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1346.6012 IFGC APPENDIX E, WORKSHEET E-1. pYaknme)aYk Oc‘iiiipi{3v-01041.0,w
IFGC Appendix E,WorksheetE-1
Residential Combustion Air Calculation Method
(for Furnace,Boiler,and/or Water Heater in the Same Space)
Step 1: Complete vented combution appliace information:
Fu ace/Boiler: i as,0 vC)
Draft Hood _Fan Assisted _Direct Vent Input: Btu/hr
(Not fan Assisted) &Power Vent
Water Heater:
_Draft Hood _Fan Assisted Direct Vent Input: Btu/hr
( Not fan Assisted) &Power Vent
Step 2 Calculate the volume of the Combustion Appliance Space(CAS)containing combustion appliances. /
The CAS includes all spaces connected to one another by code compliant openings. CAS volume: ft3
Step a Determine air Changes per Hour(ACH)I
Default ACH values have been incorporated into Table E-1 for use with Method 4b(KAIR Method).If the year of construction
or ACH is not known,use method 4a(Standard Method).
Step 4 Determine Required Volume for Combustion Air.
4a. Standard Method 1 a v °
Total Btu/hr input of all combustion appliances(DO NOT COUNT DIRECT VENT APPLIANCES)Input: Btu/hr
Use Standard Method column in Table E-1 to find Total Required Volume(TRV) TRV: ft3 6 25°
If CAS Volume(from Step 2)is greater than TRV then no outdoor openings are needed.
If CAS Volume(from Step 2)is less than TRV then go to STEP 5.
4b. Known Air Infiltration Rate(KAIR)Method
Total Bluthr input of all fan-assisted and power vent appliances
(DO NOT COUNT DIRECT VENT APPLIANCES) Input: Btu/hr
Use Fan-Assisted Appliances column in Table E-1 to find
Required Volume Fan Assisted(RVFA) RVFA: ft3
Total Btu/hr input of all non-fan-assisted appliances Input: Btu/hr
Use Non-Fan-Assisted Appliances column in Table E-1 to find
Required Volume Non-Fan-Assisted(RVNFA) RVNFA: ft3
Total Required Volume(TRV)=RVFA+RVNFA TRV= + = ft3
If CAS Volume(from Step 2)is greater than TRV then no outdoor openings are needed.
If CAS Volume(from Step 2)is less than TRV then go to STEP 5.
Step'x Calculate the ratio of available interior volume to the total required volume.
Ratio=CAS Volume(from Step 2)divided byTRV(from Step 4a or Step 4b) Ratio= 1 =
Step Er Calculate Reduction Factor(RF).
RF=1 minus Ratio RF=1 -
Step 7: Calculate single outdoor opening as if all combustion air is from outside.
Total Btu/hr input of all Combustion Appliances in the same CAS(EXCEPT DIRECT VENT) Input: Btulhr
Combustion Air Opening Area(CAOA):
Total Btu/hr divided by 3000 Btu/hr per in CAOA= /3000 Btu/hr per in2= in2
Step a Calculate Mihimum CAOA.
Minimum CAOA=CAOA multiplied byRF Minimum CAOA= x = in2
Step Calculate Combustion Air Opening Diameter(CAOD)
CAOD=1.13 multiplied by the square motofMinimum CAOA CAOD=1.13 x vMinimum CAOA= in
1lf desired,ACH can be determined using ASHRAE calculation or blower door test.Follow procedures in Section 304.
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