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Chimneys and Vents (18-28-801 et seq.)

Municipal Code of Chicago tit. 18, ch. 18-28, art. VIII
in effect

Municipal Code of Chicago § 18-28-801.1 Scope.

18-28-801.1 Scope. This article shall govern the installation, maintenance, repair and approval of factory-built chimneys, chimney liners, vents and connectors, and the utilization of masonry chimneys.

Municipal Code of Chicago § 18-28-801.2 General.

18-28-801.2 General. Every fuel-burning appliance shall discharge the products of combustion to a vent, factory-built chimney or masonry chimney, except for appliances exempted by Section 18-28-804. The chimney or vent shall be designed for the type of appliance being vented.

Municipal Code of Chicago § 18-28-801.2.1 Oil-fired appliances.

18-28-801.2.1 Oil-fired appliances. Oil-fired appliances shall be vented in accordance with this chapter and NFPA 31. (Amend Coun. J. 9-14-21, p. 35949, Art. VIII, § 1)

Municipal Code of Chicago § 18-28-801.3 Masonry chimneys

18-28-801.3 Masonry chimneys Masonry chimneys shall be constructed in accordance with the Chicago Building Code. (Amend Coun. J. 9-14-21, p. 35949, Art. VIII, § 1)

Municipal Code of Chicago § 18-28-801.4 Positive flow.

18-28-801.4 Positive flow. Venting systems shall be designed and constructed so as to develop a positive flow adequate to convey all combustion products to the outside atmosphere.

Municipal Code of Chicago § 18-28-801.5 Design.

18-28-801.5 Design. Venting systems shall be designed in accordance with this article or shall be approved engineered systems as determined by the Committee of Standards and Tests.

Municipal Code of Chicago § 18-28-801.6 Minimum size of chimney or vent.

18-28-801.6 Minimum size of chimney or vent. Except as otherwise provided for in this article, the size of the chimney or vent serving a single appliance, except for approved engineered systems, shall have a minimum free area equal to the area of the appliance connection.

Municipal Code of Chicago § 18-28-801.7 Solid fuel appliance flues.

18-28-801.7 Solid fuel appliance flues. The cross-sectional area of a flue serving a solid fuel-burning appliance shall not be greater than three times the cross-sectional area of the appliance flue collar or flue outlet.

Municipal Code of Chicago § 18-28-801.9 Positive pressure.

18-28-801.9 Positive pressure. If an appliance equipped with a forced or induced draft system creates a positive pressure in the venting system, the venting system shall be designed for positive pressure applications.

Municipal Code of Chicago § 18-28-801.10 Connection to fireplace.

18-28-801.10 Connection to fireplace. Connection of appliances to chimney flues serving fireplaces shall be in accordance with Sections 18-28-801.10.1 through 18-28-801.10.3.

Municipal Code of Chicago § 18-28-801.10.1 Closure and access.

18-28-801.10.1 Closure and access. A noncombustible seal shall be provided below the point of connection to prevent entry of room air into the flue. Means shall be provided for access to the flue for inspection and cleaning.

Municipal Code of Chicago § 18-28-801.10.2 Connection to factory-built fireplace flue.

18-28-801.10.2 Connection to factory-built fireplace flue. An appliance shall not be connected to a flue serving a factory-built fireplace unless the appliance is specifically listed for such installation. The connection shall be made in accordance with the appliance manufacturer's installation instructions.

Municipal Code of Chicago § 18-28-801.10.3 Connection to masonry fireplace flue.

18-28-801.10.3 Connection to masonry fireplace flue. A connector shall extend from the appliance to a flue serving a masonry fireplace such that the flue gases are exhausted directly into the flue. The connector shall be provided with access or shall be removable for inspection and cleaning of both the connector and the flue. Listed direct connection devices shall be installed in accordance with their listing.

Municipal Code of Chicago § 18-28-801.11 Multiple solid fuel prohibited.

18-28-801.11 Multiple solid fuel prohibited. A solid fuel-burning appliance or fireplace shall not connect to a chimney passageway venting another appliance.

