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Directions-In order to determine the makeup air, Table 501.3.1 must be filled out(see below). For most new installations,column A <br /> will be appropriate,however,if atmospherically vented appliances or solid fuel appliances are installed,use the appropriate column. <br /> For existing dwellings,see IMC 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 lost line of section D. The make-up air supply must be installed per IMC 501.3.2.3. <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 multiple power One or multiple fan- One atmospherically vent Multiple atmospherical- <br /> vent or direct vent ap• assisted appliances and gas or oil appliance or lyvented 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 Column D <br /> Column A Column B <br /> 1. <br /> a)pressure factor 0.15 0.09 0.06 0.03 <br /> (dm/sf) <br /> b)conditioned floor area(sf)(including <br /> unfinished basements) <br /> Estimated House Infiltration(cfm):Ila <br /> — <br /> %lb) <br /> 2.Exhaust Capacity <br /> a)continuous exhaust-only ventilation <br /> system(cfm);(not applicable to ba. <br /> lanced ventilation systems such as <br /> HRV) <br /> b)clothes dryer(cfm) 135 <br /> 135 135 135 <br /> c)80%of largest exhaust rating(cfm); <br /> Kitchen hood typically <br /> (not applicable if recirculating system <br /> or if powered makeup air is electrically <br /> Interlocked and match to exhaust) <br /> d)80%of next largest exhaust rating <br /> (dm); 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(dm); <br /> (2a+2b+2c+2d) <br /> 3.Makeup Air Quantity(cfm) <br /> a)total exhaust capacity(from above) <br /> b)estimated house infiltration(from <br /> above) <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 l( <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 /> B. 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 atmospherically vented gas or oil <br /> appliances and solid fuel appliances. <br /> Page 3 of 6 <br />