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� , <br /> ' Directions-!n order to determine the makeup air, Table 501.3.1 must be filled out(see belowJ. For most new installations, co/umn A <br /> will be appropriate,however,if atmospherically vented appliances or solid fue/appliances are installed, use the appropriate co/umn. <br /> for existing dwellings,see IMC 501.3.3. Please note,if the makeup air quantity is negotive, no additiona!makeup air will be re- <br /> quired for ventilation,if the va/ue is positive refer to Table 501.3.2 and size the opening. Transfer the cfm,size of opening and type <br /> (round,rectangular,flex or rigid)to the last line of section D. The make-up air supp/y must be installed per IMC 501.3.2.3. <br /> Table 501.3.1 <br /> PROCEDURE TO DETERMINE MAKEUP AIR QUANITY FOR EXHAUST E4UIPMENT IN DWELLINGS <br /> (Additional combustion air will be required for combustion appliances,see KAIR method for calculations) <br /> One or multiple power One or multiple fan- One atmospherically vent Multiple atmospherical- <br /> vent or direct vent ap- assisted appliances and gas or oil appliance or ly vented gas or oil <br /> piiances or no combus- power vent or direct vent one solid fuel appliance appiiances or solid fuel <br /> tion appliances appliances appliances <br /> Column C Column D <br /> Column A Column B <br /> 1. <br /> a)pressure factor 0.15 0.09 0.06 0.03 <br /> (cfm/sf) <br /> b)conditioned floor area(s�(including 2978 <br /> unfinished basements) <br /> Estimated House Infiltration(cfm�:[la �6 <br /> x lb] <br /> 2.Exhaust Capacity <br /> a)continuous exhaust-only ventilation 160 <br /> system(cfm);(not applicable to ba- <br /> lanced ventilation systems such as <br /> HRV) <br /> b)clothes dryer(cfm) 135 135 135 135 <br /> c)80Y of largest exhaust rating(cfm►; <br /> Kitchen hood typically 64 <br /> (not applicable if recirculating system <br /> or if powered makeup air is electrically <br /> interlocked and match to exhaust) <br /> d)80�of next largest exhaust rating <br /> (cfm); bath fan typically NOt <br /> (not applicable if recirculating system <br /> or if powered makeup air is electrically Applicable <br /> interlocked and matched to exhaust) <br /> Total Exhaust Capacity(cfm); 359 <br /> (2a+2b+2c+2d] <br /> 3.Makeup Air Quantity(cfm) <br /> a)total exhaust capacity(from above) 359 <br /> b)estimated house infiltration(from <br /> above) `�6 <br /> Makeup Air Quantity(cfm); <br /> [3a—3b] _87 <br /> �if value is negative,no makeup air is <br /> needed) <br /> 4.For makeup Air Opening Sizing,refer <br /> to Tabie 501.4.2 Not Required <br /> A. Use this column if there are other than fan-assisted or atmospherically vented gas or oil appliance or if there are no combustion appliances.(Power vent <br /> and direct vent appliances may be used.) <br /> B. Use this column if there is one fan-assisted appliance per venting system.(Appliances other than atmospherically vented appliances may also be in- <br /> cluded.) <br /> C. Use this column if there is one atmospherically vented(other than fan-assisted)gas or oil appliance per venting system or one solid fuel appliance. <br /> D. Use this column if there are multiple atmospherically vented gas or oil appliances using a common vent or if there are atmospherically vented gas or oil <br /> appliances and solid fuel appliances. <br />