When dealing with glass lights in doors, there are three (3) critical dimensions which must be coordinated:
Exposed Glass Size (EGS) - the horizontal and/or vertical dimensional size of the vision area of a glass light in a door (the actual size of the window you look thru). Exposed glass size may also be referred to as visible glass size.
Glass Cutting Size (GCS) - the net horizontal and/or vertical dimensional size of the glass being fit into the door window preparation.
Door Cutout Size (DCS) - the horizontal and/or vertical dimensional size of the of the cutout in the door required to accept the required glass trim.
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