US Patent 10017048 Active grille shutter for curved surface

An active grille shutter system having a frame with a first side facing a vehicle exterior and a second side opposite the first side that generally faces a vehicle engine compartment. The frame also includes at least two opposing cross-sectional curvilinear sides that form part of a curvilinear opening to allow air to selectively pass through the frame from the first side to the second side. Multiple rotatable vanes are placed within the curvilinear opening in order to selectively block airflow through the frame member. During operation of the active grille shutter system the vanes do not extend beyond the perimeter of the curvilinear opening of the frame when in the open and closed position.