Technical performance of your channel balances.

A handy person from Connecticut says:
I have build a windscreen (aluminium frame construction) in front of an existing 40" glass railing where my screen is acting as the bottom half of a double hung window (down in the resting state and vertically up to block the wind).

The windcreen window has a 39in sash with a maximum vertical travel distance of 37in. The weight is about 60 pounds total (but it is 6" thick so I can put two channels per side for 15lb per channnel counter spring if necessay).

My questions are: will your PC S395-39 allow the full 36 inch travel distance, and do you recommend 1 or 2 change springs per side (i.e. a 30 pounds or 15 pound load per channel)?

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Paul from SWISCO responded:
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.
A handy person from CT says:
Hi Paul, thx for your advise. I purchased your 38" 3740s (one per side) and they installed simply and work fantastically in my unique and custom application (nice and smooth weight balance).
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Paul from SWISCO responded:
Awesome, glad we could help! Let me know if you need anything else.
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