Channel balance

A quick learner from San Diego Ca says:
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,
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Emily from SWISCO responded:

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. 

1
S350-28 : 28
28" Series 350 Channel Balance
S350-28
$10.25
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S380-28 : 28
28" Series 380 Channel Balance
S380-28
$10.05
VIEW >
S385-28 : 28
28" Series 385 Channel Balance
S385-28
$10.05
VIEW >
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