I have a window that shows a 3130 bsi lm. However, I weighed myself with the window and it is coming in at 28.5 pounds. The metal part of the channel balance is 32" long. Is 3130 too light? Should I go to the 3150 or just under at 3140?
What does the lm stand for? I know I need the 385 ends based on the other window I replaced. But, since this is the same size window, the last owners messed all this up because I bought the wrong size from you on the other window.
2 Replies
Tom from SWISCO
Oct 8, 2014 12:50 pm
Thanks for posting! Since your sash is 28.5 pounds, I would recommend our 3150 option. I'm surprised this old balance was using the 3130 option. Did you ever find that it was difficult to operate?
I'm not sure what the "LM" stands for, but I assume it's some kind of manufacturing mark. I wouldn't worry about it.
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