Replacement Channel Balance

A home owner from Hawaii says:
See attached photo for questions on the proper length for replacement channel balances.
Thank you!
Brian
Thumbnail of the uploaded file named Balance fit.jpg
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Manuela from SWISCO responded:

Thanks for the detailed photo. However, we will need to see the balance removed from the window in order to assist you on which replacement balance could work in place of your existing balance. There should also be a stamped number on the balance. If so, please include that information as well. 

A home owner from Hawaii says:
Attached photo shows 23" and 24" length for balance. One is recessed in sash and other slightly extends below sash. What is the proper length? Thank you!
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Bob from SWISCO responded:

Your channel balances certainly should not stick out past the bottom of the window sash. Otherwise, the sash will not be able to sit properly within the window. Compare the length of each balance's metal channel--do not include the nylon attachments at either end in this measurement. The balance marked 24 4 should be 25" long, while the balance marked 23 4 should be 24" long. Just check these measurements to be safe, as sometimes balances were cut down by the original installers, to improvise with the parts that they had. Which of these balances was the original in the window? It certainly seems the balance that is 24" long is the proper fit, but there's another way to confirm this. The first two digits of these balance's stamp codes are derived from the height of the visible glass in the window sash. Measure your window sash's glass. If its 23" tall, than the balance with the stamp code 23 4 that is 24" long is definitely the right choice.   

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