Ventilation duct for ventilating a passenger interior of a motor vehicle

A ventilation duct for ventilating a passenger interior of a motor vehicle, comprising:

• an inflow duct for supplying air;
• a main guiding duct formed by main guiding duct walls extending from the inflow duct to an outlet opening for guiding at least part of the air of the inflow duct along a main flow direction toward the outlet opening;
• first and second opposed bypass ducts formed by bypass duct walls that branch off from the inflow duct for receiving part of the air of the inflow duct, each of the bypass ducts having a downstream end opening into the main guiding duct upstream of the outlet opening for introducing a flow jet into the main guiding duct at an acute angle to the main flow direction and inward toward a center of the outlet opening, first and second convexly curved surfaces extending continuously from the downstream ends of the respective first and second bypass ducts to the outlet opening of the main guiding duct for generating a Coanda effect at the outlet opening, each of the bypass ducts further having an upstream end and a funnel-shaped inflow region leading into the respective bypass duct, each of the funnel-shaped inflow regions tapering to smaller cross-sectional areas at positions farther downstream to accelerate the air that is branched off into the bypass ducts, first and second inlet flaps for selectively and independently opening and closing the respective first and second bypass ducts for generating controlled directional changes of air leaving the outlet opening, the inlet flaps that are in the open position protrude into the inflow duct to define funnel-shaped extensions of the inflow regions of the bypass ducts with larger cross-sectional areas at more upstream positions, and first and second outlet flaps at downstream ends of the first and second bypass ducts respectively for selectively opening and closing the downstream ends of the first and second bypass ducts, the first outlet flap being opened when the first inlet flap is opened and being closed when the first inlet flap is closed, the second outlet flap being opened when the second inlet flap is opened and being closed when the second inlet flap is closed so that the downstream ends of the bypass ducts do not affect airflow in proximity to the outlet opening when there is no airflow through the respective bypass duct;
• and
• at least one dividing wall in the main guiding duct at least at one position spaced inward from any of the bypass duct walls that define the bypass ducts for dividing the main guiding duct into at least two part ducts, and a guiding flap at an end of the dividing wall that points toward the inflow duct for setting different flow velocity in the pasrt ducts.