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Dircctions-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 appropriau,however,if <br /> atmospherically vented appUances or solid fuel appliances are installed,use the appropriate column.Please note,if the makeup afr 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.Trensfer the cfm,size of opening and type(round,rectangular,flex or rlgid)to <br /> the last Ilne of sedion 0. <br /> Table 501.4.1 <br /> PROCEDURE TO DETERMINE MAKEUP AIR QUANITY FOR EXHAUST EQUIPMENT IN DWELLINGS <br /> Additional combustion air will be re uired for combustion a Ifances,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 applia�ce 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�pressurefactor <br /> (cfm/s� <br /> b)conditioned floor area�sfl(including 5975 <br /> unfinished basements) <br /> Estimated House Inflltration(cfm):[Sa 896 <br /> x lb] <br /> 2.6chaust Gpacity <br /> a)continuousexhaustonlyventilationsystem ERV = 0 <br /> (cfm);(not applicable to ba-lanced ventflation <br /> systems such as HRV) <br /> b)clothes dryer(dm► 135 135 135 135 <br /> c)80%of largest exhaust reting(cfm); <br /> Kitchen hood typically 'L40 <br /> (not applicable if recirculating system or if <br /> powered makeup air is electrically interl«ked <br /> d)80%of next largest exhaust rating NOt <br /> (dm);bath fan typically Applicable <br /> (not applicable H rccirculating system or If <br /> powered makeup air is electHwlly interiocked <br /> Towl Exhaust Upacity(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 infiltretion(from 896 <br /> above) <br /> Makeup Air Quantity(cfm�; <br /> [3a-3b] -521 <br /> (if value Is negative,no makeup air Is needed) <br /> 4.FormakeupAirOpening5izing,refer NOT REQ. <br /> to Table 501.41 <br /> A.Use this column if there are other than fanassisted or atmospherically vented gas or oil appliance or if there are no combustion appliances.(Power vent and direct vent <br /> appllances may be used.) <br /> B.Use this column if there Is one fan-assisted appliance per venting system.(Appliances oiher 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 ofl appliance per venting system or one solid fuel appliance. <br /> D.Use this column if tl�ere 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 />