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Directions-In order to determine the makeup air,Table 501.4.1 must be filled out(see below).For most new installations,column A will be appropriate,however,if <br /> atmospherically vented appliances or solid fuel appliances are installed,use the appropriate column. Please note,if the makeup air quantity is negative,no additional makeup air <br /> will be required for ventilation,if the value is positive refer to Table 501.4.2 and size the opening.Transfer the cfm,size of opening and type(round,rectangular,flex or rigid)to <br /> the last line of section D. <br /> Table 501.4.1 <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 ap-pliances assisted appliances and power gas or oil appliance or one solid ly vented gas or oil appliances <br /> or no combus-tion appliances vent or direct vent appliances fuel appliance or solid fuel appliances <br /> Column D <br /> Column A Column B Column C <br /> 1. 0.15 0.09 0.06 0.03 <br /> a)pressure factor <br /> (cfm/sf) <br /> b)conditioned floor area(sf)(including 4776 <br /> unfinished basements) <br /> Estimated House Infiltration(cfm):(la 716 <br /> x lb] <br /> 2.Exhaust Capacity <br /> a)continuous exhaust-only ventilation system ERV = 0 <br /> (cfm);(not applicable to ba-lanced ventilation <br /> systems such as HRV) <br /> b)clothes dryer(cfm) 135 135 135 135 <br /> c)80%of largest exhaust rating(cfm); <br /> Kitchen hood typically 240 <br /> (not applicable if recirculating system or if <br /> powered makeup air is electrically interlocked <br /> d)80%of next largest exhaust rating Not <br /> (cfm);bath fan typically Applicable <br /> (not applicable if recirculating system or if <br /> powered makeup air is electrically interlocked <br /> Total Exhaust Capacity(cfm); 375 <br /> [2a+2b+2c+2d] <br /> 3.Makeup Air Quantity(cfm) 375 <br /> a)total exhaust capacity(from above) <br /> b)estimated house infiltration(from 716 <br /> above) <br /> Makeup Air Quantity(cfm); <br /> [3a-3b] -341 <br /> (if value is negative,no makeup air is needed) <br /> 4.For makeup Air Opening Sizing,refer <br /> to Table 501.4.2 NOT REQ <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 and direct vent <br /> 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 included.) <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 appliances and solid <br /> fule appliances. <br />