Constant force balance

A quick learner from Fort Lauderdale says:
October 4, 2018
For Kolbe & Kolbe double hung windows. The most common of the window sashes weighs in at 18 lbs. The dimensions of the parts are shown in the photos.
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Tom from SWISCO responded:
October 11, 2018

Thanks for contacting us. Your pivot shoe looks like our 15-177, which is designed to be used with our Series 152 spring. If your sash weighs 18 pounds, then you'd want to distribute that weight between each spring supporting the sash. I would recommend using one S152-4 (4 pounds) and one S152-5 (5 pounds) on each side of the window. That will add up to 18 pounds of support.
Coil Balance Shoe, Slate Blue
Coil Balance Shoe, Slate Blue
15-177
$3.47
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