Emily from SWISCO responded:
May 20, 2022
Hello! This isn't the S140, you actually have our 15-175 which uses the Series 152 coil springs. Since your sash weighs 17 pounds, you can use two S152-4 4 pound coil springs on both sides of the window. This will total 16 pounds of overall support. So long as the spring weights are within a pound of your sash's actual weight, this setup should work for you. |