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*000 <br />40� <br />1102 <br />A Use this column if there are other than fan -assisted or atmospherically vented gas or oil appliances or it there are no combustion <br />appliances. <br />B Use this column if there is one fan -assisted appliance per venting system, Other than atmospherically vented appliances may also be <br />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 <br />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 <br />vented gas or oil appliances and solid fuel appliances. <br />;0V <br />400/ <br />A0 <br />404 <br />Table 501.3.1 <br />Procedure <br />to Determine Makeup Air Quantity for Exhaust Equipment in Dwellings <br />Use the A ro "ate Column to Estimate House Infiltration <br />One or multiple power vent <br />One or multiple fan- <br />One atmospherically <br />Multiple atmospherically <br />or direct vent appliances or <br />assisted appliances and <br />vented gas or oil <br />vented gas or oil <br />no combustion appliances^ <br />power vent or direct vent <br />appliance or one solid <br />appliances or solid fuel <br />a liancesB <br />fuel a liancec J_ <br />a liances° <br />1 a <br />ressure factor cfmis <br />0,15 <br />0.09 <br />0,06 <br />0,03 <br />b) <br />conditioned floor area <br />(sfl (including <br />unfinished basements) <br />Estimated House <br />Infiltration (cfm): <br />�—� <br />1ax1b <br />2. <br />Exhaust Capacity <br />a) <br />continuous exhaust- <br />onlyventilation systems <br />(cfm): (not applicable <br />to balanced ventilation <br />systems such as HRV) <br />b) <br />clothes dryer WON" <br />135 <br />135 <br />135 <br />135 <br />c) <br />80% of largest exhaust <br />rating (cfm): (not <br />applicable if <br />� j�� <br />recirculating system or <br />�✓ <br />if powered makeup air <br />is electrically <br />interlocked and <br />matched to exhaust) <br />d) <br />80% of next largest <br />exhaust rating (cfm): <br />(�� <br />(not applicable if <br />recirculating system or <br />if powered makeup air <br />is electrically <br />interlocked and <br />matched to exhaust) <br />not applicable <br />Total Exhaust Capacity <br />(cfm): 2a+2b+2c+2d <br />�� <br />I <br />Makeup Asir <br />Requirement <br />a) <br />Total Exhaust Capacity <br />��'✓" <br />from abovel, <br />b) <br />Estimated House <br />Infiltration_ from above) <br />Makeup Air Quantity <br />(if value is negative, no <br />makeup air is needed) <br />4, <br />WONNOWN-066"" <br />For Makeup Air <br />Opening Sizing, refer to <br />Table 501.3.2 <br />A Use this column if there are other than fan -assisted or atmospherically vented gas or oil appliances or it there are no combustion <br />appliances. <br />B Use this column if there is one fan -assisted appliance per venting system, Other than atmospherically vented appliances may also be <br />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 <br />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 <br />vented gas or oil appliances and solid fuel appliances. <br />;0V <br />400/ <br />A0 <br />404 <br />