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. , <br /> Table 501.4.2 <br /> Makeup Air Opening Sizing Table for New and Ex�tPng DwelHng Units <br /> One or multlple power One or multiple fan- One atmospherirally vented Multlple atmospherlplly Duct di- <br /> vent,direct vent ap- assisted appliances and gas or ofl ap- vented gas or oil ap- ameter <br /> pliances,or no combus- power vent or direct vent pliance or one solid fuel pUances or sofid fuel <br /> tfon appliances appliances Column B appHance appliances <br /> Passive opening 1—36 1—22 1-15 1—9 3 <br /> Passiveopening 37-66 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—100 47—69 29—42 6 <br /> Passiveo enln 164-232 1 1-143 70-99 43-61 7 <br /> Passive nin 233—317 144—195 300—135 62—83 8 <br /> Pauiveopening 318-419 196-258 136-179 84-110 9 <br /> 1 <br /> Pauive opening 420—539 259—332 180—230 311-142 10 <br /> w motwized dam er <br /> Passiveopening 540-679 333—di9 231-290 143-179 Si <br /> w/motorized damper <br /> Powered makeup air >679 >419 >290 >i79 NA <br /> Notes: <br /> A.An equfvalent length of 100 feet of round smooth metal dud fs assumed.Subtract 40 feet for the exterior hood and ten feet for each 90-degree elbow to <br /> determf�e the remaining length of stretght duct allowabte. <br /> e.If flexible duct Is used,inttease the duct diameter by one inch.Flexible duct shall be stretched with minimal sags.Compreued duct shall not be aaepted. <br /> C.Barometric dampers are prohfbited in passive makeup air openings when arry atrnosphericaUy vented appliance fs installed. <br /> D.Powered makeup air shall be eleCVicalty interlocked with the largest exhaust system. <br /> Combustion air <br /> Not requfred per mechanipl code(No atrnaspheric or power vented app�lances) <br /> � Passfve(see IPGC Appendix E,Worksheet E-1) Size and type 4"rid @d 5"fl@X <br /> Other,describe: <br /> Explanation-If no atmospheric or power vented applfances are installed,check the appropriate box,not required.If a power vented <br /> or atmosphericaily vented appiiance installed,use IFGC Appendix E,Worksheet E-1�see below).Please enter size and type.Combustion <br /> afr vent wpplies must commu�icate with the appliance w appliances that requfre the combustiai alr. <br /> Section F calculations follow on the next 2 pages. <br />