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Table 501.4.2 <br /> Makeup Air Openin Sistng Table for New and Existing Dwelli Units <br /> One or multlple power One or muldple fan- One atmospheriwlly vented Muldple atmospherially Ouct dl- <br /> vent,direcc vent ap- assisted appUances and gas or oll ap- vented gas or otl ap- ameter <br /> plfances,or no combus- power vent or direct vent pliance or one solid fuel pliances or solid fuel <br /> tlon applfances applfances Cotumn B appliance appliances <br /> Passive openfng 1—36 1—22 1-15 1—9 3 <br /> Passiveopening 37-66 23-41 16-28 10-17 4 <br /> Passfve opening 67—109 42—66 29—46 18—28 5 <br /> Passive opening 110-163 67—S00 47—69 29—42 6 <br /> Passive enin 164—232 101-143 70—99 4 —61 7 <br /> P ssive o nin 233—317 144—195 100-1 5 62—83 B <br /> Passiveopening 318-419 196-258 136-179 84-110 9 <br /> Passive opening 420—539 259—332 180—230 111-142 SO <br /> w motorized dam er <br /> Pauive opening 540—679 333—419 231—290 143—179 11 <br /> w/motorized damper <br /> Powered makeup air >b79 >419 >290 >379 NA <br /> Notes: <br /> A.M equivalent length of i�feet of round smootl�metal duct is assumed.Subuact 40 feet for the exterlor hood and ten feet for each 90-degree elbow to <br /> dete►mine the remaining iength of stralght duct allowable. <br /> B.If flexible duct is used,increase the duct dlameter by one inch.flexible duct shall be stretched with minimal tags.Compreued dud shall not be accepted. <br /> C.Barometrk dampers are prohibited in passive makeup air openings when arry atmospherfcally vented appllance is installed. <br /> D.Powered makeup air shall be electrically interlocked with the largest exhaust system. <br /> Combustion air <br /> Not requfred per mechanipl code(No atmospheMc or power vented appliances) <br /> � Passive(see IFGC Appendix E,Worksheet E-1) Size and type "ryd Bd 5"fl@X <br /> Other,desvibe: <br /> Explanatlon-If no atrnospheric or power vented appUances are installed,Chedc the appropriate box,not requfred.If a power vented <br /> or atrnospherfcally vented appliance installed,use IFGC Appe�dix E,Worksheet E-i(ue bebw).Please enter slze and type.Combustion <br /> air vent supplies must canmunicate with the appliance or appliances that require the combustion air. <br /> Section F calculations follow on the next 2 pages. <br />