When measuring for glass there are two measurements which need to be
taken. The size of the glass you can see (visible glass measurement)
and the actual size of the hole (hole measurement).

Both measurements should be taken top and bottom, left and right. This
is because the openings are not always perfectly square.
Panels can be made to any shape. If your panel is not a square or rectangle
it is best to cut a piece of paper to fit the visible glass
measurement. Remember to mark the top.
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