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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 fan- One atmospherically Multiple atmospherically <br /> vent,direct vent assisted appliances and vented gas or oil vented gas or oil Duct <br /> appliances,or no power vent or direct appliance or one solid appliances or solid fuel diameter <br /> combustion appliances vent appliances fuel appliance appliances <br /> Column A Column B Column C Column D <br /> Passive opening 1-36 1-22 1-15 1-9 3 <br /> Passive opening 37-66 23-41 16-28 10-17 4 <br /> -Passive opening 67-109 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 62-83 8 <br /> Passive opening <br /> _w/motorized damper 318-419 196-258 136-179 84-110 9 <br /> Passive opening <br /> -w/motorized damper 420-539 259-332 180-230 111-142 10 <br /> Passive opening 540-679 333-419 231-290 <br /> w/motorized damper 143-179 11 <br /> Powered makeup air >679 >419 1 >290 I >179 NA <br /> Notes: <br /> A.An equivalent length of 100 feet of round smooth metal duct is assumed. Subtract 40 feet for the exterior hood and ten feet for each 90- <br /> degree elbow to determine the remaining length of straight duct allowable. <br /> B.If flexible duct is used,increase the duct diameter by one inch. Flexible duct shall be stretched with minimal sags. Compressed duct shall <br /> not be accepted. <br /> C.Barometric dampers are prohibited in passive makeup air openings when any atmospherically vented appliance is installed. <br /> D.Powered makeup air shall be electrically interlocked with the largest exhaust system. <br /> Section F <br /> Combustion <br /> 0 Not required per mechanical code(No atmospheric or power vented appliances) <br /> 0 Passive(see IFGC Appendix E,Worksheet E-1) Size and type 6"flex <br /> Q Other,describe: <br /> Explanation - If no atmospheric or power vented appliances are installed, check the appropriate box, not required. If a <br /> power vented or atmospherically vented appliance installed, use IFGC Appendix E, Worksheet E-9 (see below). Please <br /> enter size and type. Combustion air vent supplies must communicate with the appliance or appliances that require the <br /> combustion air. <br /> Section F calculations follow on the next 2 pages. <br /> l 4 <br /> I I <br />