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7997 Edition <br />J02.S Ventflrt�on Ducte: AII ducts shall �erminatc ouaide <br />thc building. f:zheust ducis in systems which tve designcd <br />to operete inkrtnittrnqy shall be equipped with back-drall <br />dampers. All ezhausl ducts in unconditioned spaces shell <br />be insulated to a minimum of R-4. All supply ducis in Ihe <br />conditioned space shell be insulsled to a minimum of R-4. <br />302.6 Ontdoor Air. A mechnnical system shall supply <br />ouldoor eir as rcquircd in Seci�on 302.2.2. The <br />mechanical system mey consist of exheust fens, supply <br />(ens, or Iwth. <br />302.6.1 Ouldoor Alr Inlels: Inlels shall be scrcened or <br />otherwise prolwt d from entry by insecls, leaves, or othcr <br />ma�eriel. Outdoor air inlets shall be I�cated so as not to <br />lake air from Ihe fullowing areas: <br />a. Closer IhTn 10 feet Gom an opplinnce venl outlet, <br />unlcss such vent oudel is � feet abnve �he ould«>r eir inlet. <br />b. Where it will pick up objeclic nable odors, fumes or <br />Oammeble vyars. <br />c. A he�ardous or unsanitary Iceation. <br />d. A room or space having eny (uel-buming applienccs <br />Iliercin. <br />e. Cloxer �hsn 10 feM from s venl opcning of a <br />plumbing d��inege syslrm imless Ihc vent opening is at <br />Icast J feet above We air inlM. <br />f. Allic, crewl spaccs, or gareges. <br />302.6.2 Indivldu�l Roum Ootdoor Air InINs: Individual <br />nxim outdoor air inlets shell: <br />e. heve conlrolleble end secure opeuings; <br />b. t�e sle�wed or otherwise dcsigned so es nol to <br />compromixe Ihc ihem�el properties of Ihe wall or winUow <br />in which ihcy are pluccd; <br />c. provide not less thm tour syuare inches of nel Gee <br />area of upening for each hebilable space. Any inlel or <br />cumbination of inlets which provide 10 c(m al 10 1'ascals <br />ns dctermined by Ihe Ilome Ventilating Institute Air �low <br />Test Stnndard are deemed equivalent to four squom inches <br />ncl Gee arcu. <br />302.63 Ventll�tlon Inlegnted with Forced-Air <br />System�: The outd�r eir conntttion to Ihc re�um air <br />slream shall bc localnl u{xiream nf lhc fom�d•eir systcm <br />blower end shell nol be connected directly into e fumace <br />cabinet to prcvcnt thermel shcek tn the heat exchanger. <br />302.6.4 Disiributlon: Ouldc�r eir shall bc distributed lo <br />each hebilablc rcx�m by individual inlcts, scparetc du�1 <br />rystiYns, or n forcecl•air systcm. Whcrc outdoor air <br />supplics arc separnicd Gom cxhnusl �x�ints by doors, <br />provisions shall be made to ensure air Ilow by installatinn <br />of dislribution duds, underculting dwrs, instelletion ol' <br />griila, transoms, or similer mcans where permined by ihc <br />Unifomi Bailding Codc. Doors shell be undcrcut to a <br />minimur of onc-half inch xbovc �hc surfacc of the finish <br />Ooor covcrmg. <br />SEC'f10N 30� — MECHANICAL VENTILATION <br />CRITERIA AND MINIMUM VENTILATION <br />PFESCRIPTIVE RE�UIREMENTS FOR ALL <br />GROUP R OCCUPANCIEB FOUR STORIEB AND LESS <br />303.1 Genenl:'Ihis Sectiun ateblishes minimum <br />prescriptive daign requiremenLs for intrnniltently <br />operated systems. Continuously operated sysrems shall <br />comply with Section 302. System characleristics nol <br />eddtessed in Ihe fnllowing seclions shu�l comply with <br />Scction 302. A system which meets the «quircmrnts of <br />lhis seclion shall be damed lo satisfy lhe requiremenb af <br />this chaptcr. <br />303.I.t Souree SpaciOc: 8xhausl fens providing source <br />specific vrn�ilation shall heve a minimum fan Oow reting <br />not Iess thsn SO cfm at 0.25 inches water gauge (or <br />bathrooms, leundri�Y, or similar rooms and 100 cfin et <br />0.25 inches weter gaugo for kitc'�ens. Manufaqurers' (en <br />tlow ralings shall 6e dctcrmined as per H V I 916 (;•dy <br />17R9) or AMCA 210. <br />F:XCEPPION: WM:Ic e mgc had a dmvn drafl <br />exhaus� fen is uud to salisfy �hc snu`cc srecific <br />vrntilmian reyuimnrnls k�r kilchens, lhe range MxKI or <br />Jown drnfl exhauvt ahall not Ae Iess �hen 100 cfin et 0.10 <br />inchct wattt geugc. <br />JOJ.1,2 WAok Iloux: Whole house venti�ation systems <br />may consist of whole houu exhaus4 integation with <br />farced-eir systems or dedicated heat recovery ventilation <br />systems. Whole houu ventilation systems shall provide <br />vrntila�ion capecity as specified in Table 3-2 and meet �he <br />following requircmen�s: <br />a. Gahausl fens providing whole house ventiletion shall <br />have e Ilow rating at 0.25 inches watcr gauge as specificd <br />in Table 3-2. Menufacturers' fen flow ralings shall be <br />dctermined ac per H V1916 (July 1989) or AMCA 210. <br />Table 3-2 shall not be used (or dwclling unils with morc <br />thnn five (5) t�eJrooms. <br />b. Intcgret�d forced-eir ventiletion systcros shell havc <br />nn outdoor air inlel dua connccti�g e tettninal elemcnt on <br />the uutside o(the building to �he retum air plrnum of �hc <br />forced-eir sys�em, at e point within four (4) feet upstream <br />of the air handler, end be cquipped with one of lhe <br />following: <br />I. A mo�orired demper cannected lo the aulometic <br />ventilatiun control ai s�ecified in Sectiun 302.3?: <br />or <br />Elledive 7/01/98 <br />/� <br />