I need some help in calculating the load rating for a multi-bar hinge. This hinge is different from a door hinge. It is fitted beneath the windows and can be used for either side-opening of the windows or for top-hung windows (windows for high-rise glazed glass buildings). The hinges are available in sizes from 8 inches to 30 inches. I need help in calculating the load rating of these hinges. I am attaching the photo of a sample hinge.