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driving time of fire apparatus from the fire station serving those particular districts; or areas determined by the Fire Chief to be either high hazard areas or extreme hazard areas based on steepness of slope and/or fuel loadings from combustible plant materials as set forth in the Safety Element of the General Plan. 5. In every story or basement of all buildings when the floor area exceeds 1,500 square feet (139.4 m2) and there is not provided at least 20 square feet (1.86 m2) of opening entirely above the adjoining ground level in each 50 lineal feet (15 240 mm) or fraction thereof of exterior wall in the story or basement on at least one side of the building. Openings shall have a minimum dimension of not less than 30 inches (762 mm). Such openings shall be accessible to the fire department from the exterior and shall not be obstructed in a manner that firefighting or rescue cannot be accomplished from the exterior. When openings in a story are provided on only one side and the opposite wall of such story is more than 75 feet (22 860 mm) from such openings, the story shall be provided with an approved automatic sprinkler system, or openings as specified above shall be provided on at least two sides of an exterior wall of the story. If any portion of a basement is located more than 75 feet (22 860 mm) from openings required in this section, the basement shall be provided with an approved automatic sprinkler system. 6. At the top of rubbish and linen chutes and in their terminal rooms. Chutes extending through three or more floors shall have additional sprinkler heads installed within such chutes at alternate floors. Sprinkler heads shall be accessible for servicing. 7. In rooms where nitrate film is stored or handled. 8. In protected combustible fiber storage vaults as defined in the Fire Code. 9. Throughout all buildings with a floor level with an occupant load of 30 or more that is located 55 feet (16 764 mm) or more above the lowest level of fire department vehicle access. EXCEPTION: 1. Airport control towers. 20.24.090 CFC Sections 903.2.1 Group A. through 903.2.17 -Fixed guideway transit systems. Delete these sections. 20.24.100 CFC Section 903.3.1.1.1 -Exempt locations. Sections 903.3.1.1.1.3 and Section 903.3.1.1.1.4 are deleted. 20.24.110 CFC Section 903.3.1A added -NFPA 13 sprinkler systems. CFC Section 903.3.1A is added. Section 903.3.1 A 1. This Section applies to all new and existing buildings. 84