Replacement channel balance

Quick Learner from Pittsburgh

I'm trying to replace a channel balance on a Great Lakes Window Co double hung vinyl window that was installed in the late 90's. The metal section is 22" long. As shown in the picture, markings are: 21TG, looks like 3.S.I., and BJ.

Thanks!

Scott

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Tom
Tom from SWISCO
SWISCO
Expert

Hey, Scott. Your balance here looks like a dead ringer for our Series 770, though the stamp rating you show is not typically used on this Series. With that in mind I would recommend weighing your sash on a scale to confirm which option to choose. We have a chart on each Series 770 store page that tells you how much weight each option supports.

Quick Learner from Pittsburgh
Thanks so much Tom. I'll wiegh the sash, check the chart and be back in touch!
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