This invention is for a ventilation outlet (1) which is self-adjusting with multiple flow rates presenting a passageway for the ventilation air and equipped with an adjustable flap (6) and comprising a control flap (7) with one face (10) meant to channel air entering and presenting, on the one hand, a connecting edge (11) equipped with an attachment means (12) making it possible to attach the control flap around an axis for a given position and, on the other hand, an opposite edge constituting a trailing edge (14) which features, from the connecting edge to the trailing edge, gradual successive flat layers making up the control flap (16 to 19) given the latter flap a clearly convex shape.