Section 6

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All staircases for the use of the public shall be not less than 4 feet 6 inches wide for the use of not more than 300 persons;

Exit staircase shall open directly to the street or to a compound with clear access to the street.

The treads of the staircases shall be not less than 11

No windows or diagonal treads shall occur on any staircase,

All staircase, landings and supports shall be constructed of fire-proof material.