Patent ID: 7437853

Claim:
An openable screen element unit in a building structure for insertion in an opening of a wall in said building structure, said screen element unit comprising at least one screen element side-hinged to a frame structure, said screen element being pivotally mounted over a hinge axis in the frame structure for opening and closing in a direction away from the opening: wherein the screen element comprises first and second planar sections, said first and second planar sections being mutually angled and arranged in different planes with an intersection line substantially parallel to the hinge axis; wherein said first planar section has a first visible surface providing a first appearance and said second planar section has a second visible surface providing a second appearance visually distinguishable from the first appearance when said screen element is integrated into the wall; wherein the first and second planar sections are placed in two planes with a mutual angle of 10° to 20°; and wherein the screen element unit comprises two screen elements side-hinged on either side of the frame structure and wherein the two screen elements have opposite opening directions.