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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 oii 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 /> Passiveopening 37-66 23-41 16-28 10-17 4 <br /> Passiveopening 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 318—419 196—258 136—179 84—110 9 <br /> w/motorized damper <br /> Passive opening 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 /> 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 iargest exhaust system. <br /> Section F <br /> Combustion <br /> � Not required per mechanical code(No atmospheric or power vented appliances) <br /> Q Passive(see IFGC Appendix E,Worksheet E-1) Size and type 6"INSULATED FLEX <br /> � 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-1 (see below). P/ease <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 /> 4 <br />