More information about duct cleaning is available from these organizations:
U.S. Environmental Protection Agency Indoor Air Quality Web site -
http://www.epa.gov/index.html
National Air Duct Cleaners Association (NADCA) -
www.nadca.com
North American Insulation Manufacturers Association (NAIMA) -
www.naima.org
Sheet Metal & Air Conditioning Contractors' National Association (SMACNA) -
www. smacna.org