23" milgard

Handy Person from Washington
24.4lb window. Need both sides. I believe it is the Series 380 option 2250.
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Emily
Emily from SWISCO
SWISCO
Expert

Hi there!

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'll also need to follow the chart on the S380 and S385's product page to choose the appropriate spring strength for your channel balance.

If you have any further questions just let us know. 

Comparison of the S380 and S385 balance shoes.
Comparison of the S380 and S385 balance shoes.
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