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Commont #25 IAMMR Justltlcatlonl i Provide conslruclion delails to show compliance with requirements of CBC Socr/br, 1206.3.2 for hoizontal air lnlake tor oach cout yard tor lhis proiect. Response: Horlzontal alr intake at the bottom of â‚¬ach Level 2 courl ln Building A and B ls provided by way ot the open-ended firsfighter tunnel connecting each court lo at leasl one adjoinlng court(s). CBC Section 1206.3.2 requiros that court endosed on all four sides to ba provided with a horizontal air intake at the botlom of lho court or be adlacent to a yard or publlc way. To comply wlth the lntent of thls seclion, th6 opon-ended lirelighter tunnels will provide an avenua for natural ventilation from an ad,iacent court that is equivalent to the roquked opâ‚¬ning of 10 square feet connected directly to a street or yard. Tho courts ln the prolect buildings are much larger than the minimum dimensions required by Section 1206.3 (i.e. 9' x 16' minlmum dimensions for a S-story court). Courtyards 1 and 2 in Bullding B have approximate dimensions of 62' x 90' where Courtyard 3 has approximate dlmenslons of 48190'. These dimenslons provldo a court area that ls at lâ‚¬ast 30 limos largor than the minimum size court required by CBC Section 1206.3. The largâ‚¬r sizes of th6 courts within the prdect buildings do not havo the same characterisllcs of a smaller four-sided court that can act as a chlmnsy during summer wâ‚¬ather whon lhe bullding mass is heatod from the daytimo sun (referonced attached drawing sh6ot A2.2.1). Additionally, it ls not intended for the courls to functlon as an etlicient sourco of natural ventilation for tho spaces they front (i.e. dwelling unlts, lounges, otc) lh6refore the requirement for having the courts abut a yard or publlc way is less essential. (rirst Poitt Apartments - Santn Ano, CA) those two axll passdgeways show c,fndldncâ‚¬ with tho CBC Soctbn 1021.1. '.. . exft pessagleway on othet ahan levalof exit discharge, shall tomlnate al an exil.'Also, the opening protection in rho 6xit passagaways sha,, comply with Sections 1024.5, 716, and Tablo 716.5 requlromenls. Resoonse: Th6 flreflghtor tunnâ‚¬ls aro providod for riro departmont access to the lnterior courtyards pâ‚¬r OCFA Guideline B-09 hese tunn s are not utilizad as an exit onen t of ths eorass svstam andTelcomo are not reouirod to comolv with the reo UI m ents lor exit oassaoawavs The current agress scheme does not raquire the lntroductlon of exit passageways at the lowest residential level as delin6d in the CBC and as regulated by CBC Section 1024. These tunnels will be refened to as'2-Hour Rated Firefighter Tunnels' ln lleu of'2-Hour lnterior Exit Passageway" as proviously sho\Ml on thâ‚¬ drawings. Per OCFA Guideline B-09, the interior doors opening into the tunnels will be go-minute rated solf- or automatic-closing assemblies, but the ends of each sâ‚¬gment of tunnel that connects the open court yards should not bâ‚¬ requlrod to bâ‚¬ â‚¬ndosed sinc6 the opening is râ‚¬quired for firolighters to conduct thâ‚¬ir oporations, ln addition to the dan ch6ck comment responses abo/e, thâ‚¬ dssign team nrould like to address the disctErge of interior 6xlt stairways at Level l: Eoress Court Condition: The interior exit staaru/â‚¬y identilied as Stair #1 discharges at Level 1 to a p.ivate sidâ‚¬walk located on thâ‚¬ \r,est side of the project that leads to the public way on East First Str8et. The propâ‚¬rty line is locetâ‚¬d approdmately 6.5- feet frorn lhe face of the exterior wall on the ne$ side of the building. As such, this creatas an egress court condition that is less than 1o-feâ‚¬t in width measured bâ‚¬tu,Een thâ‚¬ exlerior wall d the buildng and the p.operty line. See Exhitrit A attached. Page3oa4 I llovsnber 25, 2019 lR6/1 jensenhughc^s.cont