Place the top section flange on the outside edge of both the right and left sides and the
back. Secure with the remaining 4 small, self-tapping sheetmetal screws.
Note: Since there are similar slots on the top and bottom of the side sections, it may appear
that the flanges of the top piece go inside the slots. However, the outer flange of the top piece
must be at the extreme outside for correct water shedding.
