window balance channels

Hello,

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. 

Your current balance stamps would support two different sash weights, which should be the same so that you have equal amounts of support on both sides of the window.  For this reason, you'll also need to 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.

Comparison of the S380 and S385 balance shoes.

That's how most of these balances work. The stamp indicates that the height of the visible glass in the window is 33" but the balance should be 34" long. It's a bit strange but we see that correlation all the time.