Technical data

Technical data, VEX250

Air handling unit data
Min. airflow  720 m³/h
Max. airflow 3,730 m³/h
Power consumption 2.9 kW
Electrical Supply 3 x 400 V + N + PE ∼ 50 Hz
Max. phase current 11,2 A (Power consumption is taken from 2 phases and is not sine shaped)
Max. neutral current  15 A (dimensioned current)
Weight of operational air handling unit 273 kg
Weight of air handling unit for transport 195 kg (ex. lids and fan units)

Ambient temperature (operating)

At temperatures below -25˚C (with outdoor installation), use of a thermostatically controlled heater in automated control box is recommended.

-30°C to +50°C 

Rotor pinion - stepper motor:

Voltage 230 V
Phase current 0.2 A
Power consumption 45 W
Overcurrent protection Built in
Control (built in rotation monitor) Infinitely variable from 0 to 10 rpm on the rotor

Motor and motor control (MC) data
Motor type EC motor
Motor class in accordance with IEC TS 60034-30-2 IE5 (Ultra Premium Efficiency)
Voltage input 1 x 230 V
Current overload protection Built-in
Regulation Variable via motor control (MC)
Control signal with control system Modbus
Control signal with third party control system 0 - 10 V DC
Fluid temperature (air) -40°C....+40°C
Ambient temperature (operating) -30°C....+50°C 

Fan data

Max. total efficiency (A-D) 60.0 %
ECO measurement set-up (A-D) A
Efficiency level requirements 62N (2015)
ECO efficiency level during optimal operating point 74.4N


Motor data (optimal operating point)

EC motor With motor controller
Power consumption 1.25 kW
Airflow 3279m3/h
Total pressure 826 Pa
RPM during optimal operating point  2902



- Density = 1.2 kg/m3
- Pressure ratio < 1.11
- other points in acc. with EC327/2011 (see product instructions)

Temperature efficiency

Temperature efficiency, VEX250

VEX250 with standard rotor


VEX250 with highly efficient rotor

VEX250 High efficient rotor 


The temperature efficiency of the VEX units is shown at different airflow ratios, calculated as:

t2,1 = Temperature of outdoor air (fresh air)
t2,2 = Temperature of supply air
t1,1 = Temperature of extract air
Extract air = 25 ºC
Outdoor air (fresh air) = 5 ºC

Temperature efficiency is stated in compliance with EN308 for dry heat recovery and is increased by condensation.

Dimensional sketches

Dimensional sketches, VEX250

VEX250 - Fan location 1, here shown as LEFT

(air handling unit measurements in mm)

VEX250 - Fan location 2, here shown as LEFT

(air handling unit measurements in mm)

All measurements are excluding feet (12 mm) and base (adjustable from 105 - 135 mm).
1) Allow a distance for servicing in front of the unit that is equivalent to the depth of the air handling unit.
2) Allow a min. of 200 mm free height for service.

Cooling and heating coils

Cooling and heating coils, VEX250 

The following cooling and heating coils are suitable for VEX250

Type Model
HE electric heating coil  HCE250
HW water heating coil HW400
CW cooling coil (water)  CW400I
DX cooling/heating coil DX400U

Add all about the product series VEX250


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Vex overview

VEX Summary

Get a quick overview of our entire range of compact VEX air handling units with heat recovery.

View the VEX summary here