Casey from SWISCO responded:
October 24, 2022
Hello, With this combination of attachments, you could have either an S380-30 or S385-30 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'll also need 2940 spring strength options for your replacement balances. Thank you and let us know if you have any other questions or concerns. Comparison of the S380 and S385 balance shoes.
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Casey from SWISCO responded:
October 25, 2022
Based on your measurement and the 2940 stamp on your original balance, you would need the S380-30 channel balance with a 2940 strength option to support a window sash between 23 and 28 lbs. You are welcome to weigh your sash to confrim that it falls within the supported weight range if you're not sure that the original balances had the appropriate strength options. |