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pi'rectinns-The Minnesota Fuel Gas Code method ta calculoie io siz�of a raqu�red cambvs[ian air opening,is called the Known Air <br /> lrrfiltraiion Rnte M�thod. for new cons#ruttio»,4b of siep 41s reqr�lred ta be ft!!ed out. <br /> IfGC Appendlx E,Workshaet E-1 <br /> Residential Combustton A1r Calculatlon Method <br /> (for�urnate,Boiler,BndJor Weter Neater in the Same 5 aceJ <br /> St�p 1:Cnmplete vented combu�tion appiiance in#ormatfon. <br /> �urnaseJBaller: <br /> _Oraft Haod �, Fan Asststed �Direa Vent Ir�put: 6tuJhr <br /> or power Vent <br /> Water Heatar: <br /> �Draft Waod _ Fan Asslsted ,,,_Otrect Vent Input: Stulhr <br /> or Power Vgnt <br /> 5tap 2:Caiculate tlae vaiume of Lhe Combustion Appilanca Space(CA5)containing combustian appiiantes. <br /> T'ha CAS inciur��s aii spaces co�necied to ana another by cede compilant open gs. CkS voiume: j �� R' <br /> txWKH L � W H <br /> - _ityp3:fletermirre-Air�hangesp�r#iocrr�/k�fi}2 --...__. __.__._ _._. ._ _. ___._. -.---. __._ _......_ __ __� .__....__ ____..._.--:--�_.. :.--: --._. _.._�_.:..... <br /> default ACH values have been incorporated into Table E-1 for use with Methed 4b(KAIR Method�. <br /> ifi the year of constructinn or ACH is not known,use methad 4a Stendard Method. <br /> Step 0:Determine Required Volume#or ComBustion Air,�DO NOT COUNT OIRECT VEtJT AAPUANC£S} <br /> 4a.Standard Method <br /> Total 6tu/hr input of�Il tombusUon appllances lnput: Btu/hr <br /> Us�Standard Method column in Ta61e E-1 La flnd?otai Required TRV: #t' <br /> Valume(TRV} <br /> if CAS Voiume(from 5tep 2�!s qreater thdn 7AV then no outdaor openings ar�needed. <br /> !f�JtS Volume{from Stap 2)is�ess than TRV then go to SPEA 5. <br /> 46.Known Air Ittflltratton Rate(KA1R)Method(b0 idOT COUNT DIRECT VENT APPUANC` <br /> 7atai BtuJtrr Input of ai1 hrnauiatad ond powmr vent appiiances Input:_,t���BtuJhr . <br /> Use�an-Assisted Appliances calumn in Teble E-1 tn flnd RVPA: -���� tt' <br /> R�quirad Volume Pan Assisted(AV�A) <br /> ,,,�,,,,-. <br /> Toqf BtuJhr input af aii Natura!draft appltances Input: Btu/hr <br /> ,�,,f!�' <br /> Use Naturai draft Appliancas column in Table E-1 to flnd RVNFA: j_ �ft' <br /> Requirsd Voiume Naturai draft�ppitanc�(RVNDA) <br /> Totai Requlred Vclume{TR�+RVFA+RVNOA TRV= �� � + ✓ : y` �� � 7RV{�3 <br /> If CAS Valume(�ram St+sp 2)fs brea#ar than TRV then na outdoor apenings are neades3. <br /> !f CAS Voiume #rom Step 2)!s less tfian TRV th�n 'o to STEP 5. <br /> Step 5:Catcuiate the ratlo of avatlab(a interior volume ta the tatat required volume. <br /> Ratio■CAS Voiume{from Step 2)dlvidrd by TRV(from Step 4a or Siep 4bJ -w''" � <br /> a�ei�m ���� � ���`� ��` � <br /> Stap 6:Caltulate Reductian Fattar{Rf). <br /> Rf�1!ltltlYS Rii�O }����_ � a � <br /> Step 7:Laltuiate single cutdoor opening as ifi aii combuatlon air 1s{rom ouuide. <br /> Total Btu/hr input af all Combustton Appiianus in the same CAS Input: _�;�Btulhr <br /> {£XtEPT 01RECT VEN7� <br /> Cambustion Air Opening Area(C,40Aj: <br /> Totai Btu/hr dtWdad 3000 BtuJhr er inY CAOA= �/3000 BtuJtv ar in2* �'"� in; <br /> Step 9:Calculat�Minimum CAOA. <br /> Minimum tAOA s CAOA muh! lted b RF Minimum CApA= �� x m , � in� <br /> Step 9:Calcuiatm Combustian Air Opaning Otameter{tAODj <br /> CA00=1.13 muhJpiled by ihe tquore root of Ivtinimum LAOA CAOD=1.13 V iVitntmum CAOA m !n.diameYer <br /> o up one Inch 3n eize 1f usln tfex duct <br /> 1 If desired,ACH r.�n be determined using A5HRAE caitulaaan or blower door test.Failow procedures in Sectfon <br /> G304. <br /> G:\Forms�VantfvlakupGombAirCaisD41511.docx Page 5 of 6 <br />