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1 I <br /> Table 501.3.1 <br /> Procedure to Determine Makeup Air Quantity for Exhaust Equipment in Dwellings <br /> Use the Appropriate Column to Estimate House infiltration <br /> One or multiple power vent or One or multiple fan-assisted One atmospherically vented Multiple atmospherically <br /> direct vent appliances or no appliances and power vent or gas oral appliance or one vented gas or oil appliances <br /> combustion appliancesA direct vent appliancesB solid fuel applianceC or sold fuel appliancesD <br /> t a)pressure(actor(cfmisf) 0.15 0.09 0.06 0.03 <br /> b)conditioned Poor area(sf) <br /> (Including unfinished basements) 5154 0 <br /> Estimated House Infiltration <br /> (dm).[ta x ib) 773.1 0 0 0 <br /> 2-a)Exhaust Capacity <br /> continuous exhaust-only <br /> ventilation systems(cfm):(not <br /> applicable to balanced ventilation <br /> systems such as HRV) 0 0 0 0 <br /> b)clothes dryer 135 135 135 135 <br /> 080%of largest exhaust rating <br /> (cfm);(not applicable if <br /> recirculating system or if powered <br /> makeup air is electrically <br /> interlocked and matched to <br /> exhaust) 480 0 _ __ 0 <br /> d)80%of next largest exhaust <br /> rating(cfm):(not applicable if <br /> recirculating system or If powered <br /> makeup skis electrically <br /> interlocked and matched to <br /> exhaust) 0 0 0 <br /> Total Exhaust Capacity(cfm): <br /> (2a+21i.2c+2d) 615 135 135 135 <br /> 3 a)Makeup Air Requirement <br /> Total Exhaust Capacity(Irom <br /> above) 615 135 135 135 <br /> b)Estimated House Infiltration <br /> (from above) 773.1 0 0 0 <br /> Makeup Air Quantity(elm):(3a— <br /> 3b)(4 value Is negative,no <br /> makeup air is needed) -168.1 135 135 135 <br /> 4.For Makeup Air Opening <br /> Sizing,refer to Table 501.3.2 <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 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 /> Table 301.3.2 <br /> Makeup Air Opening Sizing Table for New and Existing Dwellings <br /> One atmospherically Multiple atmospherically Passive <br /> One or multiple power vent One or multiple fan-assisted vented gas or oil appliance vented gas or oil makeup air <br /> or direct vent appliances or appliances and power vent or one solid fuel appliances or solid fuel opening duct <br /> no combustion apptiancesA or direct vent appliancesB applianceC appliancesD diameterE,F,G <br /> Type of opening or system (cfm) (cfm) (cfm) (cfm) (inches) <br /> Passive Opening 1-36 1-22 1-15 1-9 3 <br /> Passive Opening 37-66 23-41 16-28 10-17 4 <br /> Passive Opening 67-109 _ 42-66 29-46 18-28 5 <br /> Passive Opening 110-163 67-100 47-69 29-42 6 <br /> Passive Opening 164-232 101-143 70-99 43.61 7 <br /> Passive Opening 233-317 144-195 100-135 62-83 8 <br /> Passive Opening with <br /> Motorized Damper 318-419 196-258 136-179 84-110 9 <br /> Passive Opening with <br /> Motorized Damper 420-539 259-332 180-230 111-142 10 <br /> Passive Opening with <br /> Motorized Damper 540-679 333-419 231-290 143-179 11 <br /> Powered Makeup AirH >679 >419 >290 >179 not applicable <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 <br /> appliances. <br /> B Use this column It 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 them Is one atmospherically vented(other than tan-assisted)gas or oil appliance per venting system or one solid fuel <br /> appliance. <br /> D Use this column inhere are multiple atmospherically vented gas or oil appliances using a common vent or[(there are atmospherically <br /> vented gas or oil appliances and solid fuel appliance(s). <br /> E An equivalent length of 100 feel of round smooth metal duct Is assumed.Subtract 40 feet for the exterior hood and ten feet for each 90- <br /> degree elbow to determine the remaining length of straight duct allowable. <br /> F If flexible duct Is used,Increase the duct diameter by one inch.Flexible duct shall be stretched with minimal sags. <br /> G Barometric dampers are prohibited in passive makeup air openings when any atmospherically vented appliance Is installed. <br /> H Powered makeup air shall be etectrIcally Interlocked with the largest exhaust system <br />