Tom from SWISCO responded:
November 18, 2016
A stamp of "28C" usually corresponds to our 2830 option, but you can always weigh your sash on a scale to confirm.
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Tom from SWISCO responded:
November 22, 2016
If your stamp reads 28D, then 2840 may be the way to go. Once again, we would recommend weighing your sash just to be sure.
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