sash balance

A quick learner from Columbia, MO says:
Hi! I needed a 28 inch sash balance but the stamped number on my window says 28B. I weighed the sash and it is 18 pounds. Which sash balance should I order?
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Donna from SWISCO responded:
Hi! For the Series 750 you will need 2 of the S750-28 with stamp 27R.
A pair with option 27R will carry a window sash weight range of 10 through and including 19 pounds.

This information is based on 2 balances per sash. Balances are designed assuming friction in the jamb weather-strip will carry a portion of the sash weight. Suggested sash weights are approximate.
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