SWISCO - The Replacement Hardware Authority

spiral window balances

A quick learner from Hillsdale, New York says:
HI,

I have several double hung windows in an old house, that have never been fully installed.
Do to the framing of the windows, the best solution is to use non tilt spiral balances.
Yet i need your help to select the proper model.

How do you determine the balance length required for each window?
(do you measure the height of the lower sash and add or remove an inch?)

How do you determine the end or bottom piece?

Is the width will be determined by the size of the channel in each sash?
-there are 6 windows and they are not heavy.

I appreciate any help you can offer.
thank you
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Paul from SWISCO responded:
Thanks for posting! If they are wood sashes, you will need a Series 500 spiral balance with a 17-012 bracket. As for the specific balance size, let me have the glass height of the top sash ans bottom sash and I can work from there.
A quick learner from Hillsdale, New York says:
Hi Paul,

Yes they are wooden windows, and here are the glass heights:

TOP BOTTOM
15-3/4" 15-3/4"
19-3/4" 19-3/4" (3 sets of windows)
18" 18" (2 sets of windows)

6 windows total for now.
Thank you for your help!
User submitted photos of a window balance.
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Paul from SWISCO responded:
Thank you! For the window that measures 15-3/4", I would consider our S500-17 for the top and S500-19 for the bottom.

For the window that measures 19-3/4", I recommend our S500-21 for the top and our S500-23 for the bottom.

Finally, for the window that measures 18", I recommend our S500-19 for the top, and the S500-21 for the bottom.

I think that should about do it. Just don't forget the 17-012 brackets!
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