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�� <br /> Directians-The MinResoto Fuel Qos Code method to calcui+ate to size of a requFred combustion air opeMng,ls cafled the Known Air <br /> Inf�ltmtion Rate Method. For nerV coRstructfon,4b of st'ep 4 is requir+ed to Ire flf�d art. <br /> iwc aaae�a��,wor�,ee�E-z, .�osz �= <br /> Residentlal Comb�tion Air Caladatio�l Method <br /> for Furnace,Boiler,and/or Water H in the Same S � <br /> $tep 1;CO(tlpletC ve.mted wmbusrion ppp��ance informatlon. ` . <br /> Furnaae/eoiler. <br /> Draft Hood ,_Fan Assi�ed �Direct Vent �nP�_�`�����+� CITY O F 0 RO NO <br /> or Power Vent <br /> Water Neater. <br /> DraftHood �anAssisted _oirectVem mpur. � �+� <br /> or Power Vent <br /> Step 2:Cala+la�e the volume of the GOmbusdon Appiiance Space(CAS)COntaining tombuSd011 appliatltES. �v�q � <br /> The CAS indudes a0 spaces oonneRed to one armther by code mmpliant openings. GlS volume- <br /> l%WXH L W ►+ 69 x •ZS <br /> Step 3:�ebermine Aar Changes p�HoWr(ACH)1 <br /> Oefeul[AGH values have been incorporated ir+to Tabk E-1 for use with Metfiod 4b(KNR M2thod)• <br /> If the r of wnsductlon or ACH ls not known,use mechod aa(Srdndard Method)- � <br /> Stap 4:Oetermine Required Volume r Com6ustion I►ir.(DO NOT GOUNT DIREGT VENT APPUANCEs? <br /> 4a.Standard Method <br /> Total Btu/hr inp�t af all mmbustlon appiiances �^Pur B�� <br /> Use Sbndard Method�lumn in Tabl!E-1 ta find Total Required �v- � <br /> Vdume(TRVJ <br /> ff U15 Volume tfrom Step 2)is g.+sotrr thon TRW U+en no outdoor openinQs are needed. <br /> It CAS VOlurtle(from Step 2�!sless tl+en T1tv tl�en go to sTEP 5. <br /> 4b.Known Air Infiltration Ra�(KAIR)Method lD0 NOT COUNT DIREC7 VEtJT APP CESj <br /> Totsi Btu/h�input of ap fanassisted snd powar vent apPtiances InPu� v �C.� Btu/hr <br /> Use Fan-Assisted Appl'�antes tolumn i�Table E 1 to flnd �F�56�—� <br /> Required Volume Fan Arsisted(RVFA� <br /> Total Biu/hrinput of aH T�tatural draftl appfiancrs Inpur " Bt�/hr <br /> Use Natural draft Applances mlumn in Tabk E-1 to find RVNFA: g � • <br /> RequFred Volume NaWral dnft applfanoas(RVND�A) <br /> Total ReUuired volume lTRV1=RVFa*Rvnoa ntv=�* = Ov� Tttvv fte <br /> ff cA5 volume(from Step 7a ls greatdr!!mn TRV then no ouhdoor openings ar�e needed. <br /> If CAS Vdume(from Ste 2}is less th'n TRV then o to STFP 5. <br /> Step 5:Caltulate tl►8 ratio of availaWp inteflo�volume to me total requ�red vo�ume- <br /> Ratfo=CAS Velume i�m Step 2j dtNided6y7RV(from SteQ 4a or 5tep 4b) 3�q / b� _ �� <br /> Ratlo= <br /> Step 6:Cakulate Reductlon Factor(RI�. <br /> RF=1 naLfus�tatlo �=1- S <br /> SteP�;Cakvlate single outdoor ope�ing as if ali tombustion air is fi'om outside. �.�,�,,�, B�� <br /> TOtll Btu/hT input cf all Lombustlon Y►pptiances in the same CAS )nput: b � v'''v <br /> (EXCEPT DIRECf V�MI <br /> Combustwn A1r Opening Area(CAOPj): g�p. 6? ' i[{2 <br /> ,vw� �,.a:..,aas a000 Oe,.J�.• �..� cJ►ow� /hr r in�= <br /> Step 8:Cakula�e NqNmum CAOA. <br /> Minlmum CAOA=CAOA m by RF Minimum CAOA= ��`�'Y ► J 7 = ��•� ifl� <br /> Step 9:(:31NI�te Combustion Air Opleni�Diameter(CA00) � � � � � <br /> � <br /> CAOD=1.13 mukiffplFed by the sq�re raDt qf Minfmum CAOA C�°�OD=1.13 v Minimum CAa►= �n-die <br /> up o�e inch in size uf usin flex dutt <br /> l lf deSlred,ACH can be detertntned.using AStiRRE wlwlation or biower doortest Follaw procedures in SecHon G304- <br /> I:�Building\SafetyPotieiesloformation\Current�20161VentMakupCombA1�1520Ib•doCx Page 5 of b <br />