Window airtightness and its influence on energy saving and minimum required ventilation.

Presents method for establishing conditions and an acceptance criterion for window air-tightness testing in relation to average energy (heating) saving per winter. Uses wind velocity data from israeli meteorological station of Ashdod to demonstrate difference between various methods of evaluating design wind velocity. Uses 41 different typical dwellings to determine unique criterion for acceptable air leakage under test conditions which ensures average of 1 air change per hour in most Israeli dwellings. Demonstrates energy inefficiency arising from flueless appliances when minimum health standards are required and translated into minimum constant ventilation requirements.