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1 <br /> • <br /> IFGC Appendix E,Worksheet E-1 <br /> Residential Combustion Air Calculation M(fur Furnace,Roller,aethod <br /> Slop 1:Contploto vented combustion appliance informationnd/or Water Heater to the same space) <br /> Furnace/Boller: <br /> .-____..Draft Hood <br /> (Not fan assisted) -Pari Assisted <br /> &power Vent Direct Vent <br /> Water Heater: Input: <br /> (Not <br /> Hood (�O�r Q Utu/hr <br /> (Not fan assisted) Fart Assisted <br /> &Power Vent <br /> ______,Direct Vent: <br /> Step 2:Calculate the volume of the Combustion Appliance Space � --' Input: <br /> The CAS Includes all spaces connected to one another' p SV 0�—�-etu/ht <br /> (CAS)containing combustion app►lances. <br /> by code compliant openings. <br /> Step 3:Determine Air Changes per Hours(ACIi)t CAS volume/(� j <br /> Default ACI I values have been incorporated Into Table E.• <br /> for use with year of construction or ACH is not know,use method 4a(Standard Meth Mehb <br /> Step 4:Determine Required Volume for Combustion Air. Gill Method).If the <br /> 4a.Standard Method <br /> Total Utu/hr input of all combustion appliances <br /> (Do NOT COUNT DIRECT'VENT APPLIANCES) <br /> Use Standard Method column in Table F-.t to find Total Required Volume(11W) Irrpu(:_=_tiro/hr <br /> II CA5 Volume(from Step 2)Is greater than i HV then no outdoor o <br /> 171V; 1 <br /> if CAS Volume(from Step 2)is less than'r1iV then : , peninps are needed. <br /> _fl3 <br /> 4b. Known Air infiltration Rate(i(AIR Method l'O to ,7k1�,. <br /> Total Utu/hr input of all fan-assIsted and power <br /> (DO NOT COUNT DIRECT VENT I u vent appliances <br /> CNT-APt t.ifINCES) <br /> Use ran-Assisted Appliances column in'I able E-1 to fine! <br /> Required Volume Fan Assisted(RVFA) input: q.:49 <br /> ll <br /> Total Uttt/hr input of all noti-fart-assistett appliances <br /> Use Nun-Fan-Assisted Appliances column In Table F.-: 1{VEA: <br /> liegtrtreci Volume 2_ lt� <br /> Non-Fan-Assisted(IlVNrA) t to find Input: <br /> It1t<r!Required Volume(TiiV = —�- -ittr/hr <br /> If CAS Volume{from Step 2)) RVFA a•RVNFA <br /> it/NM: <br /> I Is greater than-OW then no outdoor openings RV.:-.??50,. t��(t� <br /> if CAS Volume(from Step Z)Is less than TRV then <br /> Step 5:Caiculate the ratio ofavallabic Into are Weeder). 14,4„.• ���.1'ts <br /> r,t,to sreh <br /> Ratio= cava volume to the total required volume. <br /> CAS Volume(from Step 2)divided 1TtV b (from Step <br /> Step r:Calculate Reduction Factor Yqa or Step 4b) <br /> RI'-:1.minus natio (RV)). Ratio_` � <br /> Stem 7:Calculate single outdoor openin <br /> e. <br /> focal r, is if ell combustion girls from <br /> tlttr/hr input of all lif J ..�_c <br /> Combustion Appliances tri the sante CA5 FXcI TDI �. �-L� <br /> combustion Air Opening Area(CAOA : <br /> Tota!Ottr/hr dtvrded b 3 ) ( C f DIRECT VENT) <br /> Ste r ti; Y U40 Uhr/!rr per inr. input <br /> Calculate Minimum v�y�Utu/hr <br /> CnCJA. coon- 0 <br /> Mil ammo(AOA`CAOA rnultlptied b 00 3000 Btu/hr ho.� <br /> Step g;Calculate Cur Y in; <br /> tnz <br /> nbustion Air Opening;Diameter f <br /> MinHnurrt CAO ... <br /> l=f1UU`.Lia ntu(tiplled by (•AOD) __fio__6_a <br /> the square root of 3. ' 1y-�f�._inz <br /> ►f desired,qC}I can be ,led determt ed using Minimum CAVA ` <br /> !;ASHRAE calculation or blower CAOD <br /> door test, z.1a Minimum CAOA <br /> jFoOow procedures in Section GJ04. —"'"—�in <br />