Abstract: A converted passenger van has an aperture cut in a side body panel in which a bay window is installed. A shroud extends around the upper and forward edges of the aperture, and includes an active deflecting portion which extends outwardly from the side body panel and then inwardly over a portion of the window. The forward edge of the shroud deflects moisture entrained in the airstream created by the forward movement of the vehicle away from any discontinuities between the edge of the aperture and the frame holding the window, and the portion of the shroud extending along the upper edge of the aperture deflects water draining from the roof of the vehicle when the vehicle is parked away from any discontinuity between the upper edge of the window and the corresponding portion of the window frame.