Series 765 replacement 22" block and tackle channel balance system for a tilt window sash. Sold individually. Used in Silver Line vinyl, single hung, new construction windows, as well as Silver Line Series 1200 vinyl, double-hung, replacement windows.
| Stamp Option | Sash Weight Range |
|---|
| 21-1 | 6 to 10 lbs |
| 21-3 | 10 to 15 lbs |
| 21-5 | 15 to 19 lbs |
| 21-7 | 19 to 24 lbs |
| 21-9 | 24 to 28 lbs |
*This information is based on 2 balances per sash. Balances are designed assuming friction in the jamb weather-strip will carry a portion of the sash weight. Suggested sash weights are approximate.
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