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(c) Door openings shall not be less than two feet six inches by six feet six inches and sills shall not be more than nine (9) inches above or below the floor level, Available window openings shall not be less tLan two (2) feet six (6) inches by three (3 ) feet and the sills shall not be more than two (2) feet six (6) inches above the floor level and shall be unobstructed by desks, tables, benches, radiators, etc., thereby giving free exit through corridor to fire escapes, doors, windows, etc. Doors and windows shall be provided with locks easily released from the inside without the use of a key. (d) All doors leading to fire escapes shall swing out in the direction of travel but shall be so hung as not to obstruct any passage on the escape when fully opened. In all new buildings all openings within six (6) feet of fire escapes, stair$ or platforms shall be equipped with fire windows and wired glass or fire doors, both with automatically closing divices. (e) Material and form. All escapes shall be made of wrought iron or steel and shall have platforms at every floor level above the first floor and fixed stairs con. netting platforms. .'here shall be a fixed stair or ladder connectinj the topmost plat. form to the roof and a fixed or drop stairs from the lower platform to the ground. (f) Fire escapes which are not constructed over public streets or alleys may continue to the ground level, in which case they must lead to open courts or passage. ways leading to streets or alleys, and suen courts and passageways shall always be keit clear of obstructions ire escapes constructed over streets and public alleys shall have the lowest portion thereof at least twelve (12) feet above _the, grade. Any fire escape whish does not continue to the ground shall have a protected counter -balanced drop stair at the lowest plat- form. Detailed specifications for fire escaper shall be as follo-vs: CLASS "A". Balconies seating less than 100; School buildings,, Libraries,, and Museums having a capacity of less than 100, CIA S S "17" . Apartment houses, Hotels, and Places of Detention. Hospitals and Asylums. Theatres and Assembly Halls, School Buildings, Libraries, and Mueums. Factories, Office and Mercantile BuSldings. MATERIAL AND .)TRENGTH,, No other material than wrought iron or soft or medium steel shall be used for any part of a fire escape, except for weights, separat6re, and ornaments. No bar material less than 1/4 inch thick Hhall be used in the construction of any fire escape, except for separators, ornaments structural shapes over 3 inches and rigidly built up treads and platforms of approved design. All bolts and rivets, except for ornamental work, shall be not lees than 3/8 inch in diameter. Each part of every fire escape (except counterweigilts for balanced stair- ways) shall be designed and constructed to carry a live load of not less than 60 pounds per square foot of horizontal area over the entire fire excape. Each part of every fire escape shall be designed and constructed in accordance with the require,,,ients an Structural designing except that the unit stresses therein specified shall be reduced by one -.Fourth. (Unit stress table given below). Theminimum sections and sizes specified below shall be increaSed when~ ever necessary so that under full load the allowable unit stresses will not b© exceeded* The following unit stresses (pounds per square inch) shall not be exceeded,, ,