Channel balance

Question

All dimensions fit the 28" series 350 but I'm not sure on the end treatments. Also the existing channel has a stamp 2790 BSI 30. But I think your 2770 should work. See photos - Please advise

Thank you,

Emily · Accepted Answer

Hi there!

With this combination of attachments, you actually could have either an S380-28 or S385-28 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.

As for your stamp, you'll need to remove and weigh your sash to choose the appropriate spring strength option. There's a chart on the S380 and S385's product page that will show you which option you'll need based on the weight of your sash.

If you have any further questions just let us know.

Comparison of the S378, S380 and S385 balance shoes.