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S380-16 16" Series 380 Channel Balance

Looking at the stamp as 15-1 it could be 1510 option but looking at it as b 15 it could be 1520. Weigh the actual window sash. 1510 will carry a window sash load of 4 through 6 pounds, a 1520 will carry a weigh range of 6 through 10 pounds. This information is based on 2 balances ... (cont.)