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• FIRE AND SMOKE PROTECTION FEATURES SECTION 710 SECTION 711 thr I SMOKE BARRIERS SMOKE PARTITIONS 710.1General.Smoke barriers shall comply with this section. 711.1 General. Smoke partitions installed as required else where in the code shall comply with this section. 710.2 Materials.Smoke barriers shall be of materials permit- 711.2 Materials.The walls shall be of materials permitted by ted by the building type of construction. the building type of construction. 710.3 Fire-resistance rating.A 1-hour fir resistancerating 711.3 Fire-resistance rating.Unless required elsewhere in the is required for smoke barriers. code,smoke partitions are not required to have afire-resistance rating. Exception: Smoke barriers constructed of minimum 0.10-inch-thick(2.5 tom)steel in Group I-3 buildings. 711.4 Continuity.Smoke partitions shall extend from the top of the foundation or floor below to the underside of the floor or 710.4 Continuity. Smoke barriers shall form an effective roof sheathing, deck or slab above or to the underside of the membrane continuous from outside wall to outside wall and ceiling above where the ceiling membrane is constructed to from the top of the foundation or floor/ceiling assembly below limit the transfer of smoke. to the underside of the floor or roof sheathing, deck or slab 71/5 Openings.Windows shall be sealed to resist the free pas- above,including continuity through concealed spaces,such as sage of smoke or be automatic-closing upon detection of smoke. those found above suspended ceilings, and interstitial strut- Doors in smoke partitions shall comply with this section. tural and mechanical spaces.The supporting construction shall be protected to afford the required fire-resistance rating of the 711.5.1 Louvers. Doors in smoke partitions shall not wall or floor supported in buildings of other than Type IIB,111B include louvers. or VB construction. 711.5.2 Smoke and draft control doors. Where required Exception:Smoke-barrier walls are not required intersti- elsewhere in the code,doors in smoke partitions shall meet tial spaces where such spaces are designed and constructed the requirements for a smoke and draft control door assem- with ceilings that provide resistance to the passage of fire bly tested in accordance with UL 1784.The air leakage rate and smoke equivalent to that provided by the smoke-barrier of the door assembly shall not exceed 3.0 cubic feet per min- walls. ute per square foot(0.015424 m'/(s-m2))of door opening at 44hoy 0.10 inch(24.9 Pa)of water for both the ambient tempera- 710.5 Openings. Openings in a smoke barrier shall be pro- tore test and the elevated temperature exposure test.Installa- tected in accordance with Section 715. tion of smoke doors shall be in accordance withNFPA 105. Exceptions: 711.53 Self-or automatic-closing doors.Where required elsewhere in the code, doors in smoke partitions shall be I. In Group 1-2,where doors are installed across corri- self-or automatic-closing by smoke detection in accordance dors,a pair of opposite-swinging doors without acen- with Section 715.4.8.3. ter mullion shall be installed having vision panels with fire-protection-rated glazing materials in 711.6 Penetrations and joints.The space around penetrating fire-protection-rated frames, the area of which shall items and in joints shall be filled with an approved material to not exceed that tested.The doors shall be close fitting limit the free passage of smoke. within operational tolerances, and shall not have 711.7 Ducts and air transfer openings.The space around a undercuts in excess of V4 inch,louvers or grilles.The duct penetrating a smoke partition shall be filled with an doors shall have head and jamb stops, astragals or approved material to limit the free passage of smoke.Air trans- rabbets at meeting edges and shall be automatic-clos- fer openings in smoke partitions shall be provided with a smoke ing by smoke detection in accordance with Section damper complying with Section 716.3.2.2. 715.4.8.3. Where permitted by the door manufac- Exception:Where the installation of a smoke damper will turer's listing, positive-latching devices are not required interfere with the operation of a required smoke control sys- tem in accordance with Section 909, approved alternative 2. In Group 1-2, horizontal sliding doors installed in protection shall be utilized. accordance with Section 1008.1 4.3 and protected in accordance with Section 715. 710.6 Penetrations.Penetrations of smoke barriers shall com- SECTION 712 ply with Section 713. HORIZONTAL ASSEMBLIES 712.1 General.Floor and roof assemblies required to have a 710.7 Joints.Joints made in or between smoke barriers shall fire-resistance rating shall comply with this section. comply with Section 714. Nonfrre-resistance-rated floor and roof assemblies shall com- 710.8 Ducts and air transfer openings. Penetrations in a ply with Section 713.4.2. smoke barrier by ducts and air transfer openings shall comply 712.2 Materials. The floor and roof assemblies shall be of with Section 716. materials permitted by the building type of construction. 2010 OREGON STRUCTURAL SPECIALTY CODE 115