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IV 385 (a) In the bukldings hereafter erected, except private dwellings, which are used aboie the first floor for business purposes or for public assemblage, or for any purpose 4�atever if over three (3) stories high, the stair shafts shall be separately and continuously enclosed by incombustible partitions. Elevator shafts in all buildings hereafter erected shall be enclosed in the same manner. The partitions shall be con- structer of brick or other fire -resistive material approved by the City Manager or other designated official, and all mortar used in the construction shall be Portland Cement Mortar No hollar partition shall be less than eight (-8) inches thick, and no ot►ier solid parti- tion less than four (4) inches thick. (b) All door openings in elevator and required stair encloures shall be protected by fire doors mounted with wrought iron or ateel hardware and sha,ll be securely attached to the wall or partition, or to substantial incombustible frames anchored thereto. If glass panels be used in such doors, they shall be of wired glass not exceeding seven hundred twenty (720) square inches in area. Interior shaft windows shall not be permitted. (c) Doors opening into stairway shafts shall swing in the direction of exit travel, shall be self-closing and shall be at least forty-fourt44) inches wide. (d) The enclosure walls for all elevators shafts shall extend at least three (3) feet above the roof, and at least three -fourth of the area shall be covered with a skylight constructed as specified in Section 18, See, 18. Skylights over stairway and elevator shafts. Where a stairway, elevator or dumb waiter shaft extends through the roof and is covered by a skylight, the skylight shall be constructed with incombustible frame and sash, glazed with ordinary thin glass, and shall be protected by a galvanized steel wire screen with a mesh not exceeding one inch, and the wire not smaller than No. 12 gauge. The screen s'risll have metal surrports and be placed not less than 6 inches above the skylight. Instead of a skylight, a window may be placed in the side of the shaft above the roof which is farthest remaved from a property line. The window shall have in- combustible frame and sash, and be glazed with thin glass. Sec. 19. Fire escapes from buildinCe of threestories and over. It shall be the duty of the owner of every factory, workshop, mill, sal -Rill or place where the manufacture of goods of any kind is carried on, hotel, school building, college, hospital, orphan asylum, mecaritile establishment and office building of over three stories in height, or where as many as fifteen Persons are employed, lodged, entertained or Iinstructed above the second story of such building, than of three stories in height, and theaters and public places of amusement, regardless of height, to provide for the safe exit of the occupants thereof in case of fire by the erection, construction or maintenance LY in good condition of fire escapes of the mo t improved modern design asdescribed in this SeCtion, The owner of owners of any building uppn which a fire escape is erected shall �eeP the same in good repair and properly painted. (a) Location. All fire escapes shall be 11cated when practicable on dead *all or on a pbir between windows. (b) Fire escapes in new buildings shall be easily accessible from the inside of the building in which they are placed by means of unobstructed corridors or passage - Wags• All doors leading to fire escapes shall have clear wired glass labeled "Fire Escapes" in letters three (3) inches high and shall be provided with locks not requiring keys.