1.
A shaft enclosure is not required for openings totally within
an individual residential dwelling unit and connecting four
stories or less.
2.
A shaft enclosure is not required in a building equipped
throughout with an automatic sprinkler system in accordance
with Section 903.3.1.1 for an
escalator opening or stairway that is not a portion of the
means of egress protected according to Item 2.1 or 2.2:
2.1.
Where the area of the floor opening between stories does
not exceed twice the horizontal projected area of the
escalator or stairway and the opening is protected by
a draft curtain and closely spaced sprinklers in accordance
with NFP A 13. In other than Groups Band M, this application
is limited to openings that do not connect more than four
stories.
2.2.
Where the opening is protected by approved power-operated
automatic shutters at every penetrated floor. 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
907.11 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.
3.
A shaft enclosure is not required for penetrations by pipe,
tube, conduit, wire, cable and vents protected in accordance
with Section 712.4.
4. A shaft enclosure is not required for penetrations
by ducts protected in accordance with Section
712.4. Grease ducts shall be protected in accordance
with the International Mechanical Code.
5. In other than Group H occupancies, a shaft
enclosure is not required for floor openings complying with
the provisions for atriums in Section
404.
6. A shaft enclosure is not required for approved
masonry chimneys where annular space protection is provided
at each floor level in accordance with Section
717.2.5.
7. In other than Groups I-2 and I-3, a shaft
enclosure is not required for a floor opening or an air
transfer opening that complies with the following:
7.1.
Does not connect more than two stories.
7.2. Is not part of the required means of egress system,
except as permitted in Section 1020.1.
7.3. Is not concealed within the building construction.
7.4. Is not open to a corridor in Group I and R occupancies.
7.5. Is not open to a corridor on non sprinklered floors
in any occupancy.
7.6. Is separated from floor openings and air transfer
openings serving other floors by construction conforming
to required shaft enclosures.
7.7. Is limited to the same smoke compartment.
8.
A shaft enclosure is not required for automobile ramps in
open and enclosed parking garages constructed in accordance
with Sections 406.3 and 406.4,
respectively.
9. A shaft enclosure is not required for floor
openings between a mezzanine and the floor below.
10. A shaft enclosure is not required for joints protected
by a fire-resistant joint system in accordance with Section
713.
11. A shaft enclosure shall not be required for floor openings
created by unenclosed stairs or ramps in accordance with
Exception 8 or 9 in Section 1020.1.
12. Floor openings protected by floor fire doors in accordance
with Section 711.8.
13. Where permitted by other sections of this code.
