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705.11 —707.1 FIRE-RESISTANCE-RATED CONSTRUCTION 705.11 Ducts and air transfer openings. Ducts and air storage as provided for in Section 415.7.2.1 shall be transfer openings shall not penetrate fire walls. 2 hours,but not less than required by Table 601 for the building construction type. Exception:Penetrations by ducts and air transfer openings of 2. Shaft enclosure shall be permitted to terminate at a fire walls that are not on a lot line shall be allowed provided top enclosure complying with Section 707.12. the penetrations comply with Sections 711 and 715.The size and aggregate width of all openings shall not exceed the lim- 706.5 Exterior walls.Where exterior walls serve as a part of itations of Section 705.8. a required fire-resistance-rated enclosure, such walls shall SECTION 706 comply with the requirements of Section 704 for exterior FIRE BARRIERS walls and the fire-resistance-rated enclosure requirements shall not apply. 706.1 General. Fire barriers used for separation of vertical exit enclosures, exit passageways, horizontal exits, incidental use Exception: Exterior walls required to be fire-resistance areas, to separate different occupancies or to separate a single rated in accordance with Section 1005.3.6.5. occupancy into different fire areas,shall comply with this section. 706.2 Materials.The walls and floor assemblies shall be of 706.6 Openings.Openings in a fire barrier wall shall be pro- materials permitted by the building type of construction. tected in accordance with Section 714. Openings shall be limited to a maximum aggregate width of 25 percent of the 706.3 Fire-resistance rating. The fire-resistance rating of length of the wall,and the maximum area of any single open- the walls and floor assemblies shall comply with this section. ing shall not exceed 120 square feet(11 m2).Openings in exit enclosures shall also comply with Section 1005.3.4. 706.3.1 Vertical exit enclosure.The fire-resistance rating of the separation between building areas and a vertical exit Exceptions: enclosure shall comply with Section 1005.3.2. 1. Openings shall not be limited to 120 square feet(11 706.3.2 Exit passageway.The fire-resistance rating of the m22) where adjoining fire areas are equipped separation between building areas and an exit passageway throughout with an automatic sprinkler system in shall comply with Section 1005.3.3. accordance with Section 903.3.1.1. 706.3.3 Horizontal exit.The fire-resistance rating of the 2. Fire doors serving an exit enclosure. separation between building areas connected by a hori- 3. Openings shall not be limited to 120 square feet(11 zontal exit shall comply with Section 1005.3.5. m2) or an aggregate width of 25 percent of the length of the wall where the opening protective 706.3.4 Incidental use areas.The fire barrier separating assembly has been tested in accordance with ASTM incidental use areas shall have a fire-resistance rating of E 119 and has a minimum fire-resistance rating not not less than that indicated in Table 302.1.1. less than the fire-resistance rating of the wall. 706.3.5 Separation of occupancies.The fire barrier sep- arating mixed occupancies,or a single occupancy into dif- 706.7 Penetrations. Penetrations through fire barriers shall ferent fire areas, shall have a fire-resistance rating of not comply with Section 711. less than that indicated in Section 302.3.3 based on the occupancies being separated. 706.7.1 Prohibited penetrations. Penetrations into an 706.4 Continuity. Fire barriers shall extend from the top of exit enclosure shall only be allowed when permitted by the floor/ceiling assembly below to the underside of the floor Section 1005.3.4.1. or roof slab or deck above and shall be securely attached thereto. These walls shall be continuous through concealed 706.8 Joints. Joints made in or between fire barriers shall spaces such as the space above a suspended ceiling.The sup- comply with Section 712. porting construction shall be protected to afford the required fire-resistance rating of the fire barrier supported except for 706.9 Ducts and air transfer openings. Penetrations by 1-hour fire-resistance-rated incidental use area separations as ducts and air transfer openings shall comply with Sections required by Table 302.1.1 in buildings of Types IIB,IIIB and 711 and 715. VB construction. Hollow vertical spaces within the fire bar- rier wall shall be firestopped at every floor level. SHAFT ENCLOSURES Exceptions: 1. The maximum required fire-resistance rating for 707.1 General.The provisions of this section shall apply to assemblies supporting fire barriers separating tank vertical shafts where such shafts are required to protect open 100 2000 INTERNATIONAL BUILDING CODE®