Municipal Code of Chicago § 18-28-801.12 Chimney entrance.

18-28-801.12 Chimney entrance. Connectors shall connect to a chimney flue at a point not less than 12 inches (305 mm) above the lowest portion of the interior of the chimney flue.

Municipal Code of Chicago § 18-28-801.13 Cleanouts.

18-28-801.13 Cleanouts. Masonry chimney flues shall be equipped with a cleanout opening that has a minimum height of 6 inches (152 mm). The upper edge of the opening shall be located not less than 6 inches (152 mm) below the lowest chimney inlet opening. The cleanout shall be provided with a tight-fitting, noncombustible cover. Exceptions: Cleanouts shall not be required for chimney flues that serve masonry fireplaces if the flues are provided with access through the fireplace opening.

Municipal Code of Chicago § 18-28-801.14 Connections to exhauster.

18-28-801.14 Connections to exhauster. All appliance connections to a chimney or vent equipped with a power exhauster shall be made on the inlet side of the exhauster. All joints on the positive pressure side of the exhauster shall be sealed to prevent flue-gas leakage as specified by the manufacturer's installation instructions for the exhauster.

Municipal Code of Chicago § 18-28-801.15 Fuel-fired appliances.

18-28-801.15 Fuel-fired appliances. Masonry chimneys utilized to vent fuel-fired appliances shall be located, constructed and sized as specified in the manufacturer's installation instructions for the appliances being vented.

Municipal Code of Chicago § 18-28-801.16 Flue lining.

18-28-801.16 Flue lining. Masonry chimneys shall be lined. The lining material shall be compatible with the type of appliance connected, in accordance with the appliance listing and the manufacturer's installation instructions. Listed materials used as flue linings shall be installed in accordance with the conditions of the listing and the manufacturer's installation instructions.

Municipal Code of Chicago § 18-28-801.16.1 Residential and low-heat appliances (general).

18-28-801.16.1 Residential and low-heat appliances (general). Flue lining systems for use with residential-type and low-heat appliances shall be limited to the following: 1. Clay flue lining complying with the requirements of ASTM C 315 or the equivalent. Clay flue lining shall be installed in accordance with the Chicago Building Code. 2. Listed chimney lining systems complying with UL 1777. 3. Other approved materials that will resist, without cracking, softening or corrosion, flue gases and condensate at temperatures up to 1,800°F. (982°C.). (Amend Coun. J. 9-14-21, p. 35949, Art. VIII, § 1)

Municipal Code of Chicago § 18-28-801.17 Space around lining.

18-28-801.17 Space around lining. The space surrounding a flue lining system or other vent installed within a masonry chimney shall not be used to vent any other appliance. This shall not prevent the installation of a separate flue lining in accordance with the manufacturer's installation instructions and the Chicago Building Code. (Amend Coun. J. 9-14-21, p. 35949, Art. VIII, § 1)

Municipal Code of Chicago § 18-28-801.18 Existing chimneys and vents.

18-28-801.18 Existing chimneys and vents. Where an appliance is permanently disconnected from an existing chimney or vent, or where an appliance is connected to an existing chimney or vent during the process of a new installation, the chimney or vent shall comply with Sections 18-28-801.18.1 through 18-28-801.18.4.

Municipal Code of Chicago § 18-28-801.18.1 Size.

18-28-801.18.1 Size. The chimney or vent shall be resized as necessary to control flue gas condensation in the interior of the chimney or vent and to provide the appliance or appliances served with the required draft. For venting of oil-fired appliances to masonry chimneys, the resizing shall be in accordance with NFPA 31.

Municipal Code of Chicago § 18-28-801.18.2 Flue passageways.

18-28-801.18.2 Flue passageways. The flue gas passageways shall be free of obstructions and combustible deposits and shall be cleaned if previously used for venting a solid or liquid fuel-burning appliance or fireplace. The flue liner, chimney inner wall or vent inner wall shall be continuous and shall be free of cracks, gaps, perforations or other damage or deterioration which would allow the escape of combustion products, including gases, moisture and creosote. Where an oil-fired appliance is connected to an existing masonry chimney, such chimney flue shall be repaired or relined in accordance with NFPA 31.

