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Tom from SWISCO responded:
March 27, 2017
It really depends on the weight of your sash. It is all too possible to have a balance that is too strong, so you want to avoid that. I recommend weighing your sash on a scale and then choosing the option that covers it. If it's too strong, the window will spring open on its own. If it's too weak, it'll droop down once you let go. Like Goldilocks' porridge, it has to be just right.
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