should you have the air ducts in your home cleaned? http://www.epa.gov/iaq/pubs/airduct.html#what is air duct cleaning
The inside story: A guide to indoor air quality http://www.epa.gov/iaq/pubs/insidest.html
Air Conditioning Contractors of America (ACCA) http://www.acca.org

The National Air Duct Cleaners Association (NADCA) http://www.nadca.com

Duct (HVAC)http://en.wikipedia.org/wiki/Duct_(HVAC)

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