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Direc[ions-The Minnesoto Fuel Gos Code rr�ethod to calarlate fo size of a required combustion air openinQ is called the lGrown Air <br /> lnfiltrotion Rate Method. For new constroction,4b of step 4 Is required to be fflled ooL <br /> IFGCAPP��E.Worksheet E-1 . <br /> Residentiai Combusdon AlrtaiculaUon Method <br /> (for Furnaoe Boiler,and/or Waier Heater in the Same Space ' <br /> .' Step 1:Complete�remed combtstlon aPPHarue infortnation. <br /> wmau/soiier: �[ <br /> _Oraft Hood Fan Assisted /�ired Vent' Inp�;�� , B�r • � <br /> or Power VeM �� <br /> WaterHeater. <br /> DraR Flood _Fan AssTsied _Direct VeM Inpyt; gt�� ( ��l�;J''' �/ <br /> ar Power Verrt LJ <br /> Step 2:Calailate the vdume of the Comburtion Apppance SPace(CAS)containing wmbustbon appliances. ,�7�j <br /> The fAS indudes aN spaces mnneued to one another by code compliant openings, CAS volume- V L� 3 <br /> LxWzH L W H � <br /> Step 3:Detertnine AirU�anges per iio,x(p,(�i)1 <br /> Oefauh AGi vatues have peen¢�mrporated into Tab1e E-1 for use with Metlwd 4b(KAIR Metlwd). ��� <br /> If the ear of mratnM(on orACHu not known,use metlwd 4a(Standard MetFwd_ <br /> S�p 4:Determine Req�red Volume forCombustton Air.(DO Npr COUN7 DIRECT VENTppp�pp��) <br /> 4a.5ta�ard Method Q�J� <br /> Total Btu/hr input of ali[omb�stlpo apP6ance, Inpt�C}✓tU�� Btu/hr <br /> Use Standard Metlwd wlumn inTable E-lto find Totai Required 'iRV:� ft' <br /> Voinme('fR� � , <br /> If CAS Voiume(frpm Step 2)is greater t/wn 77{V then no outdoor openings are needed. <br /> If CAS Volume(from Step 2)is less than TRV then go to STEP 5. � <br /> 4b.Known Air In#iltration RaLe{KAIR)Method(DO NOT COUNT DIRECT VENTqpPl1ANCE5� <br /> " Total Btu/hr input of ap fan-assimd and powa vent applYances input: g���� � <br /> Use Fan-Assisted Appltances cotumn in Table E-1 to find RVfA: ' h� � <br /> Requtred Volume Fan Assisted(RVFA) � <br /> 7opl B W/hr input of aU Natun!drait apppar�es y ���� �u� <br /> Use Natural draRApppances column 1nTabfe E-1 w find RyNFp: fta <br /> � Ftequired Votume Naturat draft appliar�ces(RVNDA) - <br /> �� Total Requfted Volume(TR1I�=RVFq+RyNDq 'I7ty���+ - TRV ft; <br /> � <br /> !f CAS Vdume(from Step 2)Is greatrr thon lRV then rro outdoor openings are needed. <br /> if fJ►5 Vdume{from 5 2 7s less thnn 7Ry then a to 51E�5. <br /> Step 5:Cakulate ihe ratip of availabie irrterior volume to ihe Wtal reqrored valume_ <br /> . RaUo=fA5 volume(from SteA 21 a6v�ded by TRV(from Step 4a or Step 4bj <br /> Ratio= <br /> ' Step 6:falculate Reduction FacOor{RF)_ - <br /> Rf=1 mfnus Ratio RF=1- <br /> Stap 7:Cakuiate single outdoor openFng az if ali combustion a"v is from outsfde. <br /> Tota!Btu/hr ioput of all Combustbn Appliances in the same GqS InP� ew/hr <br /> (E%CEPT DtRECf VENT} <br /> Combustkn Air Opening Area(CAOAJ: � <br /> Total BW r dlvfded 3Q0(16tu/hr ;n2 CAOA= /30W Btu/hr per in3= in' <br /> Step 8:Cakulate Mufimum CAOA. <br /> MinimumCAOA=�Ap,qmu/p lfed RF MinimumCAOA- x - in' <br /> Soep 9:Gakulate Combusqon Air Opening Diameter{CAODJ <br /> GQO=1.13 multiplied by tbe sqaore root of Minlmum CAOA CAOD=1.13 v MMimum CAOA= in,dlameter <br /> tqr ar�e inch in size If flex duct <br /> 1 If desired,ACH can be detemuned using ASHRAE cai�ul�on or biower doortest.follow procedures in Sectlon <br /> G�4. <br /> Page 5 of 6 � <br /> �I <br /> � <br />