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FIRE-RESISTANCE-RATED CONSTRUCTION 707.2-707.5 <br /> ings and penetrations through floor/ceiling and roof/ceiling 5. A shaft enclosure is not required for floor open- <br /> assemblies. ings complying with the provisions for covered <br /> malls or atriums. <br /> 707.2 Shaft enclosure required. Openings through a 6. A shaft enclosure is not required for approved <br /> floor/ceiling assembly shall be protected by a shaft enclosure masonry chimney, where annular space protec- <br /> complying with this section. tion is provided at each floor level in accordance <br /> with Section 716.2.5. <br /> Exceptions: — (3 5 ExC2PrwAiS 7. In other than Groups I-2 and I-3, a shaft enclo- <br /> 1. A shaft enclosure is not required for openings total- sure is not required for a floor opening that corn- <br /> ly within an individual residential dwelling unit and plies with the following: <br /> connecting four stories or less [4 floor levels]. 7.1. Does not connect more than two stories. <br /> 2. A shaft enclosure is not required in a building 7.2. Is not part of the required means of <br /> equipped throughout with an automatic sprinkler egress system except as permitted in <br /> system in accordance with Section 903.3.1.1 for Section 1005.3.2. <br /> an escalator opening or stairway which is not a 7.3. Is not concealed within the building <br /> portion of the means of egress protected accord- construction. <br /> ing to Items 2.1 or 2.2: 7.4. Is not open to a corridor in Group I and <br /> 2.1. Where the area of the floor opening R occupancies. <br /> between stories does not exceed twice 7.5. Is not open to a corridor on nonsprin, <br /> the horizontal projected area of the <br /> escalator or stairway and the opening is klered floors in any oc�cupau�y. <br /> protected by a draft curtain and closely 7.6. Is separated from floor openings sery <br /> spaced sprinklers in accordance with ing other floors by construction con <br /> NFPA 13. In other than Groups B and forming to required shaft enclosures. <br /> M, this application is limited to open- 8. A shaft enclosure is not required for automobile <br /> ings that do not connect more than four in open parking garages and enclosed <br /> stories. parking garages constructed in accordance with <br /> Sections 406.3 and 406.4,respectively. <br /> 2.2. Where the opening is protected by <br /> approved power-operated automatic 9. A shaft enclosure is not required for floor open- <br /> ings between a mezzanine and the floor below. <br /> shutters at every floor penetrated. The <br /> shutters shall be of noncombustible 10. A shaft enclosure is not required for joint <br /> construction and have a fire-resistance tected by a fire-resistant joint system in accor- <br /> rating of not less than 1.5 hours. The dance with Section 712. <br /> shutter shall be so constructed as to 11. Where permitted by other sections of this code. <br /> close immediately upon the actuation of <br /> a smoke detector installed in accor- 707.3 Materials. The shaft enclosure shall be of materials <br /> dance with Section 907.10 and shall permitted by the building type of construction. <br /> completely shut off the well opening. <br /> Escalators shall cease operation when 707.4 Fire-resistance rating.Shaft enclosures including exit <br /> the shutter begins to close. The shutter enclosures shall have a fire-resistance rating of not less than <br /> shall operate at a speed of not more than 2 hours where connecting four stories or more and 1 hour <br /> 30 feet per minute (152.4 mm/s) and where connecting less than four stories. Shaft enclosures <br /> shall be equipped with a sensitive lead- shall have a fire-resistance rating not less than the floor <br /> ing edge to arrest its progress where in assembly penetrated,but need not exceed 2 hours. <br /> contact with any obstacle, and to con- <br /> tinue its progress on release therefrom. 707.5 Continuity. Shaft enclosure walls shall extend from <br /> the top of the floor/ceiling assembly below to the underside <br /> 3. A shaft enclosure is not required for penetrations of the floor or roof slab or deck above and shall be securely <br /> by pipe,tube,conduit,wire,cabind vents pro- attached thereto. These walls shall be continuous through <br /> tected in accordance with Section 711.4. concealed spaces such as the space above a suspended ceil- <br /> 4. A shaft enclosure is not required for penetrations ing.The supporting construction shall be protected to afford <br /> ducts protected in accordance with Section the required fire-resistance rating of the element supported. <br /> 711.4. Grease uc hall be protected in accor- Hollow vertical spaces within the shaft enclosure construe- <br /> dance with the International Mechanical Code. tion wall shall be firestopped at every floor level. <br /> 2000 INTERNATIONAL BUILDING CODE® 101 <br />