Everyone knows that it is customary to equip living quarters with natural ventilation systems. In such cases, the movement of air is carried out in a natural way, that is, without the use of fans. These systems are usually laid at the stage of building construction. They are channels through which polluted air is removed . In its place comes fresh, it passes through the cracks in the window openings. In winter, such ventilation is quite sufficient, and in summer its effectiveness is at a low level. The signal that natural ventilation does not cope with its duties is that you have to keep the windows open during hot weather.
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Forced ventilation systems are required in any room, especially in the hot season.