Here details of window and frame structure detail windows would receive an aluminum surround that projected out from the finish face of the wall to heighten the perception of the depth of the windows placement within the wall A window frame is the combination of the head, jambs and sill that forms a precise opening in which a window sash fits. So if you look at our handy diagram, the frame is the outer boarder of the window. for more details of Section Details of window and frame structure detail download this file.