I just had my ducts cleaned (sort of) and discovered that the ductwork is rusted and crumbling in the portion of my house that is on a concrete slab. There is alot of dust (concrete?) in the ductwork and the cleaners could not get it out. They said it just kept coming. Any advice on how to clean and retrofit plastic ductwork into the space OR do we have to get an entirely new system through the attic?
DESPERATELY NEED HELP..