Sash weigh range question

A home owner from USA says:
I have 5 windows to repair using S385-29. the channels are all marked 28D, corresponding to your 2840. However the weights of the windows are 3 at 25lbs,1 at 19 & 1 at 17. Should I still go with 2840 for all?
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Tom from SWISCO responded:
No, the 2840 is not applicable for those two other sashes. The 2830 option would be what you want.
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