Investigating the natural air change rate in dwellings with very air-tight windows. Untersuchungen des naturlichen Luftwechsels in Wohnungen mir sehr fugendichten Fenstern.

Describes investigations into the air change rate in dwellings with very air-tight windows carried out by the West German Institute for Water Earth and Air Hygiene under a contract from the Federal Building Ministry. Treats the 80rooms investigated in 20 different buildings and in some office type rooms in Berlin. Notes the measurement method and the procedure of evaluating the results. Gives some results in graphs. Summarises the findings of the analysis of the results. Finds that in rooms with very air-tight windows the air change rate is frequently 0.3, which is well under the lowest hygienically permissible value and that these rooms should only contain one third of people which can be accomodated by rooms with averagely leaky windows. Treats pollution concentrations in rooms with low air change rate.