Municipal Code of Chicago § 18-28-801.18.4 Clearances.

18-28-801.18.4 Clearances. Chimneys and vents shall have airspace clearance to combustibles in accordance with the Chicago Building Code and the chimney or vent manufacturer's installation instructions. Exception: Masonry chimneys equipped with a chimney lining system tested and listed for installation in chimneys in contact with combustibles in accordance with UL 1777, and installed in accordance with the manufacturer's instructions, shall not be required to have clearance between combustible materials and exterior surfaces of the masonry chimney. Noncombustible fireblocking shall be provided in accordance with the Chicago Building Code. (Amend Coun. J. 9-14-21, p. 35949, Art. VIII, § 1)

Municipal Code of Chicago § 18-28-801.19 Multistory prohibited.

18-28-801.19 Multistory prohibited. Common venting systems for appliances located on more than one floor level shall be prohibited, except if all of the appliances served by the common vent are located in rooms or spaces that are accessed only from the outdoors. The appliance enclosures shall not communicate with the occupiable areas of the building.

Municipal Code of Chicago § 18-28-802.2 Vent application.

18-28-802.2 Vent application. The application of vents shall be in accordance with Table 18-28-802.2. Table 18-28-802.2 Vent Applications Vent Types | Appliance Types Type L oil vents | Oil-burning appliances listed and labeled for venting with Type L vents; gas appliances listed and labeled for venting with Type B vents. Pellet vents | Pellet fuel-burning appliances listed and labeled for venting with pellet vents.

Municipal Code of Chicago § 18-28-802.3 Installation.

18-28-802.3 Installation. Vent systems shall be sized, installed and terminated in accordance with the vent and appliance manufacturer's installation instructions.

Municipal Code of Chicago § 18-28-802.4 Vent termination caps required.

18-28-802.4 Vent termination caps required. Type L vents shall terminate with a listed and labeled cap in accordance with the vent manufacturer's installation instructions.

Municipal Code of Chicago § 18-28-802.5 Type L vent terminations.

18-28-802.5 Type L vent terminations. Type L vents shall terminate not less than 2 feet (610 mm) above the highest point of the roof penetration and not less than 2 feet (610 mm) higher than any portion of a building within 10 feet (3048 mm).

Municipal Code of Chicago § 18-28-802.6 Minimum vent heights.

18-28-802.6 Minimum vent heights. Vents shall terminate not less than 5 feet (1524 mm) in vertical height above the highest connected appliance draft hood outlet or flue collar. Exceptions: 1. Venting systems of direct vent appliances shall be installed in accordance with the appliance and the vent manufacturer' s instructions. 2. Appliances listed for outdoor installations incorporating venting means shall be installed in accordance with their listings and the manufacturer's installation instructions. 3. Pellet vents shall be installed in accordance with the appliance and the vent manufacturer's installation instruction.

Municipal Code of Chicago § 18-28-802.8 Installation shield.

18-28-802.8 Installation shield. Where vents pass through insulated assemblies, an insulation shield constructed of not less than 26 gauge sheet metal shall be installed to provide clearance between the vent and the insulation material. The clearance shall be not less than the clearance to combustibles specified by the vent manufacturer's installation instructions. Where vents pass through attic space, the shield shall terminate not less than 2 inches (51 mm) above the insulation materials and shall be secured in place to prevent displacement. Insulation shields provided as part of a listed vent system shall be installed in accordance with the manufacturer's installation instructions.

Municipal Code of Chicago § 18-28-803.1 Connectors required.

18-28-803.1 Connectors required. Connectors shall be used to connect appliances to the vertical chimney or vent, except where the chimney or vent is attached directly to the appliance.

Municipal Code of Chicago § 18-28-803.2 Location.

18-28-803.2 Location. Connectors shall be located entirely within the room in which the connecting appliance is located, except as provided in Section 18-28-803.10.4. Where passing through an unheated space, a connector serving a gas appliance shall not be constructed of single-wall pipe.

