A rear wall structure of a passenger compartment includes a vent opening and a horizontally extending seal protruding in a vehicle forward direction. A trim panel has a rear surface facing the rear wall structure. A vertically extending seal extends from the rear surface. With the trim panel installed to the rear wall structure the vertically extending seal contacts the rear wall structure, and, the horizontally extending seal of the rear wall structure contacts the rear surface of the trim panel such that the rear surface and the vertically extending seal of the trim panel and the upright interior surface and the horizontally extending seal of the rear wall structure define an air outlet passageway that extends from an opening in the trim panel to the vent opening.