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FIRE AND SMOKE PROTECTION FEATURES TABLE 707.3.9 throughout with an automatic sprinkler system in `+ FIRE-RESISTANCE RATING REQUIREMENTS FOR FIRE accordance with Section 903.3.1.1. BARRIER ASSEMBLIES OR HORIZONTAL ASSEMBLIES BETWEEN FIRE AREAS 2. Openings shall not be limited to 156 square feet(15 OCCUPANCY GROUP FIRE-RESISTANCE RATING(hours) m2)or an aggregate width of 25 percent of the length of the wall where the opening protective is afire door H-1,H-2 4 serving an exit enclosure. F-I,H-3.S-I 1 3 3. Openings shall not be limited to 156 square feet(15 A,B,E,F-2,H-4,H-5, m2)or an aggregate width of 25 percent of the length 1,M,R,S-2 2 of the wall where the opening protective has been U tested in accordance with ASTM E 119 or UL 263 and I I has a minimum fire-resistance rating not less than the fire-resistance rating of the wall. 707.4 Exterior walls.Where exterior walls serve as a part of a 4. Fire window assemblies permitted in atrium separa- required fire-resistance-rated shaft or exit enclosure,or separa- Lion walls shall not be limited to a maximum aggre- lion,such walls shall comply with the requirements of Section gate width of 25 percent of the length of the wall. 705 for exteriorwalls and the fire-resistance-rated enclosure or 5. Openings shall not be limited to 156 square feet(15 separation requirements shall not apply. x m )or an aggregate width of 25 percent of the length Exception: Exterior walls required to be fire-resistance of the wall where the opening protective is afire door rated in accordance with Section 1019 for exterior egress assembly in afire barrier separating an exit enclosure balconies, Section 1022.6 for exit enclosures and Section from an exit passageway in accordance with Section 1026.6 for exterior exit ramps and stairways. 1022.2.1. '( ebarriers shall extend from the top of the 7*r $SYUetie Penetrations offire barriers shall comply oor eel mg assemdy below to the underside of the floor or with Section 713. roof sheathing, slab or deck above and shall be securely 707.7.1 Prohibited penetrations.Penetrations into an exit attached thereto.Such fire barriers shall be continuous through concealed spaces,such as the space above a suspended ceiling. enclosure or an exit passageway shall be allowed only when permitted by Section 1022.4 or 1023.6,respectively. 707.5.1 Supporting construction. The supporting con- struction for a fire barrier shall be protected to afford the 707.8 Joints.Joints made in orbetweenfire barriers,and joints required fire-resistance rating of the fire barrier supported. made at the intersection of fire barriers with underside of the Hollow vertical spaces within a fire barrier shall be floor or roof sheathing,slab or deck above,shall comply with fireblocked in accordance with Section 717.2 at every floor Section 714. level. 707.9 Ducts and air transfer openings.Penetrations in afire Exceptions: barrier by ducts and air transfer openings shall comply with Section 716. 1. The maximum required fire-resistance rating for assemblies supporting fire barriers separating tank storage as provided for in Section 415.6.2.1 SECTION 708 shall be 2 hours,but not less than required by Table 601 for the building construction type. SHAFT ENCLOSURES 2. Shaft enclosures shall be permitted to terminate at 708.1 General. The provisions of this section shall apply to a top enclosure complying with Section 708.12. shafts required to protect openings and penetrations through floor/ceiling and roof/ceiling assemblies. Shaft enclosures 3. Supporting construction for 1-hour fire barriers shall be constructed as fire barriers in accordance with Section required by Table 508.2.5 in buildings of Type 707 or horizontal assemblies in accordance with Section 712, IIB,111B and VB construction is not required to be or both. fire-resistance rated unless required by other sec- tions of this code. 708.2 Shaft enclosure required. Openings through a :Openings in a fire barrier shall be protected floor/ceiling assembly shall be protected by a shaft enclosure in accordance with Section 715.Openings shall be limited to a complying with this section. maximum aggregate width of 25 percent of the length of the Exceptions: wall, and the maximum area of any single opening shall not I. A shaft enclosure is not required for openings totally exceed 156 square feet(15 m2). Openings in exit enclosures and exit passageways shall also comply with Sections 1022.3 within an individual residential dwelling unit and and 1023.5,respectively. connecting four stories or less. Exceptions: 2. A shaft enclosure is not required in a building equipped throughout with an automatic sprinkler sys- I. Openings shall not be limited to 156 square feet (15 tem in accordance with Section 903.3.1.1 for an esca- m') where adjoining floor areas are equipped lator opening or stairway that is not a portion of the 110 2010 OREGON STRUCTURAL SPECIALTY CODE