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• <br /> EXHAUST SYSTEMS• <br /> • <br /> • <br /> M <br /> TABLE 501.4.2 N <br /> MAKEUP AIR OPENING SIZING TABLE FOR NEW AND EXISTING DWELLING UNITS N <br /> M <br /> ONE MULTIPLE APPLIANCES N <br /> ONE OR MULTIPLE POWER ONE OR MULTIPLE FAN- ATMOSPHERICALLY THAT H <br /> VENT OR DIRECT VENT ASSISTED APPLIANCES VENTED GAS OR OIL ARE ATMOSPHERICALLY M <br /> APPLIANCES OR NO AND POWER VENT OR APPLIANCE OR ONE VENTED GAS OR OIL PASSIVE MAKEUP AIR u <br /> • <br /> COMBUSTION DIRECT VENT SOLID FUEL APPLIANCES OR SOLID OPENING DUCT N <br /> TYPE OF OPENING APPLIANCES" APPLIANCES° APPLIANCE° FUEL APPLIANCES° DIAMETER4 F.° N <br /> OR SYSTEM (efm) (cfm) . (efm) (cfm) (Inches) N <br /> Passive opening 1-36 1-22 • 1-15 1-9 3 N <br /> Passive opening 37-66 23-41 16-28 10-17 4 N <br /> M <br /> Passive opening 67-109 • 42-66 29-46 18-28 5 N <br /> M <br /> Passive opening 110-163 67-100 47-69 29-42 6 N <br /> Passive opening 164-232 101-143 70-99 • 43-61 7 M <br /> Passive opening 233-317 144-195 100-135 62-83 8 14 <br /> Passive opening N <br /> with motorized 318-419 196-258 136-179 84-110 9 M <br /> N <br /> damper H <br /> M <br /> Passive opening N <br /> with motorized 420-539 259-332 180-230 111-142 10 N <br /> damper H <br /> Passive opening N <br /> with motorized 540-679 333-419 231-290 143-179 11 N <br /> 14 <br /> damper <br /> Powered makeup Not N M <br /> >679 >419 >290 >179 hcable M <br /> aPP b' <br /> A.Use this column if there are other than fan-assisted or atmospherically vented gas or ort appliances or if there ate no combustion appliances. N <br /> B.Use this column if these is one fan-assisted appliance per venting system.Other than atmospherically vented appliances may also be included. m <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. N <br /> D.Use this column if there are multiple atmospherically vented gas or on appliances using a common vent or if there are atmospherically vented gas or of M <br /> . appliances and solid fuel appliances. H <br /> B. An equivalent length of 100 feet of round smooth metal duct is assumed.Subtract 40 feet for the exterior hood and ten feet for each 90-degree elbow to N <br /> determine the remaining length of straight duct allowable. M <br /> P. If flexible duct is used,increase the duct diameter by one inch.Flexible duct shall be stretched with minimal sags. m <br /> G.Barometric dampers are prohibited in passive makeup air openings when any atmospherically vented appliance Is installed. M <br /> H.Powered makeup air shall be electrically interlocked with the largest exhaust system. M <br /> - 2015 MINNESOTA MECHANICAL CODE 37 <br />