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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 multiple fan One atmospherically Multiple atmospherically <br /> vent,direct vent ap- assisted appliances and vented gas or oil ap- 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 D <br /> Passive opening 1—36 1—22 1—15 1—9 3 <br /> Passiveopening 37-66 23-41 16-28 10-17 4 <br /> Passiveopening 67-109 42-66 29-46 18-28 5 <br /> Passiveopening 110-163 67-100 47-69 29-42 6 <br /> Passiveopening 164-232 101-143 70-99 43-61 7 <br /> Passiveopening 233-317 144-195 100-135 62-83 8 <br /> Passiveopening 318-419 196-258 136-179 84-110 9 <br /> w/motorized damper <br /> Passive opening 420—539 259—332 180—230 il l—142 10 <br /> w/motorized damper <br /> Passive opening 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 metai duct is assumed. Subtrect 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 /> B. If flexible dud is used,increase the duct diameter by one inch. Flexible dud shall be stretched with minimal sags. Compressed duct shall not be accepted. <br /> C. earometric dampers are prohibited in passive makeup air openings when any atmosphericaily vented appliance is installed. <br /> D. Powered makeup air shall be electrically interlocked 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 A endix E Worksheet E-1 Size and type <br /> otner,describe: 5" rigid or 6"flex <br /> Explanation-If no atmospheric or power vented appfionces 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 be/ow). Please enter size and type. Combus- <br /> tion air vent supplies must communicote with the appliance or appliances that require the combustion air. <br /> Section F calculations follow on the next 2 pages. <br /> � <br />