This series 371 channel balance also known as a block and tackle balance has a 18" long metal channel and is for a non-tilt window. The channel's width measures 9/16" but is considered 1/2" in the trade. This balance comes fully assembled with a 15-005 shoe and a 19-031 top attached. Often used with Rollyson non-tilt windows.
|Stamp Option ||Sash Weight Range|
|1710 ||5 to 8 lbs |
|1720 ||8 to 12 lbs |
|1730 ||12 to 14 lbs |
|1740 ||14 to 17 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.