| smacna.org | Sheet Metal and Air Conditioning Contractors' National Association (SMACNA) |
| osha.gov | Occupational Safety and Health Administration (OSHA) |
| nari.org | National Association of the Remodeling Industry |
| iicrc.org | The Institute of Inspection, Cleaning and Restoration Certification |
| iaqa.org | The Indoor Air Quality Association |
| epa.gov | Environmental Protection Agency |
| ashrae.org | American Society of Heating, Refrigerating, and Air-Conditioning Engineers |
| ascr.org | ASCR. Association of Specialists in Cleaning and Restoration |
| acca.org | Air Conditioning Contractors of America |
| aiha.org | American Industrial Hygiene Association |
United States , Virginia , Ashburn