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• FIRE AND SMOKE PROTECTION FEATURES time period equivalent to the fire-resistance rat- 717.7 Flexible ducts and air connectors.Flexible ducts and c ing of the construction penetrated. air connectors shall not pass through any fire-resistance-rated 5. Grille openings located in a ceiling of a fie-resin- assembly. Flexible air connectors shall not pass through any tance-rated floor/ceiling or roof/ceiling assembly wall,floor or ceiling. shall be protected with a listed ceiling radiation damper installed in accordance with Section SECTION 718 717.6.2.1. CONCEALED SPACES 717.6.2 Membrane penetrations. Ducts and air transfer openings constructed of approved materials in accordance 718.1 General.combustible Fireblocking and locationsdra in accordance shall be with the Mechanical Code that penetrate the ceiling mem- installed in combustible concealed in brane of a fire-resistance-rated floor/ceiling or roof/ceiling wnh this section. FirebLo or/ce shall comply with Section assembly shall be protected with one of the following: 718.2.complyDraftstopping in floor/ceiling spaces and attic spaces shad with Sections 718.3 and 718.4, respectively. 1. A shaft enclosure in accordance with Section 713. The permitted use of combustible materials in concealed 2. A listed ceiling radiation damper installed at the spaces of buildings of Type I or II construction shall be lim- ceiling line where a duct penetrates the ceiling of a iced to the applications indicated in Section 718.5. fire-resistance-rated floor/ceiling or roof/ceiling 718.2 Fireblocking. In combustible construction,fireblock- assembly. ing shall be installed to cut off concealed draft openings(both 3. A listed ceiling radiation damper installed at the vertical and horizontal) and shall form an effective bather ceiling line where a diffuser with no duct attached between floors,between a top story and a roof or attic space. penetratesthe ceiling of a fire-resistance-rated floor/ Freblocking shall be installed in the locations specified in ceiling or roof/ceiling assembly. Sections 718.2.2 through 718.27. 717.6.2.1 Ceiling radiation dampers. Ceiling radio- 718.2.1 Fireblocking materials. Fireblocking shall con- tion dampers shall be tested in accordance with Section sist of the following materials: 717.3.1. Ceiling radiation dampers shall be installed in 1. Two-inch(51 mm)nominal lumber. accordance with the details listed in the fire-resistance- 2. Two thicknesses of I-inch(25 mm)nominal lumber rated assembly and the manufacturer's installation with broken lap joints. %4,,,,, instructions and the listing. Ceiling radiation dampers are not required where either of the following applies: 3. One thickness of 0.719-inch(18.3 mm) wood struc- tural panels with joints backed by 0.719-inch (18.3 L Tests in accordance with ASTM E 119 or UL 263 rum)wood structural panels. have shown that ceiling radiation dampers are not necessary in order to maintain the fire-resis- 4. One thickness of 0.75-inch(19.1 mm)particleboard tance rating of the assembly. with joints backed by 0.75-inch (19 mm) particle- board. 2. Where exhaust duct penetrations are protected in 5. One-half-inch(12.7 mm)gypsum board. accordance with Section 714.4.1.2, are located within the cavity of a wad and do not pass 6. One-fourth-inch(6.4 rum)cement-based millboard. through another dwelling unit or tenant space. 7. Batts or blankets of mineral wool, mineral fiber or 717.6.3 Nonfire-resistance-rated floor assemblies. Duct other approved materials installed in such a manner systems constructed of approved materials in accordance as to be securely retained in place. with the Mechanical Code that penetrate nonfire-resis- : tance-rated floor assemblies shall be protected by any of 8. Cellulose insulation installed as tested for the see- the following methods: cific application. 1. A shaft enclosure in accordance with Section 713. 718.2.1.1 Batts or blankets of mineral wool or min- eral fiber.Batts or blankets of mineral wool or mineral 2. The duct connects not more than two stories,and the fiber or other approved nonrigid materials shall be per- annular space around the penetrating duct is pro- mitted for compliance with the 10-foot(3048 nun)hor- tected with an approved noncombustible material izontal fireblocking in walls constructed using parallel that resists the free passage of flame and the prod- rows of studs or staggered studs. ucts of combustion. 718.2.1.2 Unlaced fiberglass. Unfaced fiberglass ban 3. The duct connects not more than three stories, and insulation used as fireblocking shall fill the entire cross the annular space around the penetrating duct is section of the wall cavity to a minimum height of 16 protected with an approved noncombustible mate- inches(406 rum)measured vertically.When piping,con- rial that resists the free passage of flame and the duit or similar obstructions are encountered, the insula- w products of combustion and a fire damper is tion shall be packed tightly around the obstruction. installed at each floor line. 718.2.1.3 Loose-fill insulation material. Loose-fill Exception: Fire dampers are not required in insulation material, insulating foam sealants and caulk ducts within individual residential dwelling units. materials shall not be used as a fireblock unless specifi- 2014 OREGON STRUCTURAL SPECIALTY CODE 151