VEX300C Ceiling units

VEX300C Ceiling units

VEX300C Ceiling units

VEX300C ceiling units are very compact,  making them ideal for installation above suspended ceilings, etc.

Two door variations allow for either vertical or horizontal opening, ideal for servicing requirements with different types of suspended ceilings and where there is limited space available.

VEX300C dørvariationer

The optimised design delivers ultra-low sound levels allowing units to be installed in the rooms they ventilate.

The units are available as a LEFT or RIGHT version -  with two motor sizes.

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

VEX320C/VEX330C de-icing bypass

The VEX320C/VEX330C 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.



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 is below the set value, e.g. Tice < 0 ℃.
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 or if there is high humidity in the extract air, which frequently is not the case in winter.


Capacity, VEX300C

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


Sound level

VEX300C, extremely quiet air handling units

The VEX units in the VEX300C series are extremely quiet, with a far lower sound level than similar products on the market.

For for exact sound data, see our calculation programs.



The compact units are 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 section "Certificates".



Cabinets are made from Aluzinc® AZ185 class C4 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

VEX300C is equipped with an optimised centrifugal fan impeller with backwards curved vanes. The impeller design delivers high output with low energy consumption.  

Connection 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).

Filter size
VEX320C: 345 x 330 x 48 mm.
VEX330C: 345 x 840 x 48 mm.


VEX300C 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 VEX300C 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 VEX320C 15.2 m2
- Heat transfer area VEX330C: 27.6m2
- Weight VEX320C: qty. 1 à 14.5 kg
- Weight VEX330C: 2 x 12.5 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 VEX300C series:

Water heating coils - HW

HCW rundekanaler 150 100

Non-insulated 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 the heating coils is found under Cooling and heating coils.

Electric heating coils - HE

HCE runde kanaler

Non-insulated external electric heating coil.

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

More information about the 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. 



A wide range of accessories are available with the VEX300C range.

Closing damper - LS 

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


 Water trap

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 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 VEX300C Ceiling units


Get free advice on ventilation products and system solutions

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Odensevej 76
DK 5550 Langeskov

Tel +45 6566 1236
Teaser ecodesign

Ecodesign Directive

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

See more about Ecodesign here