| C | E | F | A | B | D + A | |
| CODE | FLOOR TO FLOOR HEIGHT |
STORAGE LENGTH REQUIRED |
HEIGHT ABOVE LOFT FLOOR REQ. |
MINIMUM HATCH LENGTH |
MINIMUM HATCH WIDTH |
MAXIMUM GOING REQUIRED |
| YAL1/4 | 2.35 - 3.25m | 1.6m | 1,08m | .69m | .54m | 1.35m |
| RAL 1 | 2.29 - 2.54m | 1.15m | .73m | .81m | .56m | 1.31m |
| RAL 2 | 2.56 - 2.82m | 1.38m | .77m | .76m | .56m | 1.29m |
| RAL 3 | 2.84 - 3.09m | 1.62m | .9m | .76m | .56m | 1.35m |
| RAL 4 | 3.12 - 3.40m | 1.62m | .91m | .84m | .56m | 1.49m |
| RAL 5 | 3.42 - 3.66m | 1.77m | 1.07m | 1.016m | .56m | 1.54m |