window balance

A handy person says:
I have a circa 2000 large Marvin double hung window(29" wide) with both balances broken. They are labeled 26X. Is the 26hd the appropriate choice for the S751-26 replacement balance?
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Donna from SWISCO responded:
I cannot tell by the manufacturer or label if this is the proper series. The stamp options signify different weight tolerances. Remove the window sash and place it on a scale.

26" Series 751 stamp options:

25r will carry a window sash weight range of 10 through 20 pounds
25hd will carry a window sash weight range of 20 through 24 pounds
25tg will carry a window sash weight range of 24 through 30 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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