[TR] radiator duct material

[Carl TR]

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