Paul from SWISCO responded:
April 13, 2016
Hello! The spiral balance we recommend in this situation is our Series 500 . These have been used on wood windows like yours since the 50's. You would also need a bracket like our 17-012 to connect it to the bottom of the sash, and a charging tool like our 75-004 to give it the proper tension and to help install. See what you think!
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Paul from SWISCO responded:
April 19, 2016
Sure thing! Based on your sash size, I would go with 27".
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