VEX330H Compact unit

VEX330H Compact unit

VEX330H Compact unit

One of the most compact air handling units with counter flow heat exchanger on the market. Optimised design in terms of temperature efficiency, airflow and energy consumption. Despite being very compact in size, ease of servicing is a key feature.

The VEX330H is ideal for residential ventilation, where the air is separated via the ventilation system, removing the risk of odours and humidly being transferred.



The side panels on both sides of VEX330H models can be removed (easy access). This allows the unit to function as both a LEFT and RIGHT version.

The unit can also be ordered as an outdoor model. The outdoor unit has a fitted cover that protects it against wind and weather.

Operating conditions

In principle, EXHAUSTO VEX units are designed for use in comfort ventilation - i.e. under ordinary operating conditions.

Where ventilation solutions are required for rooms with high air humidity - e.g. due to humidification, we recommend you make a test calculation with one of our calculation programs. If the calculation shows a risk of condensation after the heat exchanger, an assessment must be made whether the operating conditions can be changed, or whether the unit must be modified to allow condensate to drain off. This is particularly relevant for VEX100CF.

Contact EXHAUSTO for advice on this.

Unique frost protection

VEX330H Bypass de-icing

The VEX330H is designed with de-icing bypass. If there is a risk of icing, then a certain amount of outdoor air will bypass the heat exchanger and go directly to the after heating coil. This increases the demands on the after heating coil’s output. However, it avoids a costly preheating coil. The drawing below is an example of a de-icing situation, where 20% of outdoor air is directed through the bypass damper.


Heating coil and de-icing function:
The de-icing situation is shown above, a heating coil is included here. A coil is absolutely necessary, in order for the de-icing function to work correctly. Without the heating coil, the de-icing process will cause the temperature of the supply air to fall and sooner or later the VEX unit will stop because of icing.

The heat exchanger has two forms of frost protection: temperature-controlled or pressure-controlled. The actual de-icing can take place in several ways, depending on whether an after heating coil has been fitted.

Which method is used when?

Frost protection method De-icing starts when Recommended for use in
Temperature-controlled Temperature is below the set value,
e.g. tice < 0 °C
Residences, changing rooms, and
rooms with variable humidity in the winter.
Pressure-controlled Pressure across the heat exchanger exceeds the set value, e.g. + 45 % Offices, schools, after-school club facilities,
and rooms with low humidity in winter.



Temperature-controlled frost protection Tice

The control system has temperature-controlled frost protection as standard. It is an inexpensive solution and provides sufficient frost-protection in some situations.

A temperature sensor is fitted inside the heat exchanger and if the temperature falls to a pre-set value, de-icing begins. This temperature level is factory set to 0 °C but it can also be changed to a new value via the control system.

Temperature-controlled frost protection triggers the de-icing process even if there is no ice in the heat exchanger.

Pressure-controlled frost protection (requires accessories AFC and DEP)

The control system monitors the actual airflow and also the pressure drop across the heat exchanger. If ice forms in the heat exchanger, the pressure drop across the heat exchanger will increase and when it exceeds a pre-set value, de-icing begins.

Pressure-controlled frost protection only starts de-icing when ice has actually formed, regardless of whether there are sub-zero temperatures.

Capacity curves

Capacity, VEX330H

Below illustrates which capacity ranges individual VEX sizes cover. To calculate the actual capacity data, use our product selection programs.




The compact unit is designed in accordance with German hygiene standard VDI6022, which ensures units are accessible for service and the formation of mould or other bacteria that could  negatively impact air quality is prevented. Read more about this standard in the Certificates section.



Cabinets are made from Aluzinc® AZ185 class C4 in accordance with EN/ISO12944-2 and insulated with 50 mm mineral wool. This results in low noise emissions to the surrounding environment/installation room.

The panel design minimises the formation of thermal bridges in the unit.


Motor sections


VEX320330 ventilatorsektion

The motor sections are mounted in vibration dampers, which reduces noise in the ducts  and eliminates the need to fit flexible connections between the unit and the duct system.

The motors are of type EC and are extremely efficient. They comply with the requirements of the Ecodesign Directive.



Fan impeller


VEX320330 ventilatorhjul

VEX300H is equipped with an optimised centrifugal fan impeller with backwards curved vanes. The impeller design delivers high output with low energy consumption.  

AHUC - Main board 


VEX320330 connectionbox

The easily accessible  connection box with built-in switch disconnector ensures easy access for connecting and adjusting. 

Panel filters


Panel filters are easy to replace and can be ordered as Coarse 85% (M5) or ePM1 55% (F7) in acc. with EN779.

Filter size: 340 x 630 x 96 mm.


VEX300H Energy-efficient ventilation

The design of the unit has placed particular focus on smooth airflow through the unit in order to achieve the lowest possible pressure loss.

Counter flow heat exchanger


The VEX330 counter flow heat exchanger is made of aluminium. It is designed to ensure the ratio of heat recovery and pressure loss is at an optimum, i.e.
extremely high temperature efficiency is achieved at low levels of energy consumption.

- Efficiency level without condensation: 80–85 %
- Efficiency with condensation: Up to 94 %
- Heat transfer area: 30.3 m2
- Weight: qty. 1 à 14.5 kg

EC motors

VEX320330 ventilatorsektion The combination of modern EC motors  and an  optimised centrifugal impeller delivers extremely low energy consumption and greater output at the same time.

