Designed for sideload sash applications, suitable for both residential and commercial windows. This balance is aama verified with a class 2 rating and complies with the north american fenestration standard (nafs). It offers easy installation, allowing for quick sash insertion or removal. The 21" channel length can be identified through id stamps including 20-30, 20-3, and 20-c. Part# 17b20-30.
Number. 50413236