What Stamp for my Series 385 Channel balance

A home owner from Florida says:
My window weight 28 LB, what is option number it right for window weight?.
The channel balance it 30 inch long.
Thank you.
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Paul from SWISCO responded:
Did you see the chart of options we have posted on the S385-30 store page? We show that a stamp of 2940 can support a window sash weight of 23 through 28 pounds. Would that work? If your sash weight goes a little over 28 pounds, then you may want to go with the 2950 instead, which can support 28 through 32 pounds.
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