Primary and secondary school building evacuation staircase step size
Step width by the table to take, because you did not specify the stairs into the deep, greater than the above table on the line.
Middle school: 3.89 ÷ 0.16 ≈ 25, double run stairs, take 12 +13 level.
Primary school: 3.89 ÷ 0.15 ≈ 26 level, double run stairs, each staircase: 26 ÷ 2 = 13;
