Abstract: The invention relates to a setting device for a ventilation flap (12, 12a, 2b) in an air duct, particularly in a heating and ventilation system of an automobile, with an electric motor (2) executing setting movements and with a control unit (3) for the electric motor (2). In order to minimize the outlay in terms of assembly and the replacement parts to be kept available, there is provision for designing the electric motor (2) as a stepping motor activated by output signals from a control unit (3) adjacent to this stepping motor, and the control unit (3) has encoding inputs (K1, K2) for selecting the direction of rotation and/or the rotary angle.