Max. transported air temperature -40 +70 -25 +60 °С
Protection rating IP X4
Duct diameter 450 mm
Weight 27.26 kg
Design centrifugal
Casing material polymer coated steel
Duct for round air ducts
Type supply and exhaust
Mounting Inline

Additional characteristics

Sound-power level LpA, 3 m dBA LpA, 1 m dBA
Gen. Octave-frequency band [Hz]
Hz 63 125 250 500 1000 2000 4000 8000
LwA to inlet dBA 98 59 85 83 87 93 94 89 78 78 88
LwA to outlet dBA 98 63 76 87 84 92 95 88 80 78 88
LwA to environment dBA 86 37 60 70 79 81 81 70 61 65 75


Parameter Value Measurement unit
∅D 448 mm
B1 670 mm
ØD1 608 mm
B 700 mm
L 644 mm
L1 60 mm
L2 60 mm
L3 80 mm

14 schema Inline centrifugal fans in steel casing with air flow up to 6280 m³/h. AC Motor Speed-controllable Backward-curved blades

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