Air Duct Cleaning and Sealing

Galvanized ducting buried under concrete slabs can collect water, debris or worse. There is an air duct cleaning system that not only cleans your ducts, but coats them with a waterproofing compound. This system uses your existing ductwork, so no need to install new ducts.

Source: http://www.askthebuilder.com/889_Air_Duct_Cleaning_and_Sealing.shtml

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