I have a single hung single pane window and need 2 springs.
Number on the balence is
Unique 28-C-30.
Don't know the weight
But the size is 52 wide by 31 high for the one panel.
Unique 28-C-30 Window Balance

Handy Person from Orlando
Aug 22, 2021 5:41 pm
2 user uploaded images
2 Replies

Emily from SWISCO
Aug 27, 2021 1:41 pm


Hi there!
With this combination of attachments, you could have either an 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 want to select the 2830 stamp option when prompted. This is based on your older stamp rating of "28C."

Comparison of the S378, S380 and S385 balance shoes.
Related Products
Related Videos
Related Guides