Energy labelling

An energy label that states the energy class of the unit in relation to defined operating conditions is available via our product calculation programs.



EXHAUSTO puts great emphasis on providing accurate data. So we use a third party to measure and check our data.

Eurovent certification

All data provided with the VEX100/VEX100CF/VEX200/VEX300 model has been measured.

The units have completed a major test programme in our development department and all of the capacity, efficiency and sound data is collected via testing and in real operating situations.

In accordance with EN1886 and EN13053, Eurovent has tested and certified that EXHAUSTO VEX units meet the following requirements and classes:
Unit’s stiffness:
Air tightness class at -400 Pa:
Air tightness class at +700 Pa:
Filter bypass leakage:
Insulation class:
Thermal bridge class:

L1 (M)
L1 (M)
T2 (M), U1≤1,0
TB3 (M)

This means that a third party has checked that the data that our product calculation program produces complies with the real performance of the unit. Eurovent checks the data by selecting a unit at random and testing that unit at their own facility. If our stated data complies with the Eurovent's test results, we retain our certification. This guarantees the customer that our data is valid.

VDI 6022 - German hygiene standard

EXHAUSTO has designed its units in accordance with the German hygiene standard VDI 6022.

VDI 6022 requirements
The unit's design must make cleaning easy. There may not be areas that cannot physically be cleaned and voids that are inaccessible must be sealed. Plates must be deburred to ensure edges are smooth and corners must be rounded to avoid the risk of injury when cleaning.

In addition,the condensation tray must decline to the outlet, so that water cannot remain in the unit. It is important that the condensation outlet is connected to the drainage system on a horizontal surface.

All non-metallic materials (e.g. seals, filters), are tested to show that they do not promote growth of mould spores and bacteria.

Because the unit is designed in accordance with VDI 6022, it is both more hygienic and easier to clean.


Ecodesign - EU requirements for documentation, energy consumption and labelling of ventilation units.



General information

We have made a compilation of extracts from the Ecodesign guidelines, read more about Ecodesigne here.


Ecodesign data

You will find links to Ecodesign data for the individual VEX sizes under the product name and in the Download section, where we have located Ecodesign data under EU/ECO declarations.


We would point out that the values stated in the declarations have been calculated for a specific operating point.

If a different operating point is desired, we refer to our calculation programs - here you can see whether the desired unit meets the requirements for your operating point and you will find the associated Ecodesign data.

Cooling and heating coils


The following cooling and heating coils are available with the VEX300H:

Water heating coils - HW

HCW rundekanaler 150 100

Uninsulated external water heating coils.

Three sizes available. The selection is dependent on after heating requirements and allows the option for the low temperature operation of the heating coil.

More information about HW heating coils is found under Cooling and heating coils.

Electric heating coils - HE

HCE runde kanaler

Uninsulated external electric heating coil.

Two sizes available. The selection is dependent on after heating requirements.

More information about the HE heating coils is found under Cooling and heating coils

Cooling coil/heating coil - DX


Uninsulated external coil that can be used both as an evaporator (cooling coil) and condenser (heating coil).

Two sizes available. 

More information about the DX coils is found under Cooling and heating coils 

SPLIT version

VEX330H is available as a split version.

With some projects, limited space means that internal transport of the air handling unit is difficult or impossible. This is why the VEX330H is available as a split version. It means that the air handling unit can be assembled and tested at the factory as normal – just without sealant. The air handling unit can therefore be easily taken apart at the installation site, transported as single sections, assembled, sealed and commissioned.

The table below shows the dimensions of the largest section (counterflow heat exchanger) and largest cabinet section, so that it can easily be determined whether there is sufficient space to allow internal transport.

Section Dimensions VEX330H
Counterflow heat exchanger height x length x depth [mm] 755 x 540 x 500
Weight [kg]
Biggest cabinet section Height x width x depth [mm]  1200 x 960 x 50
Motor section Weight [kg]  2 x 8”




A wide range of accessories are available with the VEX300H

Closing damper - LS 

LS runde kanaler 150 100 Closing damper with spring-return for indoor or outdoor fitting.



VEX330H sokkel A base with feet can be ordered.

Outdoor installation

VEX330H OD 150100

The cabinet is insulated with 50 mm mineral wool.

For outdoor installations, the unit is supplied with a cover that allows cables to be run under the cover on both sides, and at the back of the unit.

We recommend the outdoor unit is fitted with additional support as described in the instructions.


 Water trap

EXHAUSTO also offers a water trap for the unit's condensation drain in dimension DN32.

SIPHONUP (negative pressure) for connection to condensation outlet from the unit.
SIPHONOP (overpressure) for connection to any cooling coil in the supply air duct.

SIPHONHE02 (accessory) hot-wire is used to keep the water trap and water pipe free of ice. A thermostat is fitted to the hot wire to ensure low energy consumption.

Add all about the product series VEX330H Compact unit


Get free advice on ventilation products and system solutions

Export Requests:
Odensevej 76
DK 5550 Langeskov

Tel +45 6566 1236

Calculation programs

Use EXHAUSTO's free calculation programs for calculating ventilation plant and system solutions

Go to Calculation Programs
Teaser ecodesign

Ecodesign Directive

EXHAUSTO VEX air handling units and fans comply with the Ecodesign Directive. Read more here.

See more about Ecodesign here