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Makeup Air Opening Table for New and Existing Dwelling <br /> Table 501.3.2 <br /> One or multiple power One or inultiple fan. One atmospherically Multiple atmospherically <br /> vent,direct vent ap• assisted appliances and vented Sas or o8 cap- vented gas or oil ap- Duct di- <br /> pliances,or no combus• power vent or direct pliance or one solid fuel pliances or solid fuel ameter <br /> tion appliances vent appliances appliance appliances <br /> Column A Column B Column C Column 0 <br /> Passive opening 1-36 1-22 1-Ss 1-9 3 <br /> Passive opening 37-66 23-41- 16-28 10-17 1 <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 /> Passive opening 164-232101-143 70-99 13-61 7 <br /> Passive opening 233-317 144-19S 100-13S 62-83 g <br /> Passive opening 318-419 196-2sa 136-179 84-130 9 <br /> w/motorized damper <br /> Passive opening 420-S39 259- <br /> wmotorked damper 332 180-230 111-142 10 <br /> Passive opening S40-679 333-419 231-290 143-179 11 <br /> w motorized damper <br /> Powered makeup air 1 %679 3-419 3-290 1-179 NA <br /> Notes: <br /> A. An equivalent length of 100 feet of round smooth metal duct is assumed.Subtract 40 feet for the exterior hood and ten feet for each 90-degree elbow to <br /> determine the remaining length of straight duct allowable. <br /> 6 If flexible duct%used,incrgase the duct diameter by one inch. Flexible duct shall be stretched with minimal sags. Compressed duct shall not be accepted. <br /> C. Barometric dampers are prohibited in passwe makeup au openings when any atmospherically vented appliance is installed. <br /> D. Powered makeup air shall be electricallyinterkscked with the largest exhaust system. <br /> Sections F . <br /> Combustion air <br /> Not required per mechanical code(No atmospheric or power vented appliances) <br /> Passive(see IFGC Appendix E,Worksheet E•1) Size and type .i <br /> Other,describe: <br /> Explanation-If no atmospheric or power vented appliances are installed,check the appropriate box,not required. If a power vented <br /> or atmospherically vented appliance installed,use IfGCAppendix E,Worksheet E-1(see below). Please enter size and type. Combus- <br /> tion air vent supplies must communicate with the appliance or appliances that require the combustion air. <br /> Section f calculations follow on the next I pages. <br /> Page 4 of 6 <br />