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Directions-In order to determine the makeup air,Table 501.3.1 must be filled out(see below). For most new installations,column A <br /> will be appropriate,however,if atmospherically vented appliances or solid fuel appliances are installed,use the appropriate column. <br /> For existing dwellings,see IMC 301.3.3. Please note,if the makeup air quantity is negative,no additional makeup air will be re- <br /> quired for ventilation,if the value is positive refer to Table 501.3.1 and size the opening. Transfer the cfm,size of opening and type <br /> (round,rectangular,flexor rigid)to the last line of section D. The make-up air supply must be installed per IMC 501.3.1.3. <br /> Table 501.3.1 <br /> PROCEDURE TO DETERMINE MAKEUP AIR QUANITY FOR EXHAUST EQUIPMENT 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 cap- assisted appliances and gas or oil appliance or ly vented gas ar oll <br /> plianoes or no wmbus- power vert or direct vent one solid fuel appliance appliances or solid fuel I <br /> tion appliances appliances appliances i <br /> Column C Column U <br /> Column A Column B <br /> 3 <br /> 1. 1 <br /> 0.15 0.09 0.06 0.03 r <br /> a)pressure factor <br /> (cfmisf) <br /> b)conditioned floor area(sf)(including <br /> unfinished basements) �u2 <br /> Q 3 1 <br /> Estimated house Infiltration(cfm)!(la ' <br /> x 1bj <br /> 2.Exhaust Capacity {{ <br /> a)continuous exhaust-only venttla � I <br /> system(cfm);(not applicable to ba-- } <br /> lanced ventilation systems such as 1 <br /> d <br /> HRV) <br /> b)clothes dryer(cfm) 135 135 135 13S <br /> c)80%of largest exhaust rating(cfm); <br /> Kitchen food typically / <br /> (not applicable if recirculating system <br /> or if powered makeup air is electrically <br /> interlocked and match to exhaust <br /> ot next rat ng i <br /> (cfm); bath fan typically t <br /> (not applicable if recirculating system ;A;pplicable <br /> or if powered makeup air is electricallyinterlockedo ust Pacity(dm);(2a+2b+2c+2d) <br /> 3.Makeup Air Quantity(cfm) <br /> a)total exhaust capacity(from above) <br /> b)estimated house Infiltration(from <br /> above) t F <br /> Makeup Air Quantity(cfm); <br /> (3a-3b) <br /> (if value is negative,no makeup a ? 1 <br /> needed) J l <br /> 4.For makeup Air Opening Sizin refer <br /> to Table 501.4.2 <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 the column if there isone fan-assisted appliance per venting system.(Appliances other than atmospherically vented appliances may also be in- o <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. i <br /> 1 <br /> 1 <br /> Page 3 of 6 <br />