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Table 501.4.2 <br />Makeup Air 0PenPng SixingTable for New and Cxisting Dwelling Units <br />114rfml <br />L POWER ONE. MULTiPLEAPPLIANCLs <br />ATMOSPHERICALLY THAT.ARU <br />CT VEiNT ONE OR MULTIPLE FAN- VENTEp 6AS OR 0711 ATMOSE}li!~R[GA1 i Y <br />P'A5SIVE MAKEUP <br />OR NO ASSISTED APPLFAIVO) S APFLrANC pR c7rrE; vl VENT OEt aIL. AIR OPt~iVrE11G <br />rF]N AN FOWLR.Vi~NT an 6Cil.iLl l IJCE AFp1lANCi s OR SOLID <br />TYPEOF bPf~NINfIiSq DIRI CT V1 NTAPPLiA1+ICESa AE'PLEANCEc DUCT <br />ORwmm r_z_, FtJELApPIIANCESa �innnxr�n <br />87-66 <br />67-x.09 <br />..'q 7h-4 da - .. <br />�a o ening 263-617 <br />/a openiq , <br />ilotorizQcl <br />8r <br />4. <br />5 <br />7 <br />8 <br />19G 17J 84-110 9 <br />damper_ 420-539 259-33210 <br />1Sb-28p111-142 <br />vuith motorized <br />damper 540.679 363-419 .231»2:90 c <br />Powered makeup - 143-179 11 <br />a1rH >679 >419 <br />>296 <br />>179 Notapplicable <br />A. Use this column if there are other than fan -assisted or atmospherically vented gas or of Ignces or if theca are no combWtlan appliances, <br />B. Use this column if there is one An -assisted appliance per venting system, Other than atmospherically vented apptlances may also be included, <br />C, .Use this column if there is one atmospherics Ily vented (thor than fan-asslsted) gas or oil appliance per venting system or Ono solid fuel appliance, <br />D. Use this column a ifthere n are multiple.. atmos pherlcaily vented or off appliances using a common vent or if there are atmospherically vented <br />gas or oil appllanGes and solid fuel appliances, <br />F, An equivalent lengthof feetof mond smooth metal duct is assumed. Subtract 40 feet for the exterior hood and ten feetfor each 90 -degree <br />elbowto determinethe remaining length of straight ductallowabre, <br />F. Ifflexlhle ductis used, Increase •the duct diameter by one inch. Flexible ducCshafl be stretched with rnlnimal-sags. <br />G. Barometric dampers are prohibited in passive makeup air openings when any atraospherlcallyvented appliance Is installed, <br />H. Powered makeup air shall be elactrtca fly Interlocked with the largest exhaust; system, <br />