Air infiltration. Where we stand today. Outlook. Zusammenfassung. Wo stehen wir heute. Ausblick.

Briefly notes the significance of ventilation heat losses for energy consumption. Notes the main sources of air pollutants in indoor air and the recommended fresh air rates per person for housing, for smokers and non-smokers. Notes the need for a well-sealed facade with mechanical ventilation and for judicious facade leakiness in the absence of mechanical ventilation. Notes the long-term need is for improved control of air infiltration. Notes briefly the AIC publication "Air infiltration control in housing". Treats the significance of ventilation heat losses for sizing heating installations. Notes methods of checking air leakiness of buildings. Concludes by noting research results accumulated over the last few years in this field. Notes possibilities for cooperation between interested parties for control of air infiltration.