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Diredions-The Minnesoia fuel Gas Code method to�o���4!s requlred to be��ed out.ustton air opening,is Cplled the Known AU <br /> Infiltmtfon Rate Method. For new mnstruttio�.4b of�p <br /> IFGC Appendix E,Workstieet E-1 <br /> Reside0tial CombustlOn Alr Caltula[ion Method <br /> �for Fumue,Boi�er,and/or Water Heater In the Same S ace <br /> Step 1:CompleK v�nteA combustton appliance information. <br /> Pumace/Boiler: in „t: Dd an,/n� <br /> DroR Nood F�n Assisted �Dvec[Vent P <br /> orPowerVent <br /> WatC�HCdtE�: �/ Input: 7 t�V f�l> Btu/hr <br /> D2RHood l'�f2nA5515ted _Direccvent <br /> or Power Vent <br /> StEp Z:C31Cula[e the v0lume of the Combustion Appliante Space(CASI�a�taining wmbu#ion appl'un���ume ���ft, <br /> Thp CAS inClutlES 211 Spa[es connecteC to one anothar by cod�coIJmPH���t op����L W H 3 70}X <br /> St�p 3:Det¢rm�ne Air ChanQeS pet HOur�ACH�1 <br /> Defaul[ACH velues have been incorporated into Tabk E-1 for use with MNhoO 3b{ICAIR Methotl). <br /> If tht �if Of[OOSCNRion cr A�H B no[knwn+.use method 4a(Staodard MBthOd. <br /> St@p 4:DEtBffflill!A2qU1fCd VdUIi12}Of�AITIbuS[i011 Alf•(DO NOT COUNT DIRECT VEN7 APiLUNCES) <br /> 4�i.5[andard Method ��P�t_ Btu/hr <br /> Tot21 BtulBr inputof a0 comWsiion app�+ances TR� ft� <br /> Use Standard Method mlumn in TaWe E-i to find rowi neqwred <br /> Volume 4TRv) <br /> If CAS volume(from SceP 21 V prc�rlhan TRV then no outdoor openings are needed. <br /> if CAS Volume 1�^5up z)u f�r than TRv then go to sTEP 5. <br /> 4y.Koown Air infiftr3tion Rate(KAIR)Method(DO NOT COUNT DIRECT VENT APPLI� �� Btu/hr <br /> Totel Btu/hr Input of all hn-�ssiRed and PoWo�veM app��aMeS ��P�� <br /> Use Fan-Assisted APPllan[es column in Table E-1 to find <br /> RVFa j�SC� e' <br /> Raquired vWume Fan Assisted(RVFA) f� <br /> Inpui: <br /> �'� Btu/hr <br /> TOt21 BTU/hr input ot all Natural dnfc epplisnca � <br /> Use Naturol dnft Appliance5[alumn in Tabk E-i co flnd <br /> RVNFA: n� <br /> RequVred volume Naturol drak apd�a��(�NDA� <br /> U s�'��U Tavft' <br /> TOtaIR2qWretlVOlumC(TRV)=RVfA+RVNDA TRV=��3 � <br /> if Cns voiume Ifrom 5[ep 2!is prmter than TRV then no autdoor openings are needee. <br /> If CAS Valume(from Step 2)Ja less thon TRV thm o to STfiD S. <br /> Step 5:Calculate the rztio of avalWble Intenor volume to tl+e mcal rcqu�rcd vdume. 3.7 U� �o��`�' � <br /> Ratio=Cn5 volume�from Step 1)dlvlded bY TNV(from Step 4a or step 4b) Ratio= I <br /> Step 6:C21cu1Bte ReduRlon FaRor IRF). y � <br /> RF=1- e E + <br /> RF=1 inlnus Ratlo <br /> St�p 7:Calculate single outdoor openlnB as if all comburtfon afr Is from oatside. 7y��j gtu/hr <br /> Totel Btultif 4nput of a�l CombusBon npp0ances in tha same CAS <br /> InpuC <br /> �EXCEPT DIRECT VENT) <br /> Combustion Alr OpeningArea(CAON� ���(y(,j - �K��%� In' <br /> Total Btu/nr dlvidetl 3000 B�+/hr a in' fAOA-7 /3U0�BN/hr r in'- <br /> Step 8:Calculate tulinimUm UiOA. 3 _ �,� <br /> / i <br /> RF Minimum GOA=� ��p x �� <br /> Minlmum CAOA=CAOA multJpued �� <br /> Step 9:Calculate Combustion Air OpeNng Dlameter�CAODI '`�3 X �,Z Z ({�� t� <br /> ln.dro T <br /> CAOD�113 mukipYrd bY�s9�°��O°t°f Minlmum CAOA CAOD=1.13 V MfnlmUm UOA��_. <br /> o up one Inch in size if usin fla duct <br /> 1 If desired,ACH an be detertnined us�nB ASHRAE pkulation or blower door tart.Foilow procedures in Sec[ion <br /> G304. <br /> Page 5 of 6 <br />