35" windows channels

A handy person from Mount Pleasant, SC says:
There were no marking on the window channel.

Thanks for your help.
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Casey from SWISCO responded:


With this combination of attachments, you could have either an S380-35 or S385-35 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 to locate the stamp on your metal channel or weigh your sash to determine which option you'll need. There is a chart on the product page that explains how to choose your option based on the sash weight.  

Thank you and let us know if you have any other questions or concerns.

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