Casey from SWISCO responded:
October 30, 2023
Hello, I would recommend starting by comparing the S370-29 channel balance to yours. Your smaller window would need 2810 strength options, while the larger window would use 2830 options. Keep in mind that it is important to replace the balances on both sides at the same time to ensure that the sash is evenly supported. Thank you. Close up view of the S370 balance top.
Close up view of the S370 balance shoe.
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