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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 ap liances,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 directvent appliances fuel appliance or solid fuel appliances <br /> Column D <br /> Column A Column B Column C <br /> i• 0.15 0.09 0.06 0.03 <br /> a)pressure factor <br /> (cfm/s� <br /> b)conditioned floor area(sf)(including 6415 <br /> unflnished basements) <br /> Estimated House Infiltretion(cfm):[la 962 <br /> x lb] <br /> 2.Exhaust Capacity <br /> a)continuous exhaust-onty ventilation system ERV=O <br /> (dm);(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 NPically 'Z4� <br /> (not applicable if recirculating system or if <br /> powered makeup air is electrically lnterlocked <br /> d)80%of nezt largest exhaust rati� NOt <br /> (cfm);bath fan typically AppliCable <br /> (not applicable if recirculating system or if <br /> powered makeup air is electriwlly interlocked <br /> Total Exhaust Capacity(cfm�; 375 <br /> [2a+2b+2c+2d] <br /> 3.Makeup Air Quantiry�cfm) 375 <br /> a)total exhaust capacity(from above) <br /> b)estimated house infiltration(from 962 <br /> above) <br /> Makeup Air Quantity(cfm�; <br /> [3a—3b] _�/�� <br /> (if value is negative,no makeup air is needed) �� <br /> 4.FormakeupAirOpening5izing,refer NOT REQ�� <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 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 atmosphericalty vented gas or oil appliances and solid <br /> fule appliances. <br />