This paper tries to give a reasonable description of the state of the art of the Belgian building stock with regard to ventilation. The Belgian research projects on ventilation in buildings, which were carried out recently, enable a precise overview of the quality of the Belgian building stock to be gained. It shows that airtightness varies a great deal from one building to another. Very leaky as well as very airtight buildings are frequently found. Notable is the near absence of controllable ventilation provisions.
The CO2-concentration of room air provides an indicator for the air quality in spaces without smokers. A classroom with mechanical ventilation has been evaluated for eighteen months using such a technique. These measurements were made within the framework of the research project Gumpenwiessen. A model to calculate the CO2 concentration as a function of occupancy, activity level of the occupants and air change rate was developed. It was validated using the measurements data.
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