405.4 - Compartmentation
Compartmentation shall be in accordance with Sections 405.4.1 through 405.4.3.
405.4.1
Number of compartments. A building having a floor level more than
60 feet (18 288 mm) below the finished floor of the lowest level of
exit discharge shall be divided into a minimum of two compartments of
approximately equal size. Such compartmentation shall extend through the
highest level of exit discharge serving the underground
portions of the building and all levels below.
Exception: The lowest story need not be compartmented where the area does not exceed 1,500 square feet (139 m2) and has an occupant load of less than 10.
405.4.2
Smoke barrier penetration. The compartments shall be separated
from each other by a smoke barrier in accordance with Section
710. Penetrations between the two compartments shall be limited to plumbing and
electrical piping and conduit that are firestopped in accordance with Section
713. Doorways shall be protected by fire door assemblies that
are automatic-closing by smoke detection in accordance with Section 715.4.8.3
and are installed in accordance with NFPA 105 and Section 715.4.3. Where
provided, each compartment shall have an air supply and an exhaust system
independent of the other compartments.
405.4.3
Elevators. Where
elevators are provided, each compartment shall have direct access to an
elevator. Where an elevator serves more than one compartment, an elevator lobby
shall be provided and shall be separated from each compartment by a
smoke barrier in accordance with Section 710. Doors shall be
gasketed, have a drop sill and be automatic-closing by smoke detection in
accordance with Section 715.4.8.3.
Notes
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