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See also Section 8.2.
7.1.3.1 Exit Access Corridors
Corridors used as exit access and serving an area having an occupant load exceeding 30 shall be separated from other parts of the building by walls having not less than a 1-hour fire resistance rating in accordance with Section 8.3, unless otherwise permitted by one of the following:
  1. This requirement shall not apply to existing buildings, provided that the occupancy classification does not change.
  2. This requirement shall not apply where otherwise provided in Chapters 11 through 43.
7.1.3.2 Exits
7.1.3.2.1
Where this Code requires an exit to be separated from other parts of the building, the separating construction shall meet the requirements of Section 8.2 and the following:
  1. *The separation shall have a minimum 1-hour fire resistance rating where the exit connects three or fewer stories.
  2. The separation specified in 7.1.3.2.1(1), other than an existing separation, shall be supported by construction having not less than a 1-hour fire resistance rating.
  3. *The separation shall have a minimum 2-hour fire resistance rating where the exit connects four or more stories, unless one of the following conditions exists:
    1. In existing non-high-rise buildings, existing exit stair enclosures shall have a minimum 1-hour fire resistance rating.
    2. In existing buildings protected throughout by an approved, supervised automatic sprinkler system in accordance with Section 9.7, existing exit stair enclosures shall have a minimum 1-hour fire resistance rating.
    3. The minimum 1-hour enclosures in accordance with 28.2.2.1.2, 29.2.2.1.2, 30.2.2.1.2, and 31.2.2.1.2 shall be permitted as an alternative to the requirement of 7.1.3.2.1(3).
  4. Reserved.
  5. The minimum 2-hour fire resistance-rated separation required by 7.1.3.2.1(3) shall be constructed of an assembly of noncombustible or limited-combustible materials and shall be supported by construction having a minimum 2-hour fire resistance rating, unless otherwise permitted by 7.1.3.2.1(7).
  6. *Structural elements, or portions thereof, that support exit components and either penetrate into a fire resistance-rated assembly or are installed within a fire resistance-rated wall assembly shall be protected, as a minimum, to the fire resistance rating required by 7.1.3.2.1(1) or 7.1.3.2.1(3).
  7. Fire-retardant-treated wood enclosed in noncombustible or limited-combustible materials shall be permitted in accordance with NFPA 220.
  8. Openings in the separation shall be protected by fire door assemblies equipped with door closers complying with 7.2.1.8.
  9. *Openings in exit enclosures shall be limited to door assemblies from normally occupied spaces and corridors and door assemblies for egress from the enclosure, unless one of the following conditions exists:
    1. Vestibules that separate normally unoccupied spaces from an exit enclosure shall be permitted, provided the vestibule is separated from adjacent spaces by corridor walls and related opening protectives as required for the occupancy involved but not less than a smoke partition in accordance with Section 8.4.
    2. In buildings of Type I or Type II construction, as defined in NFPA 220(see 8.2.1.2), fire protection-rated door assemblies to normally unoccupied building service equipment support areas as addressed in Section 7.14 shall be permitted, provided the space is separated from the exit enclosure by fire barriers as required by 7.1.3.2.1(3).
    3. Openings in exit passageways in mall buildings as provided in Chapters 36 and 37 shall be permitted.
    4. In buildings of Type I or Type II construction, as defined in NFPA 220(see 8.2.1.2), existing fire protection-rated door assemblies to interstitial spaces shall be permitted, provided that such spaces meet all of the following criteria:
      1. The space is used solely for distribution of pipes, ducts, and conduits.
      2. The space contains no storage.
      3. The space is separated from the exit enclosure in accordance with Section 8.3.
    5. Existing openings to mechanical equipment spaces protected by approved existing fire protection-rated door assemblies shall be permitted, provided that the following criteria are met:
      1. The space is used solely for non-fuel-fired mechanical equipment.
      2. The space contains no storage of combustible materials.
      3. The building is protected throughout by an approved, supervised automatic sprinkler system in accordance with Section 9.7 or the mechanical equipment space is provided with sprinkler protection in accordance with Section 9.7 and provided with complete smoke detection in accordance with Section 9.6.
  10. Penetrations into, and openings through, an exit enclosure assembly shall be limited to the following:
    1. Door assemblies permitted by 7.1.3.2.1(9)
    2. *Electrical conduit serving the exit enclosure
    3. Pathways for devices for security and communication systems serving the exit enclosure, where pathways are installed in metal conduit
    4. *Required exit door openings
    5. Ductwork and equipment necessary for independent stair pressurization
    6. Water or steam piping necessary for the heating or cooling of the exit enclosure
    7. Sprinkler piping
    8. Standpipes
    9. Existing penetrations
    10. Penetrations for fire alarm circuits, where the circuits are installed in metal conduit
  11. Penetrations or communicating openings shall be prohibited between adjacent exit enclosures.
  12. All penetrations in fire barriers separating the exit from other parts of the building shall be protected in accordance with 8.3.4.
  13. Membrane penetrations shall be permitted on the exit access side of the exit enclosure and shall be protected in accordance with 8.3.4.7.
7.1.3.2.2
An exit enclosure shall provide a continuous protected path of travel to an exit discharge.
7.1.3.2.3*
An exit enclosure shall not be used for any purpose that has the potential to interfere with its use as an exit and, if so designated, as an area of refuge. (See also 7.2.2.5.3.)
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