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In this study, the role of the shape, size and position of the windows, which play an important role in the natural ventilation of the buildings, in the ventilation of the buildings were examined. By using a blower providing constant velocity airflow, the best window model and position were determined for a total of ten window conditions, five wind directions, three wall inclination angles, and three wall thickness conditions. In addition, the system was also tested in the prevailing wind direction in the outer atmosphere. From the results obtained, it was found that the amount of air fed into the building increases in cases where the window size expands in an outward sloping way, the angle of inclination and the wall thickness increase, and the wind blows directly into the window. It has been observed that the air flow entering the building increased by 16-23% and 3-6% with the increase of the lateral slope and wall thickness of windows, respectively, but the air flow decreased rapidly with the increase of the angle of blowing the wind towards the window, and the air flow became zero when the wind blew parallel to the window opening. It has been seen that it is important for effective natural ventilation of buildings that window openings are constructed in the prevailing wind direction and on the opposite side of the building, that the interior partitions of the building are constructed to facilitate the linear flow of air, and that the indentations and projections that will cause turbulence outside the building are reduced as much as possible. [ABSTRACT FROM AUTHOR]