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Classification of smoke curtains according with EN 12101-1 due to work time and temperature:
| TEMPERATURE < 600°C | 827°C < TEMPERATURE < 1100°C | |||
| D30 | 30 min | DH30 | 30 min | |
| D60 | 60 min | DH60 | 60 min | |
| D90 | 90 min | DH90 | 90 min | |
| D120 | 120 min | DH120 | 120 min | |
| DA | >120 min | DHA | >120 min | |
