Bob from SWISCO responded:
January 21, 2021
Hello there. Having two coil springs with different spring weights on the same side of the sash isn't really unusual. It all comes down to whatever the exact weight of the window sash is. If the sash weighed 24 pounds, then you'd need 12 pounds of support on both sides of the window. In that case, the S160-6 6.5 pound spring and 160-5 5.5 pound spring would get you that desired number. If in doubt, obtain the exact weight of the window sash, and I can work out what you need. Make sure the coil springs are indeed 1/2" thick; if they're 3/8" thick instead, you'd need our Series 165 instead. I agree the pivot bar resembles the 26-378 and the 26-354 Vent Latch seems promising; but ultimately you'll need to compare the dimensions to confirm. |