Paul from SWISCO responded:
October 12, 2017
Hello John. I believe our S385-33 channel balance would make a great replacement for you. Check your balance to see if there is a stamped number on it. That will determine which option to choose when ordering these balances. If there are no stamped numbers, the best way to determine which option to choose would be to remove your window sash and weight it. From there, you will take that number and correspond it to our sash weight range chart that is displayed on the product page.
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Paul from SWISCO responded:
October 27, 2017
It could be the installer had a limited number of balances and just used whatever was on hand. It happens all the time. If the sash is 30 pounds, I recommend the 3250 option. We have a chart on the S385-33 store page that you can use as a reference. You may want to get the exact sash weight just to be sure.
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