Outdoor air penetration into buildings. Aussenlufteinfall in Gebaude.

States that comparison of different methods of calculating the volumes of outdoor air entering a building through the window shows that the chief deficiency of the standardised method of calculation is neglect of the importance of the relation between building dimensions, the wind profile andthe resulting pressure distribution at the building. Proposes an approximation method which significantly improves the accuracy of the calculation and also permits the calculation of flow through buildings for each possible combination of the factors determining the flow. The calculation can be performed manually as well as on a computer.