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What is demand-controlled ventilation?

What is demand-controlled ventilation?
Posted on 22-6-2021 by Nienke Vinkenvleugel

Besides creating a healthy indoor climate, would you also like to save energy without any effort? In that case, you could opt for demand-controlled ventilation. Without having to look after the system, there will always be clean and healthy air in the residence. This system can easily be applied to some MVHR systems and MEV systems.

The insulation and airtightness of houses has improved enormously over the years. Therefore, there is less and less natural ventilation through cracks. Modern demand-controlled ventilation is no longer based on the number of cubic metres in a house, but on air quality. In addition, in the past, mostly only the kitchen and bathroom and/or toilet were ventilated. Ventilation therefore plays an even greater role in keeping the indoor climate healthy. In poorly ventilated houses, the chance of mould, moisture problems, house mite, allergies and other health problems is greater.

With demand-controlled ventilation, air exchange is regulated on the based on the air quality that is measured with sensors. These sensors measure the CO2 and/or humidity levels in a room. When the air quality is good, the system needs to ventilate only slightly. The air quality can decrease because, for example, there are many people in the living room. In this case, the MEV or MHVR system will ventilate more.


Demand-controlled ventilation in different zones

Ventilating with DuoZone means that the system supplies more air through control valves. The ventilation system can be divided into a day zone and a night zone. When the CO2 level in the living room is high because of the presence of people, the system will ventilate more. What is so different about DuoZone is that more fresh air is supplied to the living room, but not to the bedroom. There, the ventilation system will continue to ventilate minimally. Also, the system will not immediately start to ventilate more, but through the control valves more air will be supplied to the living room.

If the air quality still does not improve, the amount of ventilation air will only be increased gradually. This way, it is not necessary in the beginning to ventilate more air, but the available ventilation air is first sent to the place where the ventilation air is needed. When there is nobody present in the rooms, less ventilation is provided and when there are people present in both rooms, extra ventilation is provided in both rooms. As a result, each room receives sufficient fresh air, but never too much. A lower ventilation flow rate means lower energy consumption and a lower noise level.

View the DuoZone demand-controlled ventilation systems from Orcon, Itho and Brink here. You can also choose a QuattroZone ventilation. Quattro what? With QuattroZone, not only is the supply divided into two zones, but also the extract. Read more about it here.


The advantages of demand-controlled ventilation


  • A healthy living climate
  • Flexible system
  • Fully automated system
  • Low maintenance
  • Easy to install
  • Simple to operate
  • Energy-saving and therefore cost-effective



Good to know


  • The ventilation system does not get disrupted when you ventilate naturally; open a window or a door.
  • The ventilation system must be tuned and requires maintenance every 2 years.
  • The ventilation system does not react to (undesired) odours; you will have to deal with this manually.


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