Replace 2 17 inch balancers

Question

NUAIR window. 9/16 width 5/8 depth 17 inch with winged ends. 1640 stamp. Can you please give me the replacement model number?
Thank You
Scott

Casey · Accepted Answer

Hi Scott,

With this combination of attachments, you could have either an S380-17 or S385-17 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 1640 spring strength options for your replacement balances.

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

Comparison of the S378, S380 and S385 balance shoes.