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Directions-The Minnesoio Fue!Gos Code rr�ethod to catculate to size of a required combccstion oir openin�is called the Known Air <br /> lnfrhrarion Rate Method. For new tonstruction,4b of step 4 ts requlred to be fllled out. <br /> IFGC Appendix E,Woriaheet Ei <br /> Residentiat Cambusdon Air Calculation Method <br /> for Furnace,Bolkr,�d/or Water Heater in the Same 5 <br /> . SteQ 1 Complete vented cortiMestlon applWn �nformation. <br /> Fumace/Boiler: <br /> Draft Hood Fan Assisted rect Vent Input: Btu/hr <br /> �x <br /> w Pow�VeM — r � ��'�� <br /> WaterHeater: � '� ' <br /> Drafk Nood Fan Assi�ed _Direct V�� lnpuh. Btti/h► <br /> orPowerYent <br /> Step Z Calcvlate the volume of the Combustion Appliance SPace(CA5)oont�M�wmbustSon apptlanaes. <br /> The CJIS 9ndudes atl s�ces comected to one another by wde mmpliam openi�gs. CAS volume: ft' <br /> LxWxH L W H <br /> Step 3:Determine AlrChanga per Haur(ACH)1 <br /> oefault AQi values have lxen iruorporated into 7able E-i tor use with Method 46(KAIR Meihaan. <br /> If the ar of constnutbn�ACHis not known,use mettrod 4a St�datd Me <br /> Step 4:Determine Required Volume forCombustian Air.(�NOT COUNT DIRECT NEtdTAPPUANCES) <br /> 4a.Standard Method <br /> Total Btu/hr input of all combintion applianees Irtput Bto/hr <br /> Use Standard Nethod column in Tabk E-1 to flnd Total Required TRV: ft' . <br /> vdume(TRv) � <br /> If Ul5 Yolume(from Step 2�Ts groater fhan TRV then no outdaor openings are needed. <br /> IE CAS volume�(from St�2)Is Ias thon TRv then go to STEP 5. <br /> 4b.Known Aic!Infikratta�Rate IKAIR�Method(DO NOT COUNT DIRECT VENTAPPLWIVCES) <br /> Tata)fltu/hr T�nput of all fanasskted and power vent appiiances Input: 8tu/hr <br /> Use Fao-Assisked Appifances column in Table E-1 to flnd RVFA: ft' <br /> Required Voi4me Fan Auisted(RVfA) � <br /> Totai Btu/hr i�put of aU Naturai drait appliaruss V Input Btu/hr <br /> Use NaWra�draft AppAa�ces column in Tabte E-1 to flnd RVWFA ft' <br /> Required Volim�e Natuial draft applknces(RVNOA) <br /> Total Required Volume(TR�=AVFA+RVNDA TRV= + = TRV ft <br /> If CAS Vol�ane lfrom Step 2)!s gnotu than TRV then no outdoor opeNogs are rreeded. <br /> If CAS Volim�e(fran Step 2 is lest ihon TRV then bo STER 5. <br /> Scep 5:Cakulatethe ratfo of avaAa6te interiorvofume tothe totai tequked volume. <br /> Ratio=CAS Vdume{irom Step 2J dhrided by TRV(from Step 4a or Step 4b) <br /> � RaUo= / <br /> Scep 6:Cakulate Reduction factor(RF). <br /> RF=1m7mtsRatio �=1- _ <br /> Siep 7:Ca1W kate single wrtdoor opening as if all combustion air is from outside. <br /> . Totai Btu/h�input of all Combustlon Appltances 1n the same CAS Input• Btu/hr <br /> {IXCEPT DIRECT VENI'} <br /> Combustiop Air Opening Area(CAOA]: <br /> Total Btu/hr d'rvlded b 300U Btu/hr per in2 CAOA= /300�8tu/hr v in�= in' <br /> Step 8:Caltulate Minfmum CAOA. ' <br /> MMimum CAOA=CAOA mu 'lled itf Minimum CAOA= x +� in' <br /> Step 3:Cakulate Com6usdan Nr Opening O�meter(CAOD) <br /> Cqpp=1.13 mulUplfed 6y the squore raoi of Minimum CAOA CAOD=1.13 Y Minimum GOA= in.'�iameter <br /> 0 orK hKh 3n she if usin fl�dud <br /> ]If desireA,A��n he determined tuing AS1iRAE calcvlati�or blower door test.foltaw procedures in Sectian <br /> G304. <br /> ' Page 5 of 6 <br /> . � <br />