29 inches 28B channel balance

A home owner from windermere fl says:
November 17, 2021
need to replace original balances. 29 inches long and stamped 28B
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Lauren from SWISCO responded:
November 19, 2021

Hello, thank you for posting! 

With this combination of attachments, you could have either an S380 or S385 channel balance. You’ll need to measure as shown below. The Series 380 has a 1" bottom attachment, and the Series 385 has a 1-3/32" attachment. You will need a 29" balance with a 2820 stamp option, meaning your window sash weighs between 12-16 pounds. 

Swisco.com
Please let me know if you have any questions. 
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