This series 380 channel balance also known as a block and tackle balance has a 38" 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 19-005 top attached.
|Stamp Option ||Sash Weight Range|
|3710 ||8 to 13 lb |
|3720 ||13 to 18 lb |
|3730 ||18 to 23 lb |
|3740 ||23 to 32 lb |
*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.