Clean Air Ducts
Although the US Environmental Protection Agency (EPA) does not address duct cleaning, air ducts provide a common harbor and distribution mechanism for biological air contaminants. In many older homes, forced air heaters may have been operated for years with dirty filters or with no filters at all. The accumulated dust on the inner duct surfaces is often oily or moist and may contain mites or various species of molds or fungus. In newer homes, where air-tight construction methods are employed for enhanced energy conservation, the growth of mold spores has become recognized as a significant indoor air quality hazard.
The EPA reports that molds can be found almost anywhere; they can grow on virtually any substance when moisture is present. Molds produce tiny spores to reproduce, just as plants produce seeds. Mold spores waft through the indoor and outdoor air continually. When mold spores land on a damp spot indoors, they may begin growing and digesting whatever they are growing on in order to survive. There are molds that can grow on wood, paper, carpet, foods, even dynamite. When excessive moisture or water accumulates indoors, mold growth will often occur, particularly if the moisture problem remains undiscovered or unaddressed. There is no practical way to eliminate all mold and mold spores in the indoor environment; the way to control indoor mold growth is to control moisture.
Molds can trigger asthma episodes in individuals with an allergic reaction to mold. If mold is a problem in your home, you must clean up the mold and eliminate sources of moisture. Recommendation by your professional inspector to clean you air ducts should be heeded to help provide a safe and healthy home.