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Procedure to Determine Makeup Air Quantity for Exhaust Equipment in Dwellings <br /> One or multiple One or multiple One Multiple <br /> power vent fan-assisted atmospherically atmospherically <br /> or direct vent appliances and vented gas or oil vented gas or oil <br /> appliances or power vent appliance appliances <br /> no combustion or direct vent or one solid or solid fuel <br /> appllances°' appliances° fuel appliance° appliances° <br /> 1. Use the Appropriate Column <br /> to Estimate House Infiltration <br /> a) pressure factor(cfm/sf) 0.15 0.09 0.06 0.03 <br /> b)conditioned floor area (sf) 4016 <br /> (Including unfinished basements) <br /> Estimated House Infiltration (cfm): [1a x 1b] ibi(to <br /> - 2. Exhaust Caoacitv <br /> a)continuous exhaust-only ventilation system(cfm) <br /> (not applicable to balanced ventilation systems such as HRV) <br /> uj�.i. iCa ui <<,;,uij 135 135 135 135 <br /> c)80%of largest exhaust rating (cfm) <br /> (not applicable it recirculating system or <br /> it powered makeup air is electrically interlocked a d matched to exhaust) <br /> d)80%of next largest exhaust rating(cfm) Not Applicable <br /> (not applicable if recirculating system or <br /> it powered makeup air is electrically interlocked and matched to exhaust) ��� <br /> Total Exhaust Capacity(cfm): [2a+2b+2c+2d] <br /> 3. Makeup Air Requirement <br /> a)Total Exhaust Capacity(from above) ��c <br /> b)Estimated House Infiltration(from above) )4%1 <br /> Makeup Air Quantity(cfm): [3a-3b] <br /> (If value is negative,no makeup air is needed) <br /> 4. For Makeup Air Opening Sizing, refer to Table M501.3.2 <br /> A. Use this column if there are other than fan-assisted or atmospherically vented gas or oil appliances or if there are no combustion appliances. <br /> B. Use this column if there is one fan-assisted appliance per senting system. Other than atmospherically vented appliances may also be 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 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 vetted <br /> gas or oil appliances and solid fuel appliance(s). <br />