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pia FIAEANO SMOKE PROTECTION FEATURES ing members for aminimum distanceof4feet 706,11 Ducts and air transfer openines.Dacs and airLnns- y (1220 rum)on both sides of the-fire wall. fee openings shall notpenetrate-fire walls. 5. 7o buildings designed fa accordance with Section Exception:Penetrations by ducts and air transfer openings 509.2,fre walls located above the 3-hour horizontal of fire waltz that are not on a Lot line shall be allowed aro- assenbly required by Section 509.2,Item I shall be tided the penetrations comply with Section 716. The size permitted to extend from the top of this horizontal and aggregatewidthof all openings shall notexceed the assembly. nations of Section 706.3. 706.6.1 Stepped buildings.Where afire wait serves as an exterior wait for a building and separates buildings having SECTION 707 different roof levels,such wail shall terminate at apoint not less than 30 inches (762 mat) above the lower roof Ievel, FIRE BARRIERS". provided the exterior wall for a height of 15 feet(4572 mu) 707.1 General.Fire barriers installed as required elsewhere in above the lower roof is not less than 1-hour fire-resin this code or the Fire Crate shall comply with this section. lance-rated construction from both sides with openings pro- scred by fire assemblies having a fire protection rating of 707.2 lidaterials.Fire barriers shall be of materials permitted not less than=/,,hour. by the building type of construction. Exception:Where dlefire wall terminates at the under- 7073 Fire-resistance rating.Thefire-restnonce sating of fire side of thereof sheathing,deck or slab of the lower roof, harness shall comply with this section. provided', 707.3.1 Shaft enclosures.Thefire-resistance rating of the • 1. The lower roof assembly within 10 feet(304S arm) hrebarrierseparatingbuildingareasfrostashaftshallcom- of the wall has not less than a 1-hour fire-resin- ply will Section 708.4. - ranee rating and the ease length and spar of sup- 707.3.Ent enclosures.Thefire,resisrance ring of the porting elements for the ramd roof assembly has a fire bartierseparating building areas from an exit del'com- lac-resistance rating of not less than 1 hour. ply with Section 1022.1. 2. Openings in the lower roof shall not be located 707.3.3 Exit passageway.Thefire-resistance raring of the within 10 feet(3048 ram)of the fire wail. fire barrier separating building areas from an exit passage- 4 7u"6.7 Corbpstiblefratningittfine walls.Adjacent combssd_ way shaL'comply with Section 1023.3.80/11 blemembeis entering into aconcretearmasonrvfire well aum 707.3.4 fforzontai exit.The fire-rerinwice rating of the apposite sides snail not have less than a 4-inch(102 rum)dis- separation between building areas connected by a horizon- Mace benveen embedded ends. Wiese combustible members tal exit shall comply with Section 1025.L frame into hollow walls or walls of hollow units,hollow spaces 7073.5 Atriums.Thnirre-re$isrmse rating of the fire har- shen be solidly filled for the full thickness of tbewall and for a her separating atriums shall comply with Section 704.6. distance not less than 4 inches (102 arm) above, below and • between the structural members, with noncombustible materi- 70716 Incidental accessory occupancies. The fire bar- als approved for fueblocking. nier separating incidental accessory occupancies from other spaces in the building shall have afre;resrscance rating of 706.8 Openings.Each opening through afire wail shall bepro- not less than that indicated in Table508.2_5. tected in accordance with Section 715.4 and shall not exceed 156 square feet(15 m2). The aggregate width of openings at 7073.7 Control areas. Fire barrier: separating control any floor level shall not exceed 25 percent of the length of the areas shall have aftre,resstance raring of not'iess than that wall. required in Section 414.2 �mn Exceptions Secti on Separated occupancies.Where the provisions of Section 503:4 are applicable, the fire barrier separating 1. Openings are not permitted in patty stalls constructed mired occupancies shall have afire-resr3lanne rating of not in S.ccordauce with Section 706.1.1. less than that indicated is Iabte 503.4 based on the occupan- 2. Openings shall not be limited to 156 square feet(15 ties being separated m2) where both buildings ate equipped thronghout 707.3.9 ire areas. I e, re amess or horizontal assem- a irh an automatic sprinkler system-installed inaccor- bies, of both,separating a single occupancy into different dance with Section 9033.1.1. fire areas shall bale mire-resistance rating of not less than 706Penetrations. Penetrations of fire wails shall comply that indicated in Table 7073.9.The fie barriers orhon_on- .9706.9 cim 713. rat assemblies,or both,separatiogfnz areas of mixed occu- ith Se panties sbz l have afire-resistance rating nfnet less than the 706.10 Joints-Joints rade in orbetwe:.nfire-.volts shall com- highestvalce indicated in Table 707.3.9 for the occupancies ply with Section 714. under consideration. • • 201h GhEGON STRUCTURAL SPECIALTY CODE 11:19