sash weight range

A quick learner from ocala, fl says:
how do i figure the sash weight range? my marking on the 34inch channel balance is 33 9 of BSI
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Tom from SWISCO responded:
Your best bet is to weigh your sash on a scale, then refer to the chart on the S385-34 store page. If your sash weight is not represented there, let me know.
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