Air leakage through window joints Zur Luftdurchlassigkeit von Fensterfugen

According to TGL standard 112-0319, the demand of heat required for ventilating a building essentially depends on the passage of air through its window and door joints. This varies to a great extent. The losses of thermal energy can be reduced substantially by tolerance specifications for joint dimensions. Such tolerances will result in permissible resistance coefficients for different types of windows. Depending on thehygienic requirements suitable selection is then possible within a narrow margin of error. Wind tunnel tests showed a great dependence of air passage on wind direction and type of installation.