Window balance

Hello,

With this combination of attachments, you could have either the 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. Please note that we recommend replacing the balances on both sides of the window at the same time to ensure equal support on both sides of the sash. Replacing only one side can lead to damage to the hardware or the window itself. Thank you and let us know if you have any other questions or concerns.

Comparison of the S378, S380 and S385 balance shoes.