Division SYMBOLS
United Kingdom
| R | Load-bearing capacity |
| E | Integrity |
| I | Insulation |
| W | Radiation |
| M | Mechanical action |
| C | Self-closing |
| S | Smoke leakage |
| P or PH | Continuity of power and/or signal supply |
| G | Soot fire resistance |
| K | Fire protection ability |
| F1D | Stability duration under constant temperature |
| DH | Stability duration under the standard time-temperature curve |
| F | Functionality of powered smoke and heat ventilators |
| B | Functionality of natural smoke and heat ventilators |