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Table 501.4.2 <br /> Makeup Air Openin$Sizina Tabk for New and Existin�Dwellin�Units <br /> 4lne o:multiple power One a�multiple fan- Jne atrrrospherically vented Multiple atmospherically Duct di- <br /> vent,direct vent ap- assisted appliances and gas or oi!ap- vented gas�al ap- ameter <br /> pliances,or no com6us• power vent or direct venY p;iance ar one solid tuel pfiances or soiid fuel <br /> tiona,ppliances appliancesCalumri6 a,�pkanee appliartces <br /> Passiaeopening 1-36 1-22 1-TS 1-9 3 <br /> Passiveopening 37-•a"5 23--41 l6-28� 10--i1 <br /> PasSiveope�ring 67-109 42-66 r5-45 18-28 5 <br /> �asuveopaninq 110-163 fi7--IDO 47-64 29-42 6 <br /> Pasrveo enin 164-232 aQ1-143 JO-94 A3-51 7 <br /> Pass+ve enin 233-317 14A-i95 1�-135 62-83 8 <br /> Passive ope ning 318-419 190-258 13b-179 84-110 4 <br /> w�mo4arized dam r <br /> Qass'rveopening 420-539 �59-332 180-Z3� I11-142 10 <br /> w(moiwized dam _r <br /> Passiveoperdng 540-679 333-41� 231-?9'v 143-17n 21 <br /> w/motorized damper <br /> Aowered makeup air >679 >419 >230 >179 P!A <br /> Notes: <br /> A.M eq uivalent�ength of 300 feet c�i round smooth metal ducf is assurntl.Subtract AO feet for the exterirr hnod and[en feet for each 4t1 degree�tbow tp <br /> determine the rernaining length of straight duct allowable. <br /> B.ff flexible du<t is used,increase the dtxt diameter by ane inch.Ftexible duct shall6e strefched with minimal sags.Campressed duct shall not be accepted. <br /> C..Barometnc dampers are prohibited in paszive makeup aSr openings when arry atmospherical#y verrtad appliance iz irista[led. <br /> D.Powered makeup aar shall be electrically interio�ked with thr iargest tMhaust systertr. <br /> Combustion air <br /> Nat required�er mechanital cude(No atmozpherit or power vented appl�ancesy <br /> �/ Passive{see dFGC Appendix�,Warksheat E-1} Size a�d fype �"�j�j g�J�"f�gy� <br /> Other,describe: <br /> Explanation-It rto atmospfieric or power�ented appliarxes are insta#led,che:k the appr�priate box,not required.If a power vtnted <br /> oraamosphericaily vented appliance installed,use lFGC App�ndix E,Wor-ksheet E-1{see be?pw).Please enter sixe and type.Combustian <br /> air vent supplies must communicate with thc appliartce or app€ianses that req4ire{hecpmbustion air. <br /> Sectfon P calculations fallow on the next 2 pages. <br />