Tilt window coil balance spring

A home owner from Philadelphia, Pa says:
What is the formula used to determine the correct tilt window coil balance spring weight, i:e: as you would by weighing the window on a weight scale ?, Thank you
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Paul from SWISCO responded:
Yep, you would weigh the sash on a scale and then divide that by how many springs you have in the window. For example, if you had four springs total (two on each side) and a 12 pound sash, you would want four 3 pound springs.
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