Why can not the evacuation door be on the stairs?
3, the building in the closed staircase, smoke staircase, fire elevator front room and the former room, should not set the shutter doors.
2, evacuation staircase and evacuation channel on the ladder should not use spiral staircase and fan step. When must be used, the upper and lower levels of the formation of the plane angle should not be greater than 10 °, and each step from the handrail 25cm stepping depth should not be less than 22cm;
The evacuation door can not be on the stairs, in order to prevent the staff from falling down the stairs.
1, in addition to evacuation door, the stairs around 2.0m wall should not be set on the door and window openings. Evacuation doors should not be on the stairs;
