balance option numbers

A home owner from Gilroy California says:
what does option 2740 mean for the S350-28 balance?
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Donna from SWISCO responded:
To determine the proper stamp option remove the window sash and place it on a scale.

SWISCO Series 350 balance, 28" with stamp option 2740 will carry a window sash weight range of 19 through 26 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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