Links
| Hollow Metal Manufacturers Association (HMMA) | Hollow Metal Manufacturers Association (HMMA) |
| Steel Door Institute (SDI) | Steel Door Institute (SDI) |
| Door Hardware Institute (DHI) | Door Hardware Institute (DHI) |
| The Guild of Architectural Ironmongers (GAI) | The Guild of Architectural Ironmongers (GAI) |
| European Standards (EN) | European Standards (EN) |
| National Fire Protection Association (NFPA) | National Fire Protection Association (NFPA) |
| American National Standards Institute (ANSI) | American National Standards Institute (ANSI) |
| American Society for Testing and Materials (ASTM) | American Society for Testing and Materials (ASTM) |
| National Association of Architectural Metal Manufacturers (NAAMM) | National Association of Architectural Metal Manufacturers (NAAMM) |
| Warnock Hersey Mark (WH) | Warnock Hersey Mark (WH) |
| Lloyd’s | Lloyd's |
| UL | UL |
| Builders Hardware Manufacturer Association (BHMA) | Builders Hardware Manufacturer Association (BHMA) |
| Interteck Services (ITS) | Interteck Services (ITS) |
| British Standards Instituite (BSI) | British Standards Instituite (BSI) |