spiral window balances

A quick learner from Burlington says:
I need 10 spiral window balances that are 28 1/2" but I can't find any. should I get the 28"?

Thank you
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Tom from SWISCO responded:
Hey, Steven. Once upon a time, it was common for spiral balance manufacturers to make balances that ended on the 1/2". Most modern spiral balances made end on a full inch, though. We believe that you should be okay with a 29" long balance. We find rounding up to the next highest inch in these circumstances is the best bet; if you go too short at 28", there's a good chance you won't be able to close your window all the way.
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