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How to determind sash weight for channel balance

Home Owner from San Diego CA
Hi, we have sunair channel balance stamped 2740 . So we ordered S380-28 for 2740. One side went okay, but other side got broken during installation.
My hasband weight window sash , it was 20lb. But we have 2740 original balance in it.
Our windows have been so hard to open and shut since I own this house. We purchase this house when this house was 5 years old. Do you think they didn
User submitted photos of a window balance.
2 Replies
Tom
Tom from SWISCO
SWISCO
Expert
It looks like your question was cut off. However, everything you said sounds right. The S380-28 2740 is meant to hold a 19 to 26 pound sash. How did your balance break during installation?
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