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.
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