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Prior Chicago Building Code
BUILDING CODE AND RELATED EXCERPTS OF THE MUNICIPAL CODE OF CHICAGO
DIVISION 1 - ADMINISTRATION
DIVISION 2 - DEFINITIONS
DIVISION 3 - USE AND OCCUPANCY CLASSIFICATIONS
DIVISION 4 - SPECIAL DETAILED REQUIREMENTS BASED ON USE AND OCCUPANCY
DIVISION 5 - GENERAL BUILDING HEIGHTS AND AREAS
DIVISION 6 - TYPES OF CONSTRUCTION
DIVISION 7 - FIRE-RESISTANCE-RATED CONSTRUCTION
DIVISION 8 - INTERIOR FINISHES (NA)
DIVISION 9 - FIRE PROTECTION SYSTEMS
DIVISION 10 - MEANS OF EGRESS
DIVISION 11 - ACCESSIBILITY
DIVISION 12 - INTERIOR ENVIRONMENT
DIVISION 13 - ENERGY EFFICIENCY AND ENVIRONMENTAL PROTECTION
DIVISION 14 - EXTERIOR WALLS (NA)
DIVISION 15 - ROOF ASSEMBLIES AND ROOFTOP STRUCTURES (NA)
DIVISION 16 - STRUCTURAL DESIGN
DIVISION 17 - STRUCTURAL TESTS AND SPECIAL INSPECTIONS
DIVISION 18 - SOILS AND FOUNDATIONS
DIVISION 19 - CONCRETE
DIVISION 20 - ALUMINUM (NA)
DIVISION 21 - MASONRY
DIVISION 22 - STEEL
DIVISION 23 - WOOD
DIVISION 24 - GLASS AND GLAZING (NA)
DIVISION 25 - GYPSUM BOARD AND PLASTER (NA)
DIVISION 26 - PLASTIC (NA)
DIVISION 27 - ELECTRICAL
DIVISION 28 - MECHANICAL SYSTEMS
CHAPTER 18-28 MECHANICAL SYSTEMS*
Article I. Administration (18-28-101 et seq.)
Article II. Definitions (18-28-201 et seq.)
Article III. General Regulations (18-28-301 et seq.)
Article IV. Ventilation (18-28-401 et seq.)
Article V. Exhaust Systems (18-28-501 et seq.)
18-28-501 General.
18-28-501.1 Scope.
18-28-501.2 Independent system required.
18-28-501.3 Outdoor discharge.
18-28-501.4 Pressure equalization.
18-28-501.5 Ducts.
18-28-502 Required Systems.
18-28-502.1 General.
18-28-502.1.1 Exhaust location.
18-28-502.1.2 Fuel-dispensing areas.
18-28-502.1.3 Equipment, appliance and service rooms.
18-28-502.1.4 Hazardous exhaust.
18-28-502.2 Aircraft fueling and defueling.
18-28-502.3 Battery-charging areas.
18-28-502.4 Stationary lead-acid battery systems.
18-28-502.4.1 Hydrogen limit.
18-28-502.4.2 Ventilation rate.
18-28-502.5 Dry cleaning plants.
18-28-502.5.1 Type II systems.
18-28-502.5.2 Type IV and V systems.
18-28-502.5.3 Spotting and pretreating.
18-28-502.6 Application of flammable finishes.
18-28-502.6.1 During construction.
18-28-502.6.2 Limited spraying spaces.
18-28-502.6.3 Spraying areas.
18-28-502.6.3.1 Operation.
18-28-502.6.3.2 Recirculation.
18-28-502.6.3.3 Air velocity.
18-28-502.6.3.4 Ventilation obstruction.
18-28-502.6.3.5 Independent ducts.
18-28-502.6.3.6 Termination point.
18-28-502.6.3.7 Fan motors and belts.
18-28-502.6.4 Dipping operations.
18-28-502.6.5 Electrostatic apparatus.
18-28-502.6.6 Powder coating.
18-28-502.6.7 Floor resurfacing operations.
18-28-502.7 Hazardous materials - general requirements.
18-28-502.7.1 Storage in excess of the maximum allowable quantities.
18-28-502.7.1.1 System requirements.
18-28-502.7.2 Gas rooms, exhausted enclosures and gas cabinets.
18-28-502.7.3 Indoor dispensing and use.
18-28-502.7.4 Indoor dispensing and use - point sources.
18-28-502.7.5 Closed systems.
18-28-502.8 Hazardous materials - requirements for specific materials.
18-28-502.8.1 Compressed gases - medical gas systems.
18-28-502.8.2 Corrosives.
18-28-502.8.3 Cryogenics.
18-28-502.8.4 Explosives.
18-28-502.8.5 Flammable and combustible liquids.
18-28-502.8.5.1 Vaults.
18-28-502.8.5.2 Storage rooms and warehouses.
18-28-502.8.5.3 Cleaning machines.
18-28-502.8.5.4 Use, dispensing and mixing.
18-28-502.8.5.5 Bulk plants or terminals.
18-28-502.8.5.5.1 General.
18-28-502.8.5.5.2 Basements and pits.
18-28-502.8.5.5.3 Dispensing of Class I liquids.
18-28-502.8.6 Highly toxic and toