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FIRE AND SMOKE PROTECTION FEATURES • 708.2 shall be protected in accordance with Sections 713.4.1 have anfrating/T rating of not less than l hour but not through 713.4.2.2. less than the required rating of the floor penetrated. J 713.4.1 Fire-resistance-rated assemblies.Penetrations of Exception: Floor penetrations contained and the fire-resistance—rated floor,floor/ceiling assembly or the located within the cavity of a wall above the floor ceiling membrane of a roof/ceiling assembly shall comply or below the floor do not require a T rating. with Sections 713.4.1.1 through 713.4.1.4. Penetrations in 713.4.1.2 Membrane penetrations. Penetrations of horizontal smoke barriers shall also comply with 713.5. membranes that are part of a horizontal assembly shall 713.4.1.1 Through penetrations.Through penetrations comply with Section 713.4.1.1.1 or 713.4.1.1.2. Where of fire-resistance-rated horizontal assemblies shall com- floor/ceiling assemblies are required to have a fire-resis- ply with Section 713.4.1.1.1 or 713.4.1.1.2. tance rating,recessed fixtures shall be installed such that the required fire resistance will not be reduced. Exceptions: Exceptions: 1. Penetrations by steel, ferrous or copper con- 1. Membrane penetrations by steel, ferrous or duits, pipes, tubes or vents or concrete or copper conduits,pipes,tubes or vents,or con- masonry items through a single fue-resistance- crate or masonry items where the annular space rated floor assembly where the annular space is is protected either in accordance with Section protected with materials that prevent the pas- 713.4.1.1 or to prevent the free passage of flame sage of flame and hot gases sufficient to ignite and the products of combustion.The aggregate cotton waste when subjected to ASTM E 119 or area of the openings through the membrane shall UL 263 time-temperature fire conditions under not exceed 100 square inches (64 500 mm2) in a minimum positive pressure differential of any 100 square feet(9.3 m2) of ceiling area in 0.01 inch(2.49 Pa) of water at the location of the penetration for the time period equivalent to assemblies tested without penetrations. the fire-resistance rating of the construction 2. Ceiling membrane penetrations of maximum penetrated.Penetrating items with a maximum 2-hour horizontal assemblies by steel electrical 6-inch(152 tam)nominal diameter shall not be boxes that do not exceed 16 square inches(10 limited to the penetration of a single fire-resis- 323 tam')in area,provided the aggregate area tance-rated floor assembly,provided the aggre- of such penetrations does not exceed 100 ( j gate area of the openings through the assembly square inches(44 500 mm2)in any 100 square does not exceed 144 square inches (92 900 feet(9.29 m') of ceiling area, and the annular mm') in any 100 square feet (9.3 m2) of floor space between the ceiling membrane and the area. box does not exceed'/a inch(3.2 tam). 2. Penetrations in a single concrete floor by steel, 3. Membrane penetrations by electrical boxes of ferrous or copper conduits,pipes,tubes or vents any size or type,which have been listed as part with a maximum 6-inch (152 tam) nominal of an opening protective material system for diameter,provided the concrete,grout or mor- use in horizontal assemblies and are installed in tar is installed the full thickness of the floor or accordance with the instructions included in the the thickness required to maintain the listing. fire-resistance rating. The penetrating items 4. Membrane penetrations by listed electrical shall not be limited to the penetration of a single boxes of any material, provided such boxes concrete floor,provided the area of the opening have been tested for use in fire-resistance-rated through each floor does not exceed 144 square assemblies and are installed in accordance with inches(92 900 mm2). the instructions included in the listing. The 3. Penetrations by listed electrical boxes of any annular space between the ceiling membrane material,provided such boxes have been tested and the box shall not exceed 4e inch (3.2 mm) for use in fire-resistance-rated assemblies and unless listed otherwise. installed in accordance with the instructions 5. The annular space created by the penetration of included in the listing. a fire sprinkler, provided it is covered by a 713.4.1.1.1 Installation.Through penetrations shall metal eschutcheon plate. be installed as tested in the approved fire-resin- 713.4.13 Ducts and air transfer openings. Penetra- tance-rated assembly. tions of horizontal assemblies by ducts and air transfer 713.4.1.1.2 Through-penetration firestop system. openings shall comply with Section 716. Through penetrations shall be protected by an 713.4.1.4 Dissimilar materials.Noncombustible pene- approved through-penetration firestop system trating items shall not connect o combustible materials l 4 installed and tested in accordance with ASTM E 814 beyond the point of frestopping unless it can be demon- or UL 1479,with a minimum positive pressure differ- strated that the fire-resistance integrity of the horizontal ential of 0.01 inch of water(2.49 Pa).The system shall assembly is maintained. 118 2010 OREGON STRUCTURAL SPECIALTY CODE.