Laserfiche WebLink
. <br /> , � , <br /> Table 501.4.2 <br /> Makeup Air Opening Sizing Table for New and Existing Dwelling Units <br /> One or mukiple power One or mukiple fan- One atmospherically vented Mukiple atmospherically Dua 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 wlid fuel pliances or solid fuei <br /> tion appUances apptlances Column B appliance applfances <br /> Passfveopening 1-36 1-22 1-15 1-9 3 <br /> Passiveopening 37-66 23-41 16-28 10-17 q <br /> Passive opening 67—109 42—66 29—46 18—28 5 <br /> Passive apening 110-163 67—100 47—69 29—42 6 <br /> Passiveo enin 164-232 301-143 70-99 43-61 7 <br /> PassNeo enln 233-317 144-195 100-135 62-83 g <br /> Pass'rveopening 318-419 196-258 136-179 84-130 9 <br /> w mo or zed dam er <br /> Passive opening 420—539 259—332 180—230 111-142 10 <br /> w motorized dam er <br /> Passiveopening 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.Subtrect 40 feet for the extertor hood and ten feet for each 90-degree elbow to <br /> determine the remaining length of straight dud albwable. <br /> B.If flexible duct is used,increase the duct diameter by one inch.Flezible duct shall be stretched wfth minimal sags.[ompressed duct shall not be accepted. <br /> C.Barometric dampers are prohibited in passive makeup air openings when any atmospherically vented appliance is installed. <br /> D.Powered makeup afr shall be electNcally interlocked wkh the largest exhaust system. <br /> Combustion air <br /> Not required per mechanical code(No atmosphedc or power veoted applfances) <br /> � Passive(see IFGC Appendbc E,Worksheet E-1) Size and type 4"RI Id,5"FIeX <br /> Other,describe: <br /> Explanatfon-ff no atmospheNc or power vented appliances are insWlled,check the approprlate box,not required.If a power vented <br /> or atmospherically vented appliance insWlled,use IFGC Appendix E,Worksheet E-1(see below).Please enter size and type.Combustbn <br /> air vent supplies must wmmunicate with the appliance or appliances that require the combustion air. <br /> Section F calculations follow on the next 2 pages. <br />