Air infiltration, air quality and ventilation research in Finnish buildings - general survey.

Describes research work in Finland concerning air infiltration and ventilation in buildings from 1979. Types of ventilation system in finnish houses, flats and other buildings are discussed. Reports on a model developed to predict the correlation between various factors and air infiltration. Gives a summary of pressure test measurements carried out in a few hundred small houses, and presents proposals for recommended airtightness levels in new buildings. Describes warm air heating systems, heat recovery systems in flats, and maintenance problems with ventilation systems.