Experimental analysis of air tightness in Mediterranean buildings using the fan pressurization method

► 20 air pressurization tests on Mediterranean buildings in Italy have been performed. ► BDT uncertainty model is presented considering both type A and B contributions. ► n50 average values are generally higher than in Northern Europe. ► Windows and chimney are the most critical causes in building over-ventilation. ► Pressure device and test conditions are critical tasks in uncertainty budget.