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.• , <br /> Directiorts-The Minnesoto Fuel Gas Code method to calcu/oie fa srze of o requlred combustion oir opening,rs tplled the Known Air <br /> lnfiltratr'on Rate Method. For new canstrurtion,46 of siep 41s required to be jilled out. <br /> IFGC Appendu E,Worksheet E-1 <br /> Residentiai Combustipn A�r Ca�cuiatwn Metnod <br /> tfar�urnace,Boiier,ana�or Watzr Heater in the Sar*.e Space; <br /> Scep 1:Compiete vented:omoustion appf�nce info•mation. <br /> Furnace/Boiler: <br /> ...Drah hood _ Fan Assisied Xp�roct vem Input� �4.-'=`•,L�U Btu/hr <br /> or Power Vent <br /> ! Water Meater� <br /> _p2ft NooC �Fan Assssted OIrecL Vpnt Input: ��r�r� g;,;�i�, <br /> � or Power Vent <br /> Step 2:CalCulate the vol�me of the Combustion Appl;ance Spece fG45)containing combus::an app'iantes. � � '�,�� „� ;- ..� <br /> � The CAS ind�des all spaces caonected ro onQ another hy code wmpliant openings. CAS vciume: �4�Z. h' � ,� *., 152 <br /> L x t1!x M � yy H �� ---- <br /> IStep 3 Determme Air Changes per Nour(ACH►1 - <br /> I �efault ACM values have heen mcorporated inta Table E-i for„se w�tn MethoN 4b iKA1R Method;. <br /> If the year of construcuon o•ACt1 is not known use method 4a tStandaM Method) �� <br /> � Step 4:Determme Requ•red Vclume for[omousUon Aif (p0 NOT COUN7 OIREC'VENT APPUANCE5; <br /> I <br /> � 4a.Standard Method � <br /> Totaf Btu/hr:nput of au comt x:�on appi�dnces Input: Btujhr ( <br /> Use Standard Method coi�mn m Table E-1 to find Toxal Reqwrrtl TRV: ft' <br /> vo�ume(TRV) <br /> ff CAS Volume(hom Step 2)is yrrater tlan TRv tMen no outdaor opemngs are needed. <br /> If CAS Votume(from Step 21 B less than TRV then go ro 5'iEP 5. <br /> � 4b.Known Air Inflnaticn Rate�KAIR}Method�DO h0T CDUNT OIRFCT VENT APPiIANCESj <br /> ; Total Btu/hr input of ail fart-aAisteQ and power veM aRPi�ances Input �=L,�� Btu,'hr <br /> i Use Fan•Ass�sted App(iances coiumn in 7abte E�1 to finy RVFA "-�J�U g° � <br /> Requ�red voiume Fan Assisfed'iRL�FA) i <br /> i <br /> i 7otal Btu/hr input of atl Nitursl draft appliances InDut: ' 8:u/nr � <br /> Use Natural tlraft Appliances column m%abie E-1 to find RVNFA. '� h� <br /> Required Volume Naturai draft�ppfiances(RVNDA) <br /> Total Requ�rcd vofume(TRVj=RVFA.RVNpA 7qy: ``�J�'=l� • _ ��..``�~..�i'i i R��; <br /> � If CAS Volu me jfrom Step 2}is preoter tlwn TRY Nen no oatdoor upenings are needec. <br /> i If CAS Volume�f�om Ste 2j is kss tlmn TRv then o to 57EP 5. <br /> ( Step S:Glculate the nLio af available iirterior vo�ume to the wtat requ�red volume. <br /> jRatio=CAS Velume(from Step 2)divided by TRY�from Step 4a or Step 4h) <br /> _ rtacso s 'C�Z � ���.�, , �Z4 <br /> � Step 6:Calculate ReducUon Pactor(RF). <br /> Rf=1 minus Ratio RF-Z. ��Z�1 - •111 <br /> Step 7:[alwlate single outdoor apenmg as if ait combustion air is fram ouu�dc. <br /> Total Btu/hr input of ali Ccmbustion Appiiances in the same CAS inpit� ��U(�U Btuihr � <br /> {EXCEPT OIRECT VENT) <br /> � Combustion Air Opening Area{CAOA): � <br /> Total Btu/hr dlvidtd 6Y 3000 Bt:,/hr per;n= fApA= (;r i 3DD0 Btu/hr ce'in'= L(3 ,}= ' <br /> C Step 8:Calculate Minimum CA04. <br /> � Mmimum CAOA=CA�A mttkfplied by kF M�n�mum CAOA= Z:i x �'!1 �J,� m � <br /> _ -— � '_� <br /> Step 9:Catcuiate Combustion A r Opening Diameter(t,a,ODf " � � <br /> I <br /> CAOD=1.13 mWtipfied by the squoie root pJM7nimum�,qpp, CApC=:.3� M:�imum;AOA= �M �t m C�ameter � <br /> o up one inch in siz!if usi fle:dua <br /> i If desired ACN can be detern+;ned using,4SNRAE wlcu�ation or bbwer door test Poliow procedures m Sedicn �"� <br /> G304 _ I <br /> LC,'` T t L�+l t 5 N�k�+C� <br /> G:�Forms\VentMakupCombA:cCa's041511.dwx 1'age 5 af 6 <br />