Paul from SWISCO responded:
February 14, 2014
Is the sash exactly 15 pounds? It might go a little over. Personally, I would go with the 2320, since that's what the original builders chose (23 B corresponds to our 2320 option).
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Tom from SWISCO responded:
February 14, 2014
Since it's just under 15 pounds, I would go with 2320, yes. As you can see on the chart under the S351-24, two balances with the 2320 option can hold a window sash weight of 9 through 15 pounds.
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