Spillage of combust ion products from open f lued combust ion appliances represents a source of indoor air pollutants which can cause danger to health. Air extract fans are installed in kitchens in order to remove moisture and cooking smells, but the room depressurisation which they create is a potential cause of spillage. A series of experiments was therefore set up to determine the fan flow rate and internal/external pressure difference at which spillage first occurred in different open flued gas and oil boilers.
Airtightness deficiencies of building envelopes and weaknesses in the ventilation systems can disrupt the operation of heating and ventilation systems. This can lead to an insufficient level of air quality and higher energy consumptions. In order to assess the performances of buildings and ventilation systems, CSTB has designed and developed different experimental devices for field testing. In a first step, an equipment was produced to measure the envelope air leakage. This apparatus is mainly used for research purposes.
Modern one-family houses in Scandinavia built before 1980 are often naturally ventilated and heated by electric baseboard heaters. The overall supply of fresh air is often inadequate during the heating season in many of these houses. Long periods of time individual rooms might get too little fresh air. The performance of a natural ventilation system is very much dependant upon the overall airtightness and the distribution of the airtightness of the building and the weather.
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