Fire stage | Heat (kW∙m−2) | Max temp (˚C) | Oxygen (%) | Equivalence ratio ɸ | VCO/ | Combustion efficiency (%) | ||
| Fuel | Smoke | In | Out |
| |||
Non-flaming | ||||||||
1a. Self-sustained smouldering | n.a. | 450 - 800 | 25 - 85 | 20 | 0 - 20 | - | 0.1 - 1 | 50 - 90 |
1b. Oxidative, external radiation | - | 300 - 600 |
| 20 | 20 | - |
|
|
1c. Anaerobic external radiation | - | 100 - 500 |
| 0 | 0 | - |
|
|
Well-ventilated flaming | ||||||||
2. Well-ventilated flaming | 0 - 60 | 350 - 650 | 50 - 500 | 20 | 0 - 20 | <0.7 | <0.05 | >95 |
Under-ventilated flaming | ||||||||
3a. Low vent. room fire | 0 - 30 | 300 - 600 | 50 - 500 | 15 - 20 | 5 - 10 | >1.5 | 0.2 - 0.4 | 70 - 80 |
3b. Post-flashover | 50 - 150 | 350 - 650 | >600 | <15 | <5 | >1.5 | 0.1 - 0.4 | 70 - 90 |