A ventilating duct for a ventilation device of a motor vehicle includes a housing through which a flow can pass, with a main duct and at least one flow-directing element mounted rotatably about an axis of rotation in the housing. The housing has a first housing portion and a second housing portion, and the first housing portion is designed facing an air conditioning system of the ventilation device and is configured to be connectable to the latter such that the flow can pass through. The second housing portion faces a passenger cell of the motor vehicle and is configured to be arranged with the passenger cell such that the flow can pass through. The main duct is divided in the second housing portion into at least two sub-ducts with the aid of a partition which is arranged downstream of the flow-directing element.