Municipal Code of Chicago § 18-28-803.3 Size.

18-28-803.3 Size. The connect shall not be smaller than the size of the flue collar or the size of the outlet of the draft hood supplied by the manufacturer of the appliance except as provided in Section 18-28-804. Where the appliance has more than one flue outlet, and in the absence of the manufacturer's specific instructions, the connector area shall be not less than the combined area of the flue outlets for which it acts as a common connector.

Municipal Code of Chicago § 18-28-803.4 Branch connectors.

18-28-803.4 Branch connectors. All branch connectors to the vent connector shall be made in accordance with the vent manufacturer's instructions.

Municipal Code of Chicago § 18-28-803.5 Manual dampers.

18-28-803.5 Manual dampers. Manual dampers shall not be installed in connectors except in chimney connectors serving solid fuel-burning appliances.

Municipal Code of Chicago § 18-28-803.6 Automatic dampers.

18-28-803.6 Automatic dampers. Automatic dampers shall be listed and labeled in accordance with UL 17 for oil-fired heating appliances. The dampers shall be installed in accordance with the manufacturer's installation instructions. An automatic vent damper device shall not be installed on an existing appliance installation unless the appliance is listed and labeled and equipped with a draft hood, and the device is installed in accordance with the terms of its listing. The name of the installer and date of installation shall be marked on a label affixed to the damper device.

Municipal Code of Chicago § 18-28-803.7 Connectors serving two or more appliances.

18-28-803.7 Connectors serving two or more appliances. Where two or more connectors enter a common gas vent or chimney, the smaller connector shall enter at the highest level consistent with available headroom or clearance to combustible material.

Municipal Code of Chicago § 18-28-803.8 Vent connector construction.

18-28-803.8 Vent connector construction. Vent connectors shall be constructed of metal. The minimum nominal thickness of the connector shall be 0.019 inch (0.5 mm) (No. 28 Gauge) for galvanized steel, 0.022 inch (0.6 mm) (No. 26 B&S Gauge) for copper and 0.020 inch (0.5 mm) (No. 24 B&S Gauge) for aluminum.

Municipal Code of Chicago § 18-28-803.9 Chimney connector construction.

18-28-803.9 Chimney connector construction. Chimney connectors for low-heat appliances shall be made of sheet steel pipe that is resistant to corrosion and heat not less than that required for galvanized steel as specified in Table 18-28-803.9(1). Connectors for medium-heat appliances and high-heat appliances shall be of sheet steel not less than the thickness specified in Table 18-28-803.9(2). Table 18-28-803.9(1) Minimum Chimney Connector Thickness for Low- Heat Appliances Diameter of Connector (inches) | Minimum Nominal Thickness (Galvanized) (inches) 5 and smaller | 0.022 (No. 26 Gauge) Larger than 5 and up to 10 | 0.028 (No. 24 Gauge) Larger than 10 and up to 16 | 0.034 (No. 22 Gauge) Larger than 16 | 0.064 (No. 16 Gauge) For SI: 1 inch = 25.4 mm, 1 square inch = 645.16 mm 2 . Table 18-28-803.9(2) Minimum Chimney Connector Thickness for Medium- and High-Heat Appliances Area (square inches) | Equivalent Round Diameter (inches) | Minimum Nominal Thickness (inches) 0 – 154 | 0 – 14 | 0.060 (No. 16 Gauge) 155 – 201 | 15 – 16 | 0.075 (No. 14 Gauge) 202 – 254 | 17 – 18 | 0.105 (No. 12 Gauge) Greater than 254 | Greater than 18 | 0.135 (No. 10 Gauge) For SI: 1 inch = 25.4 mm, 1 square inch = 645.16 mm 2 .

Municipal Code of Chicago § 18-28-803.10.1 Supports and joints.

18-28-803.10.1 Supports and joints. Connectors shall be supported in an approved manner, and joints shall be fastened with sheet metal screws, rivets or other approved means.

Municipal Code of Chicago § 18-28-803.10.3 Connection.

