| # | Organization | Country | Specialty | Web Address |
|---|
| 1 | National Air Duct Cleaners Association (NADCA) | USA | Sheet Metal | Click here. |
| 2 | National Association of Manufacturers | USA | Manufacturer | Click here. |
| 3 | National Electrical Manufacturers Association (NEMA) | USA | Manufacturer | Click here. |
| 4 | National Fire Protection Association (NFPA) | USA | Fire proetection | Click here. |
| 5 | National Insulation Association (NIA) | USA | Insulation | Click here. |
| 6 | National Societies of Professional Engineers (NSPE) | USA | Professional | Click here. |
| 7 | North American Insulation Manufacturers Association (NAIMA) | International | Insulation, Manufacturer | Click here. |
