2. 1. 14 safety exit

Stairwells for safe evacuation of people, entrances and exits of outdoor stairs or exits directly leading to indoor and outdoor safety areas.

2. 1. 15 Close the stairs

A stairwell with isolation facilities at the entrance to prevent smoke and hot air from entering.

2. 1. 16 smoke-proof stairs

Staircase is equipped with smoke-proof front room and other facilities at the entrance of stairwell to prevent smoke and hot air from entering.

2. 1. 17 open stairwell is not closed.

A stairwell with no separation facilities at the entrance of the stairwell.

2. 1. 18 evacuation corridor

Smoke-proof facilities shall be set up, and both sides shall be separated by solid firewalls for safe passage of personnel to outdoor walkways.