Paul from SWISCO responded:
August 5, 2015
I can't guarantee this will work, since we only deal with replacement parts, but with our best judgement, I think the S385-39 balance installed as a normal double hung is a good way to go. The spring strength option is 3820, for a sash weighing 14 through 19 pounds, so using two on each side of the sash should about cover it. Again, though, I can't be certain it will work.
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Paul from SWISCO responded:
August 11, 2015
Awesome, glad we could help! Let me know if you need anything else.
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