Despite its practical importance, there has been a general lack of information on air infiltration through building background cracks, especially when induced by temperature differences. This paper describes experimental work in which it was found that the rate of air infiltration due to temperature differences through cracks is proportional to the temperature difference between two adjoining rooms (or a building and the atmosphere) which the cracks connect. This finding agrees with theoretical predictions. The experimental results also confirm that the infiltration rate increases with increasing vertical distance between cracks.
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