This series 371 channel balance also known as a block and tackle balance has a 26" 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|
|2510 ||5 to 9 lbs |
|2520 ||9 to 15 lbs |
|2530 ||15 to 19 lbs |
|2540 ||19 to 25 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.