Series 378 Channel Balances

This is the SWISCO Series 378 Side-load Channel Balance Sash Support System (also known as a block and tackle balance) for non-tilt windows. The series is determined by the combination of the top and bottom fittings attached to the metal channel. When determining length, measure only the metal channel; do not include the fittings in this measurement. The metal channel's width is 9/16" but is considered 1/2" in the trade. It houses a spring and pulley system to raise and lower the sash and comes fully assembled with a winged 19-005 top fitting and a winged 15-029 (7/8" deep) bottom shoe.

Please note that the Series 378 closely resembles the Series 380 channel balance, but they are not interchangeable. The difference lies in the depth of the bottom shoe: unlike the Series 378, the Series 380 balance uses a 15-005 (1" deep) bottom shoe.