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17-901.2.1 Enclosure rating: Enclosures connecting not more than six floor levels shall have a fire resistance rating of not less than 1 hour with approved opening protectives. Enclosures connecting more than six floor levels shall have a fire resistance rating of not less than 2 hours with approved opening protectives. 17-901.3 Exit capacity: The capacity of the exits serving a floor shall be sufficient for the occupant load thereof as determined by the building code. 17-901.4 Corridor enclosure: All corridors serving an occupant load of greater than 30 and openings therein shall provide an effective smoke barrier. All transoms, louvers, doors and other openings shall be closed or shall be self-closing. 17-901.5 Dead end travel distance: All corridors which serve more than one exit shall provide direct connection to such exits. The length of a dead end corridor shall not exceed 35 feet (10668 mm) when the building is not equipped throughout with an automatic fire suppression system. The dead end travel distance limit shall be increased to 70 feet (21336 mm) when the building is equipped throughout with an automatic fire suppression system. SECTION 17-902.0 SHAFTS 17-902.1 Enclosure: All shafts shall be enclosed in accordance with the requirements for exits in Sections 17-901.2 and 17-901.2.1, except elevator and supplemental stairway shafts which are immediately adjacent to and not separated from floor openings connecting the same floors served by the shaft. The opening protectives shall provide a barrier to fire penetration. Building service shafts such as trash chutes, utility and duct shafts shall be enclosed in accordance with the requirements for exits in Sections 17-901~2 and 17- 901.2.1. SECTION 17-903o0 ILLUMINATION AND SIGNS 17-903.1 Egress illumination: All means of egress shall be equipped with artificial lighting in accordance with the requirements for new buildings in the building code. Emergency lighting shall be provided in accordance with the requirements for new buildings in the building code. 17-903.2 Exit signs: All exits shall be indicated with exit signs in accord- ance with the requirements for new buildings in the building code. 17-903.3 Information signs: A sign shall be provided at each floor landing in all interior stairways more than three stories above grade, designating the floor level above the floor of discharge. All elevator lobby call stations on all floor levels in buildings more than 75 feet (22860 mm) above the lowest level of fire department access shall be marked with approved signs reading as follows: Use Stairways in Case of Fire -- Do not Use Elevators. SECTION 17-904.0 FIRE PROTECTION SYSTEMS 17-904.1 High hazard use: All buildings and portions thereof of high hazard use shall be equipped throughout with an approved automatic fire suppression system. 17-904.2 Commercial kitchen exhaust systems: Commercial kitchen exhaust hood and duct systems, other than steam tables, completely enclosed ovens, cooking appliances located within a dwelling unit and not used for commercial purposes and auxiliary cooking equipment that does not produce grease-laden vapors, shall be equipped with an approved automatic fire suppression system. 17-904.3 Fire standpipes: All buildings having floors used for human occupancy located more than six stories above grade shall be provided with standpipes according to the building code. The standpipes shall have an approved fire department connection with hose connections at each floor level. 17-904.4 Smoke detectors: All residential occupancies shall be provided with a minimum of one approved single station smoke detector in the sleeping area, guest room or suite of a hotel, motel, lodging house, boarding house or dwell- ing unit. The detectors shall be located in accordance with the building 31