Window sash channel balance

A home owner from Murfreesboro, TN says:
I want to replace the channel balances for my window that weighs approximately 25lbs. Do I need balances that are 25lbs each or is the weight divided with two 12-13lb balances?
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Tom from SWISCO responded:
The stamp options available for the S795-27 are calculated assuming both balances are supporting this weight. You would not divide it between two balances. If your sash is 25 pounds, I recommend the 27D option.
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