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What is the highest height of stair tread?
The maximum height of stair tread is different in different places:

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

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