Laserfiche WebLink
Directions-In order to determine the makeup air, Toble 501.3.1 must be filled out(see below). For most new installotions,cofumn A <br /> will be appropriate,however,if atmospherically vented appliances orsolid fuel appliances are installed,use the oppropriate column. <br /> _ For existing dwellings,see!MC 501.3.3. Please note,if the makeup air quantity is negative,no additional makeup air will 6e re- <br /> quired for ventrlation,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 make-up air supp(y must be installed per IMC 501.3.2.3. <br /> i 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 muitiple 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 /> Column C Column D <br /> Column A Column B <br /> 1. <br /> a)pressure factor 0.15 0.09 0.06 0.03 <br /> I (cfm/s� <br /> b)conditioned floor area(sf)(including f (� (� <br /> unfinished basements) iP "I ��7 <br /> Estimated House Infiltration(cFm):[la <br /> X�b� I ��� <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)dothes dryer(cfm) 135 135 135 135 <br /> � c)80%of�argest exhaust rating(cfm); <br /> Kitchen hood typically <br /> . (not applicable if recirculating system �J�/� <br /> or if powered makeup air is electricaily �'� <br /> interlocked and match to exhaust) <br /> d)80%of next largest exhaust rating <br /> (cfm�; bath fan typically NOt <br /> (not appiicable if recirculating system <br /> or if powered makeup air is electricaily Applicable <br /> interlocked and matched to exhaust) <br /> Total Exhaust Capacity(cfm); � <br /> (2a+2b+2c+2d] lL � <br /> 3.Makeup Air Quantity(cfm) , <br /> a)total exhaust capacity(from above) �'� <br /> b)estimated house infiltration(from <br /> a hove) .��� <br /> Makeup Air Quantity(cfm�; � <br /> [3a—3b) ` �;Ii� <br /> (if value is negative,no makeup air is � 1 <br /> needed) <br /> 4.For makeup Air Opening Sizing,refer A ' <br /> to Table 501.4.2 dr <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 /> 8. Use this column if there is one fan-assisted appliance per venting system.(Appiiances other than atmospherically vented appliances may also be in- <br /> ciuded.) <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 multipie atmosphericaily 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 />