Air infiltration in the U.K. and its impact on the thermal environment.

Describes briefly mechanisms and sources by which air infiltration occurs in dwellings. Compares leakage rates through windows and through houses with european standards to illustrate values that can occur in the U.K. Discusses importance of infiltration to both natural and mechanical ventilation and gives examples of the ways in which infiltration can adversely affect the thermal environment in well insulated dwelling. Concludes that more attention should be paid to infiltration through adventitious openings including improving building construction to minimise infiltration.