415.11.2 Corridors.

Corridors shall comply with Chapter 10 and shall be separated from fabrication areas as specified in Section 415.11.1.2. Corridors shall not contain HPM and shall not be used for transporting such materials except through closed piping systems as provided in Section 415.11.6.

   Exception: Where existing fabrication areas are altered or modified, HPM is allowed to be transported in existing corridors, subject to the following conditions:

      1.   Nonproduction HPM is allowed to be transported in corridors if utilized for maintenance, lab work and testing.

      2.   Corridors. Corridors adjacent to the fabrication area where the alteration work is to be done shall comply with Section 1020 for a length determined as follows:

         2.1.   The length of the common wall of the corridor and the fabrication area; and

         2.2.   For the distance along the corridor to the point of entry of HPM into the corridor serving that fabrication area.

      3.   Emergency alarm system. There shall be an emergency telephone system, a local manual alarm station or other approved alarm-initiating device within corridors at not more than 150-foot (45 720 mm) intervals and at each exit and doorway. The signal shall be relayed to an approved central, proprietary or remote station service or the emergency control station and shall also initiate a local audible alarm.

      4.   Pass-throughs. Self-closing doors having a fire-protection rating of not less than 1 hour shall separate pass-throughs from existing corridors. Pass-throughs shall be constructed as required for the corridors, and protected by an approved automatic fire-extinguishing system.

415.11.3 Service corridors.

Service corridors within a Group H-5 occupancy shall comply with Sections 415.11.3.1 through 415.11.3.4.

415.11.3.1 Use conditions.

Service corridors shall be separated from exit access corridors as required by Section 415.11.1.2. Service corridors shall not be used as a required corridor.

415.11.3.2 Mechanical ventilation.

Service corridors shall be mechanically ventilated as required by Section 415.11.1.6 or at not less than six air changes per hour.

415.11.3.3 Means of egress.

The distance of travel from any point in a service corridor to an exit, exit access corridor or door into a fabrication area shall be not greater than 75 feet (22 860 mm). Dead ends shall be not greater than 4 feet (1219 mm) in length. There shall be not less than two exits, and not more than one-half of the required means of egress shall require travel into a fabrication area. Doors from service corridors shall swing in the direction of egress travel and shall be self-closing.

415.11.3.4 Minimum width.

The clear width of a service corridor shall be not less than 5 feet (1524 mm), or 33 inches (838 mm) wider than the widest cart or truck used in the service corridor, whichever is greater.

415.11.3.5 Emergency alarm system.

Emergency alarm systems shall be provided in accordance with this section and Sections 415.5.1 and 415.5.2. The maximum allowable quantity per control area provisions shall not apply to emergency alarm systems required for HPM.