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Chapter 3 <br />VENTILATION SYSTEMS <br />SECTION 301 — DESIGN CRITERIA <br />30I.1 Gmenl: The cri�eria of this chapter establish Ihe <br />design conditions upon which lhe minimum ventilation <br />rystems ere �0 6e bnced for ell occupancies. <br />SECTION 3f�2 — MINIMUM VENTILATION <br />CRITERIA FOR ALL GROUP R OCCUPANCIES <br />FOUR STORIES AND LESS <br />302.1 Ceoenl: This seclion shall epply to ell Group R <br />accupancia (nur (4) storia or less as definod by the <br />Washington State Building Code. Residrntiel shuctures <br />�es�or than (our (4) slories in height shell comply wi�h <br />Section 304, for outAcwr eir supply rcquircmmis. For <br />Sou�ct spocific vrnlilffiion rcquiremenls, sa Sxlion <br />302.2.1. Compliance with Ihis section shall be <br />Jemonstreted thmugh enginanng calculetions or <br />perl'ormance testing. Documcntetion of celculations shall <br />bc submitted to the building oflicial where rcquircd. <br />Performance testing shall be conducted in eccordanee wilh <br />recognizult_st melhods. <br />302.1.1 Tatiog: Al the discrction of the building o�ciel, <br />flow testing may be rcquired to verify that the mechanical <br />sys�em(s�satisfiestherequiremrntsof�hissection. Flow <br />tc�sting mey be �eA'ortncd using flow hoods meawring et <br />�he mtaAc •�: exheust points of the syslem, in-line pitol <br />tube, or �.�oblraverse rype measuremcnt systems in the <br />duct, short tcrm tracer gas measuremeNs, or o�her means <br />approved by the building o�cial. <br />3023 Miolmum Ventllalion Perfurmance: Eech <br />dwelling unft or guest room shall be equipped with source <br />srecific end whole house vrnlilation rystems desi�ed and <br />instelled lo satisfy the ventilatlon requiremenls of ihis <br />chapler. <br />k:XCF:I'TION: All public cortiJms shell mal �he <br />vrnGlatiun rcquircmcnts in Smion I2033 nf ihe Unifarm <br />Huilding G�le. <br />302.2.1 tiource Speeillc Ven111�Hoo: Source s�ecific <br />cxheusl vrnlilation shell be «quired in each kilchen, <br />baihrvom, weter closet, laundry room, indoor swimming <br />pool, spa, and other rooms wherc excess weler vepor or <br />cooking oJor is pruduced. <br />'Ihe minimum sourcc specific vmtilation eff�ctive <br />exhaust capacily shell be not las than levels specified in <br />'I'able 3-I. <br />EHeclive 7I01/98 <br />We�Mirpton SteM Ventilation <br />NW InOoor Air Oualiry Cale <br />3021.2 Whole Noux Veotll�tion Systems: Eech <br />dwelling imit shell be equipped with e whole houx <br />ventiletion ryslem which ahail be capeble of providing at <br />least 0.35 Air changn per hour, but not las than � S cubic <br />feet per minute per bedman plus an additional 1 S cubic <br />feel ptt minute. Whole house va�lildion sysletns shell be <br />daigned to limit ventiluion w e Iwel no gruter then 0.5 <br />sir chenga per hour under nortnal nperation conditions. <br />Wholc house ventilation systems shell supply outdoor eir t�> <br />eil habi�able rooms through individuai outdocr air inlMs, <br />forood•air heating system, ducliug or equivalrnt means. <br />Doon end uperobie lita in windows ue damed not to <br />meet Ihe outdaor air supply imeke requircmcnts. <br />E%CF.PfION: �or dNelling uniu of no �m�e then <br />I.400 rquue fed. OK muimw� vrnUlatlon re�e elull be <br />0.65 sir changes per hour. <br />302J Cwtrolc All ventilmion syst«n controls shell bc <br />readi�y aca.ssibla Canuuls fa whole house vrnUletion <br />systems shall be capable of operating the vrntiletion system <br />without energizing other rnergy-consuming eppliences. <br />F.XCF.P170N: Condnunusly apm�od whok hwx <br />vrnlilalion syylems swit� shall nal be �eadily acassible <br />Iry �he oow{wit. <br />3023.1 So�rce Speeilk VntflNb� Sy�temi: Source <br />specific vrntiletion sysums shell be controlled by menual <br />switcha, dehumidistets, tlmas, or other epproved means. <br />3ox.ss �n�ermNte.uy open�ea w�ok xo.0 <br />Vrntl4tloe Syetems: The intcrmittrnUy o�eratod wholc <br />house ventilation systems shall bc oonstructed to heve the <br />capebiliry for contlnuous operation, end sliall hnve a <br />manunl control end an eutomatic control, such m a clock <br />tima. At Ihe time of final inspectian, rhe autome�ic <br />control timet shell be set w operete 1ht whole house fan fa <br />s minimum of eight hours e day. <br />302.� Ndu: W hole hou�e fens lacated faur fcet ur less <br />from the inlerior grille shell have e sone reting of I.S or <br />less meesurcd at 0.1 incha wata gauge. Remotely <br />mounted fans shell be acousticelly iwlated from the <br />structurnl elements af the building and from atuched dud <br />work using insulated tlexible dud or otha approved <br />metcrial. <br />F.XCECflON: Whale haux vm�iletioa systems <br />which e'e iau:�rmkd with faad+tr ha�ing sys�rnu a <br />heatieoovay vmtilstiaa syatana me eacanpl fiom 1he <br />wne raGng nyuimnrn•s of Ihis xctian. <br />�S <br />