window balance stamp #

A home owner from LANCASTER CA says:
My balance has 26 4 BSI on it. how do I tell the sash wieght ?
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Tom from SWISCO responded:
A stamp of "26 4" usually corresponds to our 2640 option, but you can always weigh your sash on a scale to confirm. We have a chart on the S385-26 store page you can use as reference.
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