Tom from SWISCO responded:
May 21, 2013
Hey, Matt. Usually a stamp of 24D corresponds to our 2440 option, but you should weigh your window sash and make sure it falls under that range just in case.
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Tom from SWISCO responded:
May 28, 2013
Hey, Matt. According to the weight chart on the page for the S350-25, two balances with the 2440 option can carry a window sash weight of 19 through 24 pounds. It looks like the 2440 is the best option for you.
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