... Casement Width(C)Arm Width(B)Arms qtyMax Window heightMax Window WidthMax Window WeightSupportive Suspension Strip ThicknessHeight(H)Opening Angle8" ... width of a window,and if the window is lighter,it can be 1/2.For a top hung window,while selecting hinges ... ,generally speaking,a selected hinge will be 1/2 of the height of the window. ...