Ventilation system

A ventilation device for a motor vehicle for regulating or changing the outflow direction of air exiting therefrom, comprising: a housing comprising at least one air inlet having an inlet opening and at least one air outlet having an outlet opening; a guide unit between the inlet port and the outlet port in the housing has a plurality of guide surfaces forming an air duct together with a portion of the housing surrounding the guide surfaces; a control element between the inlet and the guide unit in the housing for adjusting the volumetric flow ratio of the gas flow; the adjusting unit adjusts the control element, and the control element comprises a partially cylindrical air duct body in the housing, so that the air duct body can be pivoted around a first pivot axis perpendicular to the inflow direction. A slat unit having a plurality of slats coupled to each other as viewed in the inflow direction and pivotable about respective second pivot axes perpendicular to the first pivot axis is arranged in the air duc