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.
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.