Could it be that the cardboard had separated before it was painted? That
was the case for me. The 'open edge' acted like a wick and pulled the
moisture up into the panel, effectively destroying it form the inside
out....
C
>
> But Terry -- I wonder why yours failed so soon. My ductwork is
> certainly more than 20 years old and looks nearly new. It gets wet
> once in awhile but is painted so it sheds water.
>
> Geo
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