The cut of the stair stringers shall not exceed 7 1/2 inches rise, nor be less than 10 1/2 inches tread. There shall be no flights of stairs of more than 15 or less than three steps between landings.
Every landing shall be at least 4 feet wide. When straight stairs return directly on themselves, a landing of the full . width of both flights, without any steps, shall be provided. The outer line of landings shall be curved to a radius of not less than 2 feet to avoid square angles. Stairs turning at an angle shall have a proper landing without winders introduced at the turn. No door shall open immediately upon a flight of stairs, but a landing at least 2 feet wider than the width of the door opening shall be provided between such stairs and such door. When two side flights connect with one main flight, no winders shall be introduced, and the width of the main flight shall be at least equal to the aggregate width of the side flights.
All inclosed stairways shall have, on both sides, strong hand-rails, firmly secured to the wall, about 3 inches distant therefrom and about 3 feet high above the stairs.
All stairways 8 feet and over in width shall be provided with a central rail of metal or hard wood, not less than 2 inches in diameter, placed at a height of about 3 feet above the centre of the treads, supported on wrought metal or brass standards of sufficient strength, securely bolted to the treads or risers of the stairs; and at the head of each flight of stairs, and on each side of the landing, the post or standards shall be at least 6 feet in height, and the rail shall be secured to the post.
The width of all stairs shall be measured in the clear between the hand-rails.
No winding or circular stairs shall be permitted.
No coil or radiator or floor register shall be placed in any aisle or passageway used as an exit; but all such coils and radiators may be placed in recesses formed in the wall or partition to receive the same.
There shall be at least two 2-inch high-service standpipes on the stage of every theatre, with ample provision of hose nozzles at each level of the stage on each side, and the water shall be kept turned on during the occupation of the building by an audience. The said pipes shall in no case be sealed, and shall have two gates, one above the other, with a proper test or waste valve; the lower gate to be kept open at all times. The proscenium opening of every theatre shall be provided with a 2 1/2 inch perforated iron pipe or equivalent equipment of automatic or open sprinklers, so constructed as to form, when in operation, a complete water curtain for the whole proscenium opening, and there shall be for the rest of the stage a complete system of fire apparatus and perforated iron pipes, automatic or open sprinklers. Such pipes or sprinklers shall be supplied with water by high pressure service, and shall be at all times ready for use.
Every building hereafter erected with a hall or assembly-room to contain a public audience of more than 800 persons, or with more than one superimposed gallery or balcony, shall be of fireproof construction throughout; except that halls or assembly-rooms, the mean level of the main floor of which is not more than 5 feet above the grade of the adjacent street, may have roofs of second class construction.
Every building hereafter erected with a hall or assembly-room to contain an audience of more than 600 persons, the main floor of which is raised more than 15 feet above the level of the principal street upon which it faces, shall be of fireproof construction throughout.
The capacity of a hall or assembly-room shall be estimated on the basis of 6 square feet for each person.
If several halls or assembly-rooms are provided in one building, their aggregate capacity shall be considered as determining whether or not the building shall be of fireproof construction, unless the several halls are inclosed by or separated from each other by fireproof walls, with fireproof doors in the same, in which case the building may be of second class construction.
No existing building shall be altered to contain a hall or assembly-room exceeding the foregoing dimensions, unless the whole building as altered shall conform to the provisions of this act.
All seats in places of public assemblage shall be spaced as hereinbefore provided, and, while such places of public assemblage are occupied by an audience, shall be secured in such manner as will be satisfactory to the building commissioner of the City of Boston. No temporary seats or other obstructions shall be allowed in any aisle, passageway or stairway of a place of public assemblage, and no person shall remain in any aisle, passageway or stairway of any building during any performance.
Every existing building containing a hall or assembly-room to which admission is not free, and to which the provisions of chapter 494 of the acts of the year 1908, relative to the licensing of public entertainments apply, shall have all the ways of egress from such building sufficiently lighted, and lighted in a manner satisfactory to the building commissioner, while the hall or assembly room is occupied by an audience.