Underground garage: 175mm
Residential staircase: 200mm
Commercial staircase: 170mm
Office stairs: 170mm
Hotel stairs: 160mm
Hospital stairs:160mm
Switch to the evacuation staircase: 180mm.
Universities and colleges, etc. :160mm
Middle school stairs: 160mm
Primary school stairs: 150mm
Kindergarten stairs: 150mm
Barrier-free stairs: 160mm