Ventilation in dwelling houses. Messtechnische untersuchungen in neun wohnungen.

The use of heating and ventilation was measured in several flats to find the relationship between the two. Measurements were taken in 9 flats in a 6-storey block in Berlin, with various types of ventilation system. Two flats remained uninhabited to serve as a comparison. The duration of the opening of windows of the individual rooms lastd on average up to 15 hours per day during the whole heating period. The tenants' own evaluation of the duration of airing differed immensely from this result. The specific use of heating in kWh/m2 dwelling space was naturally lowest in the uninhabited flats. The highest result was about 200% above the measurements of these flats, where, at a median room temperature of 21.6 degrees C, the temperature was maintained by opening the windows while the radiators were at their highest setting.