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• <br /> EXHAUST SYSTEMS. - <br /> • <br /> Z <br /> TABLE 501.4.2 NM <br /> MAKEUP AIR OPENING SIZING TABLE FOR NEW AND EXISTING DWELLING UNITS M <br /> ONE MULTIPLE APPLIANCES al <br /> ONE OR MULTIPLE POWER ONE OR MULTIPLE FAN- ATMOSPHERICALLY THAT N <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 N <br /> COMBUSTION DIRECT VENT SOLID FUEL APPLIANCES OR SOLID OPENING D;FCT M <br /> TYPE OF OPENING APPLIANCES" APPLIANCES' APPLIANCE` FUEL APPLIANCES° DIAMETER ° N <br /> OR SYSTEM (dm) (elm) (dm) (etre) (Inches) M <br /> Passive opening 1-36 1-22 • 1-15 1-9 3 N <br /> M <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 M <br /> Passive opening 110-163 67-100 47-69 29-42 ° N <br /> Passive opening 164-232 101-143 70-99 M 43-61 7 M <br /> Passive opening 233-317 _ 144-195 100-135 62-83 8 M <br /> p N <br /> Pa <br /> withemotorized 318-419 196-258 136-179 84-110 9 M <br /> N <br /> damper M <br /> H <br /> hi <br /> Passive opening <br /> with motorized 420-539 259-332 180-230 111-142 10 M N <br /> • <br /> damper _. _ - M <br /> N <br /> Passive opening M <br /> with motorized - 540-679 333-419 231-290 143-179 11 N <br /> M <br /> N N <br /> damperN <br /> Not <br /> Powered makeup >679 >419 >290 >179 M <br /> applicable M <br /> A.Use this column if there are other thanfan-assisted or atmospherically vented gas or oil appliances or if there are no combustion appliances. N <br /> B.Use this column if there 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. M <br /> D.Use this column if there are multiple atmospherically vented gas or oil appliances using a common vent or if there are atmospherically vented gas or oil w <br /> . appliances and solid fuel appliances. <br /> H. An equivalent length of 100 feet of round smooth metal duct is assumed.Subtract 40 feet for the exterior hood and ten feet far each 90-degree elbow to N <br /> determine the remaining length of straight duct allowable. N <br /> F. If flexible duct is used,increase the duct diameter by one inch.Flexible duct shall be stretched with minimal sags. MN <br /> 4,Barometric dampers are prohibited in passive makeup air openings when any atmospherically vented appliance is installed n <br /> H.Powered makeup air shall be electrically interlocked with the largest exhaust system. M <br /> • 2015 MINNESOTA MECHANICAL CODE 37 . <br />