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Paul from SWISCO responded:
September 14, 2017
Being that you have historic wood windows, our Series 500 5/8" balance with a 17-012 bracket will work very well. This balance system has been used by wood window manufacturers going back to the 1940s. To determine the lengths of your spiral balances, you would add 1" to the glass height for the top sash and 3" to the bottom sash glass height. I'd be happy to field any other questions that you might have, as well.
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Tom from SWISCO responded:
October 21, 2020
In almost all cases, you only need one balance per side. I have known some rare windows to use two per side, but those are in extreme cases where the weight of the sash is incredible. 30 pounds is not really that big of a deal. It's very unlikely that you need two balances per side. That would be overkill and your windows would probably operate worse for it. At the end of the day, it depends on the size of the balance and the weight it supports. We have a chart on each Series 500 store page (assuming that's what you have) that tells you exactly how much weight each color tip option supports. That should tell you if the balances you want to buy can support the weight of your sash. |
