Tom from SWISCO responded:
November 2, 2012
Thanks for posting. Before I can confirm what Series channel balance you have, I'll have to figure out what your bottom shoe is. Please look at the measurements for our 15-001 and 15-002 bottom shoes and note their depths. As you can see, they are 1-1/8" deep and 1" deep, respectively. Which measurement more closely resembles your own shoe?
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Tom from SWISCO responded:
November 6, 2012
Thanks for getting back to us. In that case, I agree with you that our Series 390 appears to be the closest match. Please see our S390-17 and S390-26. For the 17" balance, take a look at the 1610 option. This can carry a window sash weight range of 5 through 8 pounds. For the 26" balance, consider our 2530 option. This can carry 15 through 19 pounds. Weigh both of your sashes and compare them to these ranges to see if these options would work.
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Tom from SWISCO responded:
November 8, 2012
If that sash weighs 10 pounds, then you should go with the 2520 stamp, yes. Have you ever had any difficulty opening that window in the past? It's odd that it would have the 2530 weight rating for such a light window.
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