gwjwbw wrote:I work with duct board for my job, there are different thickness. The way the inside are made, they lose their strenght after a couple of years and you have fiberglass in the air that you breath. I wont put this junk in my own home and wish I could tell customer about it but I may lose my job with my big mouth. If i were you, I use metal duct, unless the duct in a non-condition space such as attic, then you want to wrap the metal duct with duct wrap. Keep in mind, it the air your family breath and they dont tell you that at all.
That my 2 cents!
Too late, my house is already full of it. I am only thinking about adding a stoker furnace into the mix.