Sash window balance

A quick learner from USA says:
Sash window balance
Channel Balance
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Paul from SWISCO responded:
I would look at our S371-31 channel load balance. I think this could be a good replacement. The spring code was originally 3010 but it looks like they change it to 3030 for a sash weighing 16 through 23 pounds. I recommend that you weigh your sash to confirm.
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