A contribution for the quantification of the influence of windows on the airtightness of Southern European buildings

Results revealed that the windows' permeability indices ranged from 4.8 to 96.4 m3/(h m2) and from 1.2 to 30.8 m3/(h m), with average values of 28.7 m3/(h m2) and 8.9 m3/(h m), the roller-shutter contribution can be highly variable; also the year of construction, the frame material and the opening system are the key parameters for the airtightness of windows.