Casey from SWISCO responded:
August 22, 2011
What are the numbers stamped on the actual balance box?
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Paul from SWISCO responded:
August 25, 2011
I tried working with an Andersen contractor to figure out which boxes you need but it is not easy. He could not figure out your 36" x 36-1/2" and he is not positive about your 20-1/2" x 16" window (he believes that one might be our 24-531). You will need to provide the numbers stamped on the box to get definite recommendations to which replacement boxes you need to order.
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