It's on the outside. Runs from the top of the blower to the ceiling.
I'm guessing sheet. It's like a stiff insulation blanket. Thanks.




Hi Ho Silver wrote:
Is the black on the inside of the duct or on the outside? And is this sheet
metal duct?

wrote in message
ups.com...
We've got central AC with the blower in a closet in the house. Recently
we noticed that where the ductwork heads up into the attic it's all
turning black and looks like it may be mold. We had one AC guy tell us
it would cost over $1000 to clean up.

Is this correct? I don't want to fall victim to a scam. Can we take
care of this ourselves?

Thanks for the input.