The results presented in this paper concern only the specific examined cases. The ventilation process in a greenhouse depends on a variety of interrelated factors. Therefore our conclusions cannot be generalized easily. The ventilation efficiency of a greenhouse not only depends on its design characteristics, but also is influenced by the weather conditions at its location. An optimum design (size, shape and position of the windows), can be selected only if the local weather conditions (direction and speed of the wind) are taken into consideration. Therefore, our present work needs to be extended and the most common greenhouse types must be systematically investigated for a variety of external conditions and ventilator
configurations.