18-28-803.10.3 Connection. The connector shall extend to the inner face of the chimney or vent liner but not beyond. A connector entering a masonry chimney shall be cemented to masonry in an approved manner. If thimbles are installed to facilitate removal of the connector from the masonry chimney, the thimble shall be permanently cemented in place with high-temperature cement.

Municipal Code of Chicago § 18-28-803.10.4 Connector pass-through.

18-28-803.10.4 Connector pass-through. Chimney connectors shall not pass through any floor or ceiling, nor through a fire-resistance-rated wall assembly. Chimney connectors for domestic-type appliances shall not pass through walls or partitions constructed of combustible material to reach a masonry chimney unless: 1. The connector is labeled for wall pass-through and is installed in accordance with the manufacturer's instructions; or 2. The connector is put through a device labeled for wall pass-through; or 3. The connector has a diameter not larger than 10 inches (254 mm) and is installed in accordance with one of the methods identified in Table 18-28-803.10.4. Concealed metal parts of the pass-through system in contact with flue gases shall be made of stainless steel or equivalent material that resists corrosion, softening or cracking up to 1,800°F (980°C). Table 18-28-803.10.4 Chimney Connector Systems and Clearances to Combustible Wall Materials for Domestic Heating Appliances a, b, c, d System A (12-inch clearance) | A 3 1/2-inch-thick brick wall shall be framed into the combustible wall. A 5/8-inch-thick fire-clay liner (ASTM C 315 or equivalent) c shall be firmly cemented in the center of the brick wall maintaining a 12-inch clearance to combustibles. The clay liner shall run from the outer surface of the bricks to the inner surface of the chimney liner. System B (9-inch clearance) | A labeled solid-insulated factory-built chimney section (1-inch insulation) the same inside diameter as the connector shall be utilized. Sheet metal supports cut to maintain a 9-inch clearance to combustibles shall be fastened to the wall surface and to the chimney section. Fasteners shall not penetrate the chimney flue liner. The chimney length shall be flush with the masonry chimney liner and sealed to the masonry with water-insoluble refractory cement. Chimney manufacturer's parts shall be utilized to fasten securely the chimney connector to the chimney section. System C (6-inch clearance) | A sheet metal (minimum No. 24 Gauge) ventilated thimble having two 2-inch air channels shall be installed with a sheet steel chimney connector (minimum No. 24 Gauge). Sheet steel supports (minimum No 24 Gauge) shall be cut to maintain a 6-inch clearance between the thimble and combustibles. One side of the support shall be fastened to the wall on all sides. Glass-fiber insulation shall fill the 6-inch space between the thimble and the supports. System D (2-inch clearance) | A labeled solid-insulated factory-built chimney section (1-inch insulation) with a diameter 2 inches larger than the chimney connector shall be installed with a sheet steel chimney connector (minimum No. 24 Gauge). Sheet metal supports shall be positioned to maintained a 2-inch clearance to combustibles and to hold the chimney connector to ensure that a 1-inch airspace surrounds the chimney connector through the chimney section. The steel support shall be fastened to the wall on all sides and the chimney shall not penetrate the liner of the chimney section. For SI: 1 inch = 25.4 mm. a Insulation material that is part of the wall pass-through system shall be non-combustible and have a thermal conductivity of 1.0 Btu x in/ft 2 x h x °F or less. b All clearances and thicknesses are minimums. c Materials utilized to seat penetrations for the connector shall be noncombustible. d Connectors for all systems except System B shall extend through the wall pass-through system to the inner face of the flue liner. ASTM C 315.

Municipal Code of Chicago § 18-28-803.10.5 Pitch.

18-28-803.10.5 Pitch. Connectors shall rise vertically to the chimney or vent with a minimum pitch equal to one-fourth unit vertical in 12 units horizontal (2-percent slope).

Municipal Code of Chicago § 18-28-803.10.6 Clearances.

