Building and ductwork airtightness

Legislative drivers and new research with demonstrated energy impact on the importance of building and ductwork airtightness are leading to increased activity in this aspect of building energy performance. The paper reviews examples of European countries that account for both building and ductwork airtightness and thus include in their energy performance regulations required or recommended minimum airtightness levels with or without mandatory testing. It addresses incentives through calculation procedures and subsidies that reward a good level of building airtightness.