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Ct�er�r�f .� <br /> . . <br /> ;Sk�."t;, Gomp�ete vented combushon appliance informal�on. <br /> Fumace�Baffer, �/ <br /> _Dr�ft liood ,.,..,Fan Assisted 1`�Dire�t vent Input;I�(�N�'�tuthr <br /> (Not fan asslstedJ &Power Vent <br /> water Heater, <br /> �1��� <br /> _Draft Hood �an Assisted _Direct Vent Input:�"�tul�r <br /> (Not fa�assisted) &Power VeM <br /> ;���; Cafculete fhe voiurt►e oi t�ie Combustfon Appliance Space(CAS}cont�(ning combustion applienCos. ��� <br /> The CAS includes all spaces con�ected to one�notlter qy code compliant openings. CAS volume:�_____tri� <br /> ��:�� Qeterrmne Air Changes per Hour(ACH}� <br /> Default ACM values have been Incorporated into Table E-1 for use wiih Meihad�b(KAIR Method). <br /> It the year ot canatruct�on or ACH is npi known,use method 4a(Standard Method). <br /> '�iYxis Oeterm;ne Required Volume fpr Cpmbustion Alr, <br /> 4a. Standard Methad <br /> ?atal�tulhr mput oi alf combustion appliances(DO NaT COUNT RIFt�GT V�NT APPLIANC�S) fnput:�,_,BtuNx <br /> ltse 3t�ndard Meihod cdumn in Table E-1 ro find Totai Required Volume(TRv} 7RV: t� <br /> If GQS Volume(from Step 2)is graatar than TRV ihen no outdoor openings are needed. <br /> If CAS Valume(from Step 2)is less than TRV then go to STF�5. <br /> �ib. Knov,m Air lnfiltration Rate(KAIR}Method ����d0 <br /> Total Btulhr input of all fan-assisEed and power vent appliances <br /> (D�NOT COUNT DiRECT VENT APPIIANC�S) Input Biulhr <br /> Use Fan-Assisted Appliances cak�mn in Tabfe�-1 ta find �fJ <br /> REqufred Volume Fan ASSfSted(RVFA) RVFA:�R3 <br /> 1'Mal 8utmr input of aU non-fan-assisted appliances Input: � Btufir <br /> Use Non-Fan-Assis6ed Appli�noes column in T�ble�-1 tp�ind <br /> Required Volume Non-Fan-Assisted{RVNFA) RVNFA: � it3 <br /> Total Required Volume(TRV)=aVFA+I�VN�A TR.V=So��� + d W.��Sa F13 <br /> it CAS volume(irom Step 2)is greater than"i'RV then no outdoor openings are needed. <br /> H CAS Volume ffrom Step 2)is less than TRV then go to STEP 5. <br /> `�;?�:; Calcufate the raUo of available tnte�ior volume to the tafal requh�ed valume. <br /> Ftatio=CA5 VolUme(frpm Step 2}divld�d by TRV(trom Step 4a or Step 4b) Ra1io= ! <br /> ���,8;�:� Calculate Fteductfon Factar(FtF). <br /> RF=�miaus Ratio RF=1- <br /> :.�'�' Calculale stngle outdoor opening as If atl combustian air is from autstde. � <br /> 'f�tal 8tufir Input ot ali Cambustfon Appllances In the same CAS(EXCEP7 DIRECT VEN17 fnput 9tulh� <br /> Combustion Air Opening Area{CAOAj: <br /> Total stulhr divided by 3000 8lulhr per in2 CAOA=�!3QOtl 8tulhr per in�=�inz <br /> ii��'�,�'�; Calc��ate Minimum CAOa. <br /> Mkaimum CAQA=CAQA muldpli�Cl by RF Minfmum CAOA=,�x,,,�= Inx <br /> ;��►';�t; Calculate Combuslian.4ir Opening Diamet�r(CAOq) <br /> CAOD=1.13 mulNpfied by the square root of M�imum CAPA CAQD�1.13 x Minimum CA0�4� l�in <br /> �If desired,ACN can be determined usEng ASHRAE ca�ulallon or blower door fe�L Foqow prpcedures in Sectit►n 3Q4. <br /> 1346-64 <br />