Window hardware inquiry

A quick learner from Ann Arbor says:
Should the total weight of the springs match the window weight? I purchased 2 152-3 coil springs to replace ones with a CL stamp on the end. The window weighs approx 26lbs, should I get 4 6lb ones?
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Tom from SWISCO responded:
Thanks for posting. Yes, in the case of coil springs specifically, you want to add up the strength of each individual spring. If your sash is 26 pounds, then four 6 pound springs should do it.
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