18-28-803.10.6 Clearances. Connectors shall have a minimum clearance to combustibles in accordance with Table 18-28-803.10.6. The clearances specified in Table 18-28-803.10.6 apply, except where the listing and labeling of an appliance specifies a different clearances, in which case the labeled clearance shall apply. The clearance to combustibles for connectors shall be reduced only in accordance with Section 18-28-308. Table 18-28-803.10.6 Connector Clearances to Combustibles Type of Appliance | Minimum Clearance (Inches) Type of Appliance | Minimum Clearance (Inches) Domestic-type appliances Chimney and vent connectors | Electric and oil incinerators | 18 Oil and solid fuel appliances | 18 Oil appliances labeled for venting with Type L vents | 9 Commercial, industrial-type appliances Low-heat appliances Chimney connectors | Oil and solid fuel boilers, furnaces and water heaters | 18 Oil unit heaters | 18 Other low-heat industrial appliances | 18 Medium-heat appliances Chimney connectors | All gas, oil and solid fuel appliances | 36 High-heat appliances Masonry or metal connectors | All gas, oil and solid fuel appliances | (As determined by the Building Commissioner) For SI: 1 inch = 25.4 mm. (Amend Coun. J. 9-14-21, p. 35949, Art. VIII, § 2)

Municipal Code of Chicago § 18-28-804.1 Direct-vent terminations.

18-28-804.1 Direct-vent terminations. Vent terminals for direct-vent appliances shall be installed in accordance with the manufacturer's installation instructions.

Municipal Code of Chicago § 18-28-804.2 Appliances with integral vents.

18-28-804.2 Appliances with integral vents. Appliances incorporating integral venting means shall be installed in accordance with their listings and the manufacturer' s installation instructions.

Municipal Code of Chicago § 18-28-804.2.1 Terminal clearances.

18-28-804.2.1 Terminal clearances. Appliances designed for natural draft venting and incorporating integral venting means shall be located so that a minimum clearance of 9 inches (229 mm) is maintained between vent terminals and from any openings through which combustion products enter the building. Appliances using forced draft venting shall be located so that a minimum clearance of 12 inches (305 mm) is maintained between vent terminals and from any openings through which combustion products enter the building.

Municipal Code of Chicago § 18-28-804.3 Mechanical draft systems.

18-28-804.3 Mechanical draft systems. Mechanical draft systems of either forced or induced draft design shall comply with Sections 18-28-804.3.1 through 18-28-804.3.7.

Municipal Code of Chicago § 18-28-804.3.1 Forced draft systems.

18-28-804.3.1 Forced draft systems. Forced draft systems and all portions of induced draft systems under positive pressure during operation shall be designed and installed so as to be gas tight to prevent leakage of combustion products into a building.

Municipal Code of Chicago § 18-28-804.3.2 Automatic shutoff.

18-28-804.3.2 Automatic shutoff. Power exhausters shall be electrically connected to each appliance to prevent operation of the appliance when the power exhauster is not in operation.

Municipal Code of Chicago § 18-28-804.3.3 Termination.

18-28-804.3.3 Termination. The termination of chimneys or vents equipped with power exhausters shall be located a minimum of 10 feet (3048 mm) from the lot line or from adjacent buildings. The exhaust shall be directed away from the building.

Municipal Code of Chicago § 18-28-804.3.4 Horizontal terminations.

18-28-804.3.4 Horizontal terminations. Horizontal terminations shall comply with the following requirements: 1. Where located adjacent to walkways, the termination of mechanical draft systems shall be not less than 7 feet (2134 mm) above the level of the walkway. 2. Vents shall terminate at least 3 feet (914 mm) above any forced air inlet located within 10 feet (3048 mm). 3. The vent system shall terminate at least 4 feet (1219 mm) below, 4 feet (1219 mm) horizontally from or 1 foot (305 mm) above any door, window or gravity air inlet into the building. 4. The vent termination point shall not be located closer than 3 feet (914 mm) to an interior corner formed by two walls perpendicular to each other. 5. Vent termination shall not be mounted directly above or within 3 feet (914 mm) horizontally from an oil tank vent or gas meter. 6. The bottom of the vent termination shall be located at least 12 inches (305 mm) above finished grade.

