Spring Window Sash 2975 and 29 9 FX CMC

Hello,

With this combination of attachments, you could have either the 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also need to weigh your sash to determine which option you'll need for the 29 9 stamped balances, which is from an outdated weight system. There's a chart on the product page that explains how to choose your option based on the sash weight. The 2975 stamped balances will support a sash between  42-45 lbs. Thank you and let us know if you have any other questions or concerns.

Comparison of the S380 and S385 balance shoes.