Natural ventilation has gained prominence in recent times as a method of ventilating buildings. The two fundamental principles of natural ventilation are stack effect and wind driven ventilation. This paper describes a particular stack performance realized in a building (school) at real scale by computation of the wind induced ventilation and a comparison of the stack performance (airflow rate extracted and wind speed) respect to other systems (wind catcher, wind jetter and wind turbine) are

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... o showed. The realization of the system, actually working, shows the synergy between a plant design and installation using traditional energy sources with innovative engineering techniques providing for the use of integrative energy. In this case, the wind action plays an important role for the conditioning of the school, integrating and giving a significant energetic contribution to the air cooling system. The school building (a nursery) has been built in Modena and is actually working.