Casey from SWISCO responded:
April 13, 2021
Hello, With this combination of attachments, you could have either an S380-29 or S385-29 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 2830 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:
June 7, 2021
The 28C stamp shown in your photos would correlate to our 2830 strength option to support a sash weighing between 16 and 23 lbs. If you think that might not be enough tension. you are welcome to weigh your sash to compare to the chart under the S380-29 product description to confirm that you choose the correct option. You'd just need to remove the window sash from the frame and weigh it on a standard bathroom scale. |