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• <br /> 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!MC 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 last line of section 0. 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 KAtR 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 ly vented 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 /> __-----r---Cottitt�2--- ---Column D--— <br /> Column A Column B <br /> 1. <br /> 0.15 0.09 0.06 0.63 <br /> a)pressure factor <br /> • <br /> (drn/sf) _ <br /> b)conditioned floor area(sf)(including 7 D <br /> • <br /> unfinished basements) _ <br /> Estimated House Infiltration(dm):(la 1/r /) <br /> lbl Q/ <br /> 2.Exhaust Capacity <br /> a)continuous exhaust-only ventilation <br /> system(dm);(not applicable to ba- <br /> lanced ventilation systems such as <br /> HRV) <br /> b)clothes dryer(cfm) 135 135 135 135 <br /> c)80%of largest exhaust rating(dm); <br /> Kitchen hood typically <br /> (npt applicable If recirculating system <br /> art(powered makeup air Is electrically <br /> Interlocked and match to exhaust) _ • <br /> dl B0%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 /> • <br /> Interlocked and matched to exhaust) <br /> Total Exhaust Capacity(dm); —®" <br /> F(2a+2b+2c+2d1 tp / .) • <br /> 3.Makeup Air Quantity(cfm) 4 <br /> a)total exhaust capacity(from above) <br /> b(estimated house Infiltration(from / / ` <br /> above) • 1 r'< . <br /> Makeup Air Quantity(dm); <br /> (3a—ub( • <br /> (if value Is negative,no makeup air is <br /> needed) <br /> 4.For makeup Air Opening Sizing,refer `/k <br /> to Table S01.4.2 <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 vent appliances may be used.) <br /> • <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 /> 0. 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 />