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Directions-In order fo determine the makeup oir, 7able 501.3.1 must be filled out(see belowJ. For mosT new installations,column A <br /> will be approprrate,however,if atmospherically vented applionces or solid fuel applionces are installed, use ihe oppropriate cofumn. <br /> For existing dwel!ings,see IMC 501.3.3. Please note, if the makeup air quantiTy is negotive,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 rigidJ to the last line of section D. The moke-up air supply must 6e installed per IMC 501.3.2.3. <br /> Table 501.3.1 <br /> PROCEDUf2E 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 veni ap- assisted appliances and gas or oil appliance or ly vented gas or oil <br /> pliances or no combus- power vent or direct vent one solid tuel appliance appliances or solid fuel <br /> tion appliances appliances appliances <br /> Column C Column D <br /> Column A Column B <br /> 1. <br /> a)pressure factor 0.15 0,09 0.06 0.03 <br /> �cfm/sfJ <br /> b)conditioned floor area(s�(induding � T'� � <br /> unfinished basementsj �7 <br /> Estimated House Infiltration(cfm):[la _�?Q <br /> x lb) ��� <br /> 2.Exhaust Capacity <br /> a)continuous exhaust-only ventilation <br /> system(dm);�not applicable to ba- �'� <br /> lanced venolauon systems such as • <br /> HRVj <br /> b)dothes dryer�cfm) 135 135 135 135 <br /> c)80%of largest exhaust rating(cfm); <br /> Kitchen hood typically L/q� <br /> (not applicable if recirculating system �G <br /> or if powered makeup air is electrically <br /> interlocked and match to exhaust) <br /> d)SO%of next largest exhaust rating -- <br /> (cfm); bath fan typically <br /> N ot <br /> (not applicabie if recirculating system <br /> or if powered makeup air is electrically Applicable <br /> interlocked and matched to exhaust) <br /> Total Exhaust Capacity(cfm); � /5 <br /> [2a+2b+2c+2d) <br /> 3.Makeup Air quantity(cfm) � <br /> a)total exhaust capacity(from above) � � <br /> b)es[imated house infiltration(from � ' <br /> above) � <br /> Makeup Air quantity(cfm); <br /> [3a—36) � <br /> (if value is negative,no makeup air is � <br /> needed) <br /> 4.For makeup Air Opening Sizing,reter <br /> to Tablc 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 ven[appliances may 6e used.) <br /> B. Use this column if there is one fan-assisted appliance per venting system.(Appliances other[han atmospherically vented appliances may also 6e in- <br /> duded.) <br /> C. Use this column if there is one a[mospherically vented(other than farnassisted)gas or oil appiiance per venting system or one solid fuel appliance. <br /> D. Use this column if there are multiple a[mospherically vented gas or oil appliances using a common vent or if there are atmospherically vented gas or oil <br /> appliances and solid fuel appliances. <br /> Page3of6 <br />