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Table 501.4.2 <br /> Makeup AIr Opening Sizing Table for New and Exlsting Dwelling Units <br /> One or mukiple power One or multiple fan- One atmospheriwlly vented Multiple atmosphericaliy Duct dt- <br /> vent,direct vent ap- assisted apptiances and gas or oil ap- vented gas or oil ap- ameter <br /> pliances,or no combus- power vent or direct vent pliance or one solid fuel pliances or solid fuel <br /> tion appl{ances appliances Column 8 appliance appliances <br /> Passive opening 1—36 1—22 1-15 1—9 3 <br /> Pauive opening 37—6f 23—41 16—28 SO—17 4 <br /> Passive opening 67—109 42—66 29—46 18—28 5 <br /> Passive opening 110-163 67—300 47—69 29—42 6 <br /> Passiveo enin 164-232 101-143 70-99 4 -61 7 <br /> Passive o nirt 233—317 144—195 1 -1 5 62—83 g <br /> Passiveopening 318-419 196-258 136-179 84-110 9 <br /> d m <br /> Passive openfng 420—539 259—332 180—230 111-142 10 <br /> w motorized dam er <br /> Passive opening 540—679 333—419 231—290 143—179 SS <br /> w/motorized damper <br /> Powered makeup air >679 >419 >290 >179 NA <br /> Notes: <br /> A.An equivalent length of S00 feet of round smooth metal ducc is assumed.Subuact 40 feet for the exterior hood and ten feet for each 90-degree elbaw to <br /> determine the remaining length of strelght duct allowable. <br /> B.If flexible duct is used,innease the duct diameter by one 1nch.Flexible duct shall be stretched with minimal sags.Compreued duct shall not be accepted. <br /> C.Barometric dampers are prohlbited in passive makeup afr openings when any aUnosphericaliy vented appliance is installed. <br /> 0.Powered makeup air shall be electrically interlocked with the largest exhaust system. <br /> Combustion air <br /> Not required per mechanical code(No atmospheNc or power vented appliances) <br /> � Passive(sae IF6C Appendix E,Worksheet E-1) Sfze and type 4 inch rid ed 5 inch flex <br /> Other,describe: <br /> Explanation-If no atmospheric or power vented appliances are installed,chedc the approprfate box,not required.If a power vented <br /> or atmospherically vented appitance installed,use IFGC Appendix E,Worksheet E-1(see betow).Piease enter sise and type.Combustion <br /> ait 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 />