AIVC's Ventilation Information Paper #45.4 summarizes current knowledge on trends in building and ductwork airtightness in Belgium.

This is the fourth paper of a series being developed and dealing with trends in building and ductwork airtightness in various countries. 

The paper can be downloaded here.

Previously released papers include:

• Ventilation Information Paper #45.1: Trends in building and ductwork airtightness in Estonia
• Ventilation Information Paper #45.2: Trends in building and ductwork airtightness in Spain
• Ventilation Information Paper #45.3: Trends in building and ductwork airtightness in the Czech Republic