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Makeup Air Opening Table for New and Existing Dwelling <br /> Table 501.3.2 <br /> One or multipie power One or multiple fan- One atmospherically Muftiple atmospherically <br /> vent,direct vent ap- assisted appliances and vented gas or oil ap- vented gas or oil ap- Duct di- <br /> piiances,or no combus- power vent or direct pliance or one solid fuel piiances or soiid fuel ameter <br /> tion appliances vent appliances appliance appiiances <br /> Column A Column B Coiumn C Column D <br /> Passiveopening 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—b6 29-46 18-28 5 <br /> Passive opening 110-163 67—100 47—69 29—42 6 <br /> Passiveopening 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 /> 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 /> 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-degree elbow to <br /> 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 not be accepted. <br /> C. earometric 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 /> Sections F <br /> Combustion air <br /> Not required per mechanical code(No atmospheric or power vented appliancesJ <br /> Passive(see IFGC Appendix E,Worksheet E 1) Size and type � e j� ,1f)��c <br /> Other,describe: <br /> Explanation-lf no atmospheric or power vented appliances are installed,check the appropriate box,not required. If a power vented <br /> or atmospherica(ly vented applronce installed,use IFGC Appendix E, Worksheet E-1(see below). Please enter size ond type. Combus- <br /> tion air vent supplies must communicate with the appliance or appliances that require the combustion air. <br /> Section F calcu/ations follow on the next 2 pages. <br /> Page 4 of 6 <br />