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Direc,rions-!n order to determrne the makeup oir, Table 501.3.1 must be filled out(see belowJ. For most new insrallations, column A <br /> will be appropriate, however, if atmosphericolly vented appliances orsolid fuel appliances are installed, use the appropriate column. <br /> For existing dwellings, see/MC 501.3.3. 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 501.3.2 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 supply must be insta!led per!MC 501.3.2.3. <br /> �. � �� ���-� f� � % r.�.�-� �.-c.. <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 multipie power One or multiple fan- One atmospherically vent Multiple atmospherical- <br /> vent or direct vent ap- assisted appiiances and gas or oil appliance or ly vented gas or oil <br /> pliances or no combus- power vent or direct vent one solid fuel appliance appliances or solid fuel <br /> tion appliances appliances appliances <br /> Column C Co lumn D <br /> Column A Column B <br /> 1. <br /> 0.15 0.09 O.Q6 0.03 <br /> a)pressure factor <br /> (cfm/sf) <br /> b)conditioned floor area(sf)(including �- <br /> unfinished basements) •-�- �' � � <br /> Estimated House Infiltration(cfm):(la � r, <br /> x lb) '� ' <br /> 2.Exhaust Capacity <br /> a)continuous exhaust-only ventilation <br /> system(cfm);(not applicabie to ba- <br /> lanced ventilation sys[ems such as <br /> HRV) <br /> b)clothes dryer(cfm) 135 135 135 135 <br /> c)SO%of largest exhaust rating(cfm); <br /> Kitchen hood typically <br /> jnot applicable if recirculating system � l�l�? <br /> or if powered makeup air is electricaliy � <br /> interlocked and match to exhaust) <br /> d)SO%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); <br /> [2a+2b�+2c+2dJ � � � <br /> 3. Makeup Air Quantity(cfm) <br /> a)total exhaust capacity(from above) � l,� � <br /> b)estimated house infiltration(from <br /> � �. <br /> above) M <br /> Makeup Air Quantity(cfm); <br /> [3a-3b] � <br /> (if value is negative,no makeup air is ..�.�=-, � � <br /> needed) <br /> 4. For makeup Air Opening Sizing,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 /> 8. 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 atmosphericaliy vented gas or oil <br /> appiiances and solid fuel appliances. <br /> Page � of 6 <br />