Pyroxylin plastic in excess of an aggregate of twenty-five (25) pounds, either in the raw state or as a manufactured product and intended for use in further manufacturing processes, shall be stored as follows:
(a) Pyroxylin plastic up to five hundred (500) pounds shall be stored in an approved vented “standard storage cabinet” conforming to the applicable provisions of Section 3129.43(d). No such storage cabinet shall have an aggregate interior volume of more than thirty (30) cubic feet nor shall any cabinet be used to store more than five hundred (500) pounds of pyroxylin plastic or more than two hundred fifty (250) pounds in any one (1) compartment of such cabinet. Not more than five hundred (500) pounds of pyroxylin plastic stored as specified in this subsection (a) shall be contained within any one (1) room, and every such room containing in excess of twenty-five (25) pounds of pyroxylin plastic shall be separated from other rooms or spaces by fire-resistive walls or partitions and floor and ceiling construction having a fire resistance rating of not less than three-fourths (3/4) hour. Interior door openings in such walls or partitions shall be equipped with self-closing fire doors having fire resistance ratings of not less than three-fourths (3/4) hour.
(b) Pyroxylin plastic stored in excess of five hundred (500) pounds in any one (1) establishment shall be stored within a room conforming to the applicable provisions of Section 3129.43(c), and conforming to the following additional requirements:
(1) Such fire-resistive rooms shall not exceed one thousand five hundred (1,500) cubic feet capacity and shall not contain more than ten thousand (10,000) pounds of pyroxylin plastic.
(2) Walls or partitions shall be of incombustible material having a fire resistance rating of not less than four (4) hours.
(3) The floor and ceiling construction shall be of incombustible material and shall have a fire resistance rating of not less than three (3) hours.
(4) All door openings shall be equipped with two (2) fire doors, with one (1) fire door provided on each face of the wall at each door opening. The interior door shall be automatic closing and the outer door shall be of the self-closing swinging type. The aggregate fire resistance rating of the two (2) doors shall not be less than four (4) hours.
(5) Each such room shall be separately fire vented to the outer air with vent or vents having a minimum effective cross-sectional area in the ratio of one hundred forty (140) square inches for each one thousand (1,000) pound capacity. A fire-resistive room of one thousand five hundred (1,500) cubic feet capacity shall have vent openings not less than one thousand four hundred (1,400) square inches in area. Such vents shall be either in the exterior walls, the ceiling or the roof. When located in the ceiling they shall be extended to a safe location above the roof level. All vent openings which face on a street, court or other open space shall be at least fifty (50) feet from other openings not in the same plane.
(6) Horizontal or vertical vent flues inside of a building shall be of construction having a fire resistance rating of not less than four (4) hours; except that vent flues for pyroxylin plastic not exceeding two hundred fifty (250) pounds in aggregate weight may be of sheet metal riveted or otherwise assembled in an approved manner so as to be gas-tight, not lighter than eighteen (18) U.S. gauge, covered with not less than one (1) inch of approved heat insulating material and maintained not less than nine (9) inches from any combustible construction or material.
(7) Each vent opening directly through an exterior wall shall be protected against the weather by a single thickness of glass painted or colored a dark color or by other incombustible fragile material mounted in a sash arranged to open automatically in case of fire, through the operation of an approved releasing device placed inside the sash. The effective cross-section area of a vent opening in an exterior wall shall be deemed to be the total area of glass surface. No pane of glass shall be smaller than two hundred (200) square inches.
(8) Fire-resistive storage rooms shall be equipped with at least one (1) automatic sprinkler for each eight hundred thirty-four (834) pounds of pyroxylin plastic capacity. Whenever such room is divided into two (2) or more compartments at least one (1) automatic sprinkler shall be provided in each compartment. A vault of one thousand five hundred (1,500) cubic feet capacity shall have at least twelve (12) sprinkler heads.
(9) All lights within fire-resistive storage rooms shall be at the ceiling level and shall be operated by a switch located outside of such rooms.
(Ord. No. 991-49. Passed 6-27-49, eff. 6-27-49)