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Where the aggregate Group R-2 occupancy accessory area of all rooms, areas or spaces, including outdoor spaces that are not provided with independent means of egress and that do not converge into interior means of egress, exceed 50 percent of the building area of the story in which they are located, and the total number of occupants on such story exceeds 150 persons, the following conditions shall apply:
  1. The interior corridors or portions thereof serving such accessory spaces shall be constructed as public corridors in accordance with Table 1020.1.2 with 1-hour fire-resistance-rated fire barriers, and 2-hour fire-resistance-rated fire barriers where a dead-end corridor exceeds 40 feet (12 192 mm) in length;
  2. Access to the corridors shall be limited to those necessary for exit access through the corridor from normally occupied spaces. Direct openings from the mechanical, electrical and other storage spaces shall not be permitted, except that access to the corridor may be provided through a vestibule constructed with fire barriers, with a minimum fire-resistance rating consistent with the required hourly rating for the corridor;
  3. Corridors or portions thereof serving such accessory spaces shall be sufficient to accommodate a total occupant load on the basis of 3 square feet (0.28 m2) per person;
  4. The minimum dimension of such corridors shall be sufficient to accommodate the total occupant load discharging into such corridors, but shall in no case be less than 5 feet (1524 mm) in minimum dimension; and
  5. In addition to Conditions 1 through 4 above, one of the following conditions shall be met:
    1. Each of the interior exit stairways and ramps serving such story shall be protected by a smokeproof enclosure in accordance with Section 909.20;
    2. The corridor or portions of the corridor serving the rooms, areas or spaces that are accessory to the Group R-2 occupancy shall be pressurized in accordance with requirements that are applicable to interior exit stairways. Connecting interior exit stairways need not be pressurized unless otherwise required by this code;
    3. All passenger elevators serving the rooms, areas, or spaces that are accessory to the Group R-2 occupancy shall comply with occupant self-evacuation elevator requirements in Section 3008.1 through 3008.11; or
    4. One additional exit stairway meeting the requirements of Sections 1009 and 1023 shall be provided in addition to the minimum number of exits required by Section 1006. The total width of any combination of remaining exit stairways with one exit stairway removed shall not be less than the total width required by Section 1005.3.
Rooms, areas or spaces that do not comply with the conditions in Sections 1004.1.1.2.1 and 1004.1.1.2.2, or Section 1004.1.1.2.3 where applicable, shall have occupant loads calculated cumulatively per story and be classified as Occupancy Group A.

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