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Makeup Air Opening Table for New and Existing Dwelling <br /> Table 501.3.2 <br /> One or multiple power One or multiple(an- One atmospherically Multiple atmospherically <br /> vent,direct venl ap- assisted appliances and vented gas or oil ap- vented gas or oil ap- Du�t di- <br /> pliances,or no combus- power vent or direct pliance or one solid tuel piiances or solid fuel ameter <br /> tion appliances ven[appliances appliance appliances <br /> Column A Column B Column C Column D <br /> Passiveopening 1-36 1-22 1-15 1-9 3 <br /> Passive opening 37-66 23-41 16-28 10-17 4 <br /> Passive opening 67-]09 42-66 29-46 18-28 5 <br /> Passive opening 110-163 67-100 47-69 29-42 6 <br /> Passive opening 164-232 101-143 70-99 43-61 7 <br /> Passive opening 233-317 144-195 100-135 62-63 8 <br /> Passive opening 318-419 7.96-258 136-179 84-110 9 <br /> w/motorized damper <br /> Passiveopening 420-539 259-332 180-230 111-142 10 <br /> w/motorized damper <br /> Passive opening 540-679 333-419 231-290 143-179 11 <br /> w/motorized damper <br /> Powered makeup air >679 >419 >290 >179 NA <br /> IJotes: <br /> A. An equivalent length of 100(eet of round smooCh metal duct is assumed. Subtract 40 feet for the exterior hood and ten feet for each 90-degree elbow to <br /> determine the remaining length o(straigh[duct allowable <br /> B If flexible duc[i;used,increase the duct diameter by one inch. Flexible duct shall be stretched with minimal sags. Compressed duct shall no[be accepted. <br /> C. Earometric dampers are prohibited in pass�ve ma4:eup a�r openings when any a[mospherically ven[ed applian�e is instailed. <br /> D. Powered makeup air shall be electrically interlocked with the largest exhaust system. <br /> Sections F <br /> Combustion air <br /> Not required per mechanical code(No atmospheric or puwer vented appliances) <br /> Passive(see IFGC Appendix E,Worksheet E-1) Size andtype � � <br /> Other,describe: <br /> Explanation-If no atmospheric or power vented appfiances are installed,check the appropriate box, not required, If o power vented <br /> or otmosphericaily vented appliance installed, use IFGCAppendix E, Worksheet E-1 (see belowJ. Pleose entersize and type. Combus- <br /> tion air vent supplies must communicate with the appliance or appliances that require the combustion air. <br /> Section F calculations follow on the next 2 pages. <br /> Page4of6 <br />