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712.1.3 Escalator openings.
Where a building is equipped throughout with an automatic sprinkler system in accordance with Section 903.3.1.1, vertical openings for escalators shall be permitted where protected in accordance with Section 712.1.3.1 or 712.1.3.2.
712.1.3.1 Opening size.
Protection by a draft curtain and closely spaced sprinklers in accordance with NFPA 13, as modified by Appendix Q of this code, shall be permitted where the area of the vertical opening between stories does not exceed twice the horizontal projected area of the escalator or stairway. In other than Groups B and M, this application is limited to openings that do not connect more than four stories.
712.1.3.2 Automatic shutters.
Protection of the vertical opening by approved shutters at every penetrated floor shall be permitted in accordance with this section. The shutters shall be of noncombustible construction and have a fire-resistance rating of not less than 1.5 hours. The shutter shall be so constructed as to close immediately upon the actuation of a smoke detector installed in accordance with Section 907.3.1 and shall completely shut off the well opening. Escalators shall cease operation when the shutter begins to close. The shutter shall operate at a speed of not more than 30 feet per minute (152.4 mm/s) and shall be equipped with a sensitive leading edge to arrest its progress where in contact with any obstacle, and to continue its progress on release there from.
712.1.4 Penetrations.
Penetrations, concealed and unconcealed, shall be permitted where protected in accordance with Section 714.
712.1.5 Joints.
Joints shall be permitted where complying with Section 712.1.5.1 or 712.1.5.2, as applicable.
712.1.5.1 Joints in or between horizontal assemblies.
Joints made in or between horizontal assemblies shall comply with Section 715. The void created at the intersection of a floor/ceiling assembly and an exterior curtain wall assembly shall be permitted where protected in accordance with Section 715.4.
712.1.5.2 Joints in or between nonfire-resistance-rated floor assemblies.
Joints in or between floor assemblies without a required fire-resistance rating shall be permitted where they comply with one of the following:
1. The joint shall be concealed within the cavity of a wall.
2. The joint shall be located above a ceiling.
3. The joint shall be sealed, treated or covered with an approved material or system to resist the free passage of flame and the products of combustion.
Exception: Joints meeting one of the exceptions listed in Section 715.1.
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