Tom from SWISCO responded:
July 16, 2015
Could you use our Series 500 spiral balance? This has been used on wood windows for decades. You would also need a bracket like our 17-012. |
Paul from SWISCO responded:
July 17, 2015
Wow, these are very old balances. Your glass height, based on your photos, looks like 20". The formula we used to calculate length of Series 500 balances for wood sashes is simple: we simple add 1" to the visible glass height for the top sash, and 3" for the bottom sash. So, for your top sash, I recommend the S500-21 and for the bottom sash, I recommend the S500-23. Plese confirm! I also recommend a Red Tip for both, which can hold an 8 pound sash. For the balance bracket, I like to use our 17-012 on the bottom of the sash and secure it with two screws.
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