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� <br /> � �M r� <br /> .� <br /> . ' . ' <br /> 1346.6012 IFGC APPENDIX E, �VORK5HEE1 E-1. <br /> ' IFGC Appendix E,WorksheetE-1 <br /> Residential Combustion Air Calculation Method <br /> for Fumace,Boiler,and/or Water Heater in the Same S ace <br /> Step 1: Complete vented combution appliace information: <br /> Fumace/Boiler. ppp <br /> Draft Hood Fan Assisted Direct Vent Input: ���Btulhr <br /> (Not fan Assisted) &Power ent <br /> Water Heater: �,c�ooC <br /> _Draft Hood �Fan Assisted Direct Vent Input: -r�� Btulhr <br /> Not fan Assisted �Power Vent <br /> SLep 2 Calculate the volume of the Combustion Appliance Space(CAS)containing combustion appliances. a <br /> The CAS includes all s aces connected to one another b code com liant o eni s. CAS vofume: <br /> S6ep 3 Determine air Changes per Hour(ACH}f <br /> Default ACH values have been incorporated into Table E-1 for use with Method 4b(KAIR Method).If the year of construction <br /> or ACH is not known,use method 4a Standard Method. <br /> S�ep 4 Determine Required Volume for Combus6on Air. <br /> 4a Standard Method ��-�� <br /> Total Btulhr input of all combustion appliances(DO NOT COUNT OIRECT VENT APPLIANCES)Input: Btu/hr <br /> Use Standard Method column in Table E-1 to find Total Required Volume(TRV) TRV: at�ft3 <br /> If CAS Volume(from Step 2}is gn�a�r d�an TRV then no outdoor openings are needed. <br /> If CAS Volume(from Step 2}is/ess U�anTRV then go to STE P 5, <br /> 4b. Known Air Infiltration Rate(KAIR)Method <br /> Total Btulhr input of all fan-assisted and power vent appliances <br /> (DO NOT COUNT DIRECT VENT APPLIANCES) Input; Btumr <br /> Use Fan-Assisted Appliances column in Table E-1 to find <br /> Required Volume Fan Assisted(RVFA) RVFA: ft3 <br /> Total Btu/hr input of all non-fan-assisted appliances Input: Btumr <br /> Use Non-Fan-Assisted Appliances column in Table E-1 to 6nd <br /> Required Volume Non-Fan-Assisted(RVNFA) RVNFA: fts <br /> Total Required Volume(TRV)=RVFA+RVNFA TRV= + - ft3 <br /> If CAS Volume(from Step 2)is gn�a�rdlan TRV then no outdoor openings are needed. <br /> If CAS Volume hom Ste 2 is less tl�an TRV then o to STE P 5 <br /> SLep 5� Calculate the ratio of available interior volume to the total required volume. a�� <br /> Ratio=CAS Volume from Ste 2 divid�d b TRV from Ste 4a or Ste 4b Ratio= I - • <br /> SOep& Calculate Reduction Factor(RF). <br /> RF=1 mi►xis Ratio RF=1 - ��- •�a <br /> S oep 7: Calculate single outdoor opening as if all combustion air is from outside. � <br /> Total Btu/hr input of all Combustion Appliances in the same CAS(EXCEPT DIRECT VENT) Input: � Btu/hr <br /> Combustion Air Opening Area(CAOA): �p <br /> Total Btu/hr divlded b 3000 Btulhr er inz CAOA=�'' 13000 Btumr er inz= o7�n2 <br /> SOep 8 Calculate Minimum CAOA. <br /> Minimum CAOA=CAOA md6 ied b RF Minimum CAOA= d�x •�� _ •�in2 <br /> Sflep 8 Calculate Combustion Air Opening Diameter(CAOD) , •�� $ <br /> CAOD=1.13 mrdti iedb �hes rootofMinimum CAOA CAOD=1.13 x Minimum CAOA= in <br /> 'If desired,ACH can be determined using ASHRAE calculation a blower door test.Follow procedures in Section 304. <br /> 58 <br />