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Tom from SWISCO responded:
May 22, 2023
Thanks for reaching out to us. This is definitely an issue, but it's one I think we can solve. It'll just take a little detective work. Before we do anything, I'd like your analysis on which fitting configuration would be better suited for this window. Some details to look out for is whether the sash drags during operation, or makes any noise on one particular side. I'm not as concerned with the top nylon fitting (which are identical) as I am with the bottom, the depth of which can make a huge difference. Also see if there are any drag marks in the track on either side. If there is, then that's the side we can rule out. As for length, there is a very simple formula we can use to determine the proper size. What you need to do is measure the height of the visible glass and then add 1". For example, if your visible glass height is 30", then you want a 31" long balance. That will allow me to verify if 25" is the proper size. |
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Tom from SWISCO responded:
June 2, 2023
The glass height +1 rule is fairly universal for windows of this make. That's not to say that your case isn't an exception, but that's not a scenario I've ever encountered before. If that is what we're dealing with then it might be a custom construction. Considering the fact that you have two entirely different balances installed in the first place then I guess I'm not surprised. It seems that whoever installed this window had a bit of a time with it. Maybe they were just as confused as us. You could try the 24" balance, but I cannot be 100% sure that this length would work for you. What I can say is that the 2340 option should be perfectly suited for a sash that's just over 18 pounds. In fact if your sash is over that mark then I think 2340 is the far better choice, so you're on the right track there. |