Municipal Code of Chicago § 18-28-804.3.5 Vertical terminations.

18-28-804.3.5 Vertical terminations. Vertical terminations shall comply with the following requirements: 1. Where located adjacent to walkways, the termination of mechanical draft systems shall be not less than 7 feet (2134 mm) above the level of the walkway. 2. Vents shall terminate at least 3 feet (914 mm) above any forced air inlet located within 10 feet (3048 mm). 3. Where the vent termination is located below an adjacent roof structure, the termination point shall be located at least 3 feet (914 mm) from such structure. 4. The vent shall terminate at least 4 feet (1219 mm) below, 4 feet (1219 mm) horizontally from, or 1 foot (305 mm) above any door, window or gravity air inlet for the building. 5. A vent cap shall be installed to prevent rain from entering the vent system. 6. The vent termination shall be located at least 3 feet (914 mm) horizontally from any portion of the roof structure.

Municipal Code of Chicago § 18-28-804.3.6 Exhauster connections.

18-28-804.3.6 Exhauster connections. An appliance vented by natural draft shall not be connected into a vent, chimney or vent connector on the discharge side of a mechanical flue exhauster.

Municipal Code of Chicago § 18-28-804.3.7 Exhauster sizing.

18-28-804.3.7 Exhauster sizing. Mechanical flue exhausters and the vent system served shall be sized and installed in accordance with the manufacturer's installation instructions.

Municipal Code of Chicago § 18-28-805.1 Listing.

18-28-805.1 Listing. Factory-built chimneys shall be listed and labeled and shall be installed and terminated in accordance with the manufacturer's installation instructions.

Municipal Code of Chicago § 18-28-805.2 Solid fuel appliances.

18-28-805.2 Solid fuel appliances. Factory-built chimneys for use with solid fuel- burning appliances shall comply with the Type HT requirements of UL 103. Exception: Chimneys for use with fireplace stoves listed only to UL 737 shall comply with the requirements of UL 103.

Municipal Code of Chicago § 18-28-805.4 Support.

18-28-805.4 Support. Where factory-built chimneys are supported by structural members, such as joists and rafters, such members shall be designed to support the additional load.

Municipal Code of Chicago § 18-28-805.5 Medium-heat appliances.

18-28-805.5 Medium-heat appliances. Factory-built chimneys for medium-heat appliances producing flue gases having a temperature above 1,000°F(538°C), measured at the entrance to the chimney, shall comply with UL 959.

Municipal Code of Chicago § 18-28-805.6 Decorative shrouds.

18-28-805.6 Decorative shrouds. Decorative shrouds shall not be installed at the termination of factory-built chimneys except where such shrouds are listed and labeled for use with the specific factory-built chimney system and are installed in accordance with the provisions of this Chapter 18-28. (Amend Coun. J. 11-9-16, p. 36266, § 36)

Municipal Code of Chicago § 18-28-807.1.5 .

18-28-807.1.5. Where necessary, engine generator exhaust systems shall have one or more flexible connectors to minimize the possibility of a leak in the engine exhaust system because of engine vibration or thermal expansion.

Municipal Code of Chicago § 18-28-807.2 Exhaust systems termination.

18-28-807.2 Exhaust systems termination. The exit terminal of an engine generator exhaust system shall be located as follows: 1. Not less than 15 feet above any forced air inlet or operable window located within 20 feet horizontally on the same or adjacent buildings. 2. Not less than 10 feet from an adjacent building and not less than 8 feet above grade where located adjacent to a public walkway. 3. The exit terminal shall be so arranged that flue gases are not directed to buildings within 20 feet and are directed so as not to jeopardize people. 4. Through-the-wall engine exhaust systems shall not terminate in an area where condensate, vapor, or odor could create a nuisance or hazard. 5. Where necessary, exhaust systems shall be shielded to prevent personnel burns.
Source: City of Chicago, Municipal Code of Chicago (American Legal Publishing, codelibrary.amlegal.com)URL: https://codelibrary.amlegal.com/codes/chicago/latest/chicago_il/0-0-0-2687761Fetched: 10/24/2026

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