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or abrogation of fire protection and safety systems and devices in existing <br />buildings. These requirements are intended to require that existing buildings <br />which do not comply with these provisions be altered to provide a minimum <br />level of safety as required herein. <br /> <br />17-900.4 Alternative methods and systems: The provisions of this article are <br />not intended to exclude the acceptance and approval of alternative methods and <br />systems if such alternative methods and systems provide equivalent safety to <br />the occupant of the existing buildings. <br /> <br />17-900.5 Responsibility: The owner of the existing building or <br />shall provide and maintain such facilities, equipment and systems <br />ance with these requirements and the fire prevention code. <br /> <br />structure <br />in compli- <br /> <br />SECTION 17 901o0 MEANS OF EGRESS <br /> <br />17-901.1 Number of exits: Every story used for human occupancy, more than <br />two stories above grade, shall be provided with not less than two independent <br />exits. Every story used for human occupancy totally below grade, greater than <br />2,000 square feet (186 m2), shall be provided with not less than two <br />independent exits. <br /> <br />Exceptions: A single exit is acceptable when: <br /> <br />1. The building is equipped throughout with an automatic fire <br /> suppression system and an automatic fire alarm system with <br /> smoke detectors located in all corridors, lobbies and common <br /> <br />2. The building is provided with an automatic fire alarm system <br /> and the exit is a smokeproof enclosure or pressurized stair- <br /> way; or <br />3. An existing fire escape conforming to the building code is <br /> provided in addition to the single exit; or <br />4. The building complies with the requirements of the building <br /> code for buildings with one exit. <br /> <br />17-901.2 <br />assemblies except as provided in Table 17-901.2. <br /> <br />Exit enclosure: All interior exits shall be enclosed with approved <br /> <br />Building use group <br />Business <br /> <br />Education <br /> <br />Factory-industrial, <br /> Storage <br /> <br />Mercantile <br /> <br />Residential -- hotels <br /> <br />Residential -- apartments <br /> <br />Residential -- one and <br /> two family dwellinns <br /> NOTE a. i square foot = <br /> <br /> Table 17-901.2 <br /> ENCLOSURE EXCEPTIONS <br />Exception conditions (NOTE a.) <br />When connecting not more than two floor levels and <br />less that 3,500 square feet per floor, or when <br />connecting not more than three floor levels and the <br />building is equipped throughout with an approved <br />automatic fire suppression system. <br />When connecting not more than two floor levels and <br />the building is equipped throughout with an approved <br />automatic fire suppression system. <br />When connecting not more ~han two floor levels, or <br />when connecting not more than three floor levels and <br />the building is equipped throughout with an approved <br />automatic fire suppression system. <br />When connecting not more than two floor levels and <br />less than 2,000 square feet per floor, or when <br />connecting not more than two floor levels and the <br />building is equipped throughout with an approved <br />automatic fire suppression system. <br />When connecting not more than two floor levels and <br />the building is equipped throughout with an approved <br />automatic fire suppression system. <br />When connecting not more than two floor levels with <br />not more than four dwelling units per floor, or when <br />connecting not more than three floor levels with not <br />more than two dwelling units per floor. <br />Exempt in every case. <br /> <br />0.093 m2. <br /> <br />3O <br /> <br /> <br />