A ventilation unit for an air-cooling tower and comprising a freewheel for drawing outside air and for discharging air in the upper portion of the ventilation unit. The freewheel has a rear face and a front face, the freewheel draws the outside air according to the direction of the axis of rotation of the freewheel by the front face and discharges the air radially to the axis of rotation of the freewheel, the ventilation unit being passed through by a drawing passage of outside air and by a discharge passage of air, the discharge passage of air directing the flow of air to the front of the plane formed by the front face. The subject matter also relates to an air-cooling tower and a method for drawing and for discharging air in such a ventilation unit.
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