Development of an acoustic method for the determination of the air leakage of building elements installed in a building. Entwicklung einer akustichen Messmethod zur ermittlung der Luftdurchlassigkeit von Bauelementen in eingebauten Zustand.

The conduction of sound through the gap between window and wall depends on the width of the gap. This width also determines the air leakage, suggesting that air leakage might be measured by an acoustic method. Notes method requires that cracks are relatively large and have fewer than three kinks. Reports measurements in a wind tunnel of air flow through crack models made from aluminium and compares results with theory. Finds empirical expression relating pressure difference to air flow and gives graphs of results.