Tom from SWISCO responded:
September 30, 2015
A 23A stamp usually corresponds to our 2310 option, but you can always weigh your sash on a scale to confirm.
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Tom from SWISCO responded:
September 30, 2015
The number in the stamp does not indicate the length of the metal channel. In fact, the first two digits of the stamp are usually one inch less. Typically, these digits represent the height of the visible glass.
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