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C>�� ��,�'v'�/e�f',rre��/ <br /> 7`l.�,C��c�'�e=��';-� !�Y i�� f�i-r.a�L; <br /> . • . THE 2007 MINIESOTA STATE BUILDING CODE <br /> � .� - � � <br /> �• . � � �� <br /> • :� � � �. <br /> Step 1: Complefe vented comb��stion appliance information. <br /> FurnaceiBoilec '�U��>oCi <br /> _Draft Hood Y' Fan Assisted __Direct Vent Input: Btulhr <br /> (Not fan assisted} 8�Power Vent <br /> Water Heater: v .-��lJ�G'ciC.% <br /> _Draft Hood _Fan Assisted n—Direct Vent Input: Btu/hr <br /> (Not fan assisled) 8�Power Vent <br /> Step 2: Calc��laie the volume of 1re Combus?ion Appliance Spar,e(CASj containing combustion appliances_ <br /> The CAS includes all saaces connected to one anothsr by code compiiant openings CAS volum�-�� ft� I <br /> Step 3: Delermine Air Changes per Hour(ACH)� <br /> Defauit ACH vaiues have been incorporated into Table E-1 for use with Method 4b(KAIR Method). <br /> If the year of construction or ACN is r,ot known,use method 4a(Star,dard Method}. <br /> Step 4: Determine Required Volume for C�mbusiion Air. <br /> da. Standard Melhod �'�,�-;��, <br /> Total Btu/hr input of all combus;ion appliances(DO NOT COUNT DIRECT VENT APPLIANCES) Input Btumr <br /> Use Standard Melhod column in Table E-1 to find Total Required Volume(TRV) 7RV:Z��'`'ft3 <br /> If CAS Volume(from Step 2)is greater than TRV then no outdoor openings are reeded. <br /> If CAS Volume�rrom Sfep 2j is less than TRV khen ae to STEP 5. <br /> 4b. Knevrr Air Inf�ifratlon Rate;KAIRj F�lethod <br /> Total Btuinr�nput of a{I ian-assis�ed and power vent appiiances <br /> �DO NOT COUNT DIRECT VENT APPLIANCES) input: Btw'hr � <br /> Use Fan-Assisted Appliances column in Table E-1 to find <br /> Required Volume Fan Assisted(RVFA) RVFA: ft� <br /> Total Butihr input cf aU non-fan-assisted appliances Input: _Btufir <br /> Use Non-Fan-Assisted Applianczs column in Table E-1 to find <br /> Required Volume Non-Fan-Assisted(RVNFA) RVNFA: ft� <br /> Total Required Vclume(TRV)=RVFA+RVNFA TRV= + – � <br /> li CAS Volume(irom Step 2'}is greater than 7RV then no cuttloor cpenings are needed. <br /> if CAS Volume ifrom Step 2)is less than TRV then go to STEP 5. <br /> Step 5: Caiculate lhe.rat;::;`:�.:�lable interior volume!o the tolaf required voluma. <br /> Z�`�1�' L�' ��i 5� . <br /> Ratio=CA.S Volume(from Step 2};+���a�d by TRV(from S�ep 4a or Step 4b} Ratio= _____I_____ <br /> Step 6: Calcuiate R2ducticn Fac:or(RF}. I <br /> RF= 1 minus Ratio RF= 1- •'`�y4' = .� �''�`r <br /> Step 7: Calculate single outdoor openirg as if ali combustion air is from outside. <br /> y�i <br /> Tc(al Btuihr inpu�c�aIl Ccmbuslion Appliances in lr�e same CAS(EXCEPT GIRECT VENT} Inpui: �"��' Btulhr I <br /> Combustion.4ir Ocening Area(CA0.4j: �c"-'� ly�'�'•' <br /> Tctal Btwt•�r divided by 30Q0 Btu�hr oer in' CAOa=�_?30G0 Blur'hr per in2=�in2 <br /> Step 8: Ca'ia.i�ate h.lin;murn CAO'�. (�',��. c`+`{ ✓.� 33 i <br /> ��iirnn��.u;n CAOA=CAOA multipiied by RF i;i�nirnum CAOA= x_= in' � <br /> Step 9: Ga!�u:ate G:mpusticr;,;r�pening Diamefer(CAGDj �, �� ���� i <br /> C'r,00= '.';>multiplied by the square root of titirimum CAOA CAuD= 1.13 x,��iinimum CAOA= __in � <br /> ' if cfes;re�..HCN r,�n;,e deter�,i^�d using ASHRAE calcu!ation or blcv�er door lest Fol!o�v precedures in Section 304, <br /> 382 <br />