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Professional air duct cleaning performed by a local Plano, Texas company since 2001. The National Air Duct Cleaners Association (NADCA) refers to the venthilation duct system as the lungs of the home, taking air in and blowing air out. Indoor air contains dust, pollen and other pollutants that deposit themselves in the air conditioning and heating duct work. When dust or mold spores build up, it can irritate people who have allergies, sinus or respiratory problems.