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• a required combustion air opening,is called the Known Air <br /> DIMCOons-The Minato Wel Gas Code method to <br /> i red to bee d out <br /> infii rotion Rate Method. For•new constrUM",4b� P <br /> 1FCsC Appends E,Worksfieet E-1,1346.6012 <br /> Residential Combustion All Calculation Method <br /> for Furnace,Boller,and/or Water Heater in t Same oe1 <br /> Step L.Complete vented combustion appliance information• tl0 � Btu/hr <br /> Furnaw/Bovar pirectverrt input _/ <br /> Draft Hood _Fan Assisted <br /> or Power Vent <br /> Water Heater. pirectVent input: <br /> graft Hood Fan Assisted _ <br /> or power Vent u CAS carntairdn6 combustion appliantxs. 4S�S d <br /> Step L•Calculate the valuate of the Combustiot',ppitance SPO- <br /> stop <br /> ) CAS volume: <br /> The CAS includes all spaces connected to one another by Mode COmPpant openings W µ :9016X <br /> LXWXIi <br /> Step 3e Deternmine Air Changes per Hour(ACH)1 4b KAIR Method). <br /> Default ACH values have been incorporated <br /> into Table E-1 for use with method <br /> if the ar of construction or ACH Is not known use 1'1'1 d 4a Standard <br /> Step 4:Determine Required Volume for Combustion Air.(DO NOT COUNT DIRECT VENT APPUAWCFS) <br /> 4a.Standard Method Input fir <br /> Total aw/hr Input of 311 combustion appliances �V W <br /> Use Standard Method column In Table E-1 to find Total Requlrcd <br /> volume(TRV) graaW than TRV then no outdt>a openings are needed. <br /> if CAS Volume(from Step 2)h <br /> if CAS Volume(from Step 21 is Jess than TRV then go to STEP 5. <br /> 4b.Known Air Irnfldation Rate(KAIR)Method 100 NOT COM DIRECT VENT APPLWt�iCES? pgremr <br /> Total Btu/hr input of all fan-assisted and Power RVFA:5656,;)S ft.Use Fan-Assisted Appliances column in Table E-1 to find <br /> Required Volume Fan Assisted(RVFA) Q repot: Btu/hr <br /> Total BtWhr input Of all Natural draft appliances <br /> •`-- <br /> antes column in Table E-1 to find RVNFA <br /> Use Naeyrol draft Appli <br /> Required volume Nature'draft apppances(RVNDA) = 56 a c� TRV ft, <br /> Total Required Volume(TRA=RVFA+RVNDA <br /> TRV= Q sem--+ (z) J <br /> if CAS Volume(from Step 2)is gr_,cer dro+r TRV then no outdoor openings are needed- <br /> if CAS Volume from Stop 2)Is Jess than TRV then to to STEP 5. <br /> Step S.Calculate the ratio of available interiorvoolume 4a or Step red volume. s� <br /> Ratio=CAS Volume(from Step 21 cMded byry (meStep Ratio= J <br /> Step B:Caned e•RedtiCtion factor(RF). t/q <br /> RF=1 minus Ratio7y�(J BtWhr <br /> Step 7:Cakulam singie outdoor open►n8 as if ail combustior�air la from outside Input <br /> Total Btu/hr input of an nces in the same CAS <br /> (EXCEPT DIRECT VWn <br /> CombustSon Air Opening Area(CAOA)-r r=: CAOA- <br /> 7 / /30�atu hr er inl <br /> Totals r d�rasw actio <br /> step Br Cal late Minimum CAOA- <br /> MinimumCAOA-CAAAmuPolpOp g MinimumfAOA= <br /> step 9:Calculate Combustion Alr Opening Demeter <br /> CAOD=113 muNJplfsd by tJre sgrare root of Minimum CAOA CAOD=113 V Minimum CAOA-- <br /> 0 one inch in size if flex duct Follow prouduras in Section G304. <br /> I if desired,ACH can be determined using ASHRAE Clicu"on or blower de»nest <br /> page 5 of 6 <br /> u\"da,,gWfetVPoBdedaformatian\Current\2016\Ve"*ekupr-ombAMf'WM16-WM <br />