A vehicle air duct includes a plurality of walls that are connected and define an interior air space. The plurality of walls includes inner and outer surfaces. The air duct extends from a first end to a second end where the first end includes a connection opening. At least one of the plurality of walls includes at least one rib in a region corresponding to the connection opening. The rib extends outward from the outer surface of the at least one wall for maintaining the shape of the vehicle air duct.