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Table 501.4.2 <br /> Makeup Air Opening Sizing Table for New and Facisting DwelNng Unfts <br /> One or muitiple power One or mulUple fan- One atmospherically vented Multiple atmospheriplly Duct di- <br /> vent,direct vent ap- assisted appliances and gas or oil ap- vented gaz or ofl ap- ameter <br /> pliances,or no combus- power vent or direct vent pNance or one solid fuel pliances or solid fuel <br /> Uon appllances appUances Column B appliance appliances <br /> Passiveopening 1-36 1-22 1-15 1-9 3 <br /> Passive opening 37—66 23—41 16—28 10—17 4 <br /> Passiveopenfng 67-109 42-66 29-46 18-28 5 <br /> Passive opening 110-163 67—100 47—69 29—42 6 <br /> Passiveo enfn 164-232 101-143 70-99 43-61 7 <br /> Passive o enin 233—317 144—195 100—135 62—83 8 <br /> Passive opening 318—419 196—258 136—179 84—110 9 <br /> w r <br /> Passiveopening 420-539 259-332 180-230 311-142 SO <br /> w matorfzed dam er <br /> Passive opening 540—679 333—419 231—290 143—179 11 <br /> w/motorized damper <br /> Powered makeup air >679 >419 >290 >i79 NA <br /> Notes: <br /> A.M equivalent length of 300 feet of round smooth metal duct is assumed.Subuact 40 feet for the exterior hood and ten feet fa each 90-degree elbow to <br /> determine the remaining length of straight duct allowable. <br /> 8.If flexible duct is used,increase�e duct diameter by one inch.Flexible duct shall be stretched wtth minimal sags.Compressed duct shall not be attepted. <br /> C.Barometric dampers are prohfbited in passive makeup air openings when a�y atmospherically vented appliance is fnstalled. <br /> D.Powered makeup alr shall be electriwlly interlocked with the largest exhaust system. <br /> Combustion air <br /> Not required per mechanipl code(No atrnospheric or power vented appliances) <br /> � Passive(see IFGC ApDendix E,Waksheet E-1) Size a�d type 3°RI ICl 4'�FI@X <br /> Other,describe: <br /> Explanatlon-If no atmospheric or power vented applfances are installed,chedc the appropriate box,not required.If a power vented <br /> or atmospherically vented appliance installed,use IFGC Appendix E,Worksheet E-1(see below).Vleaze enter size and type.Combustion <br /> air vent supplies must communtcate with the appliance or appliances that require tfie combustion air. <br /> Section F calculations follow on the next 2 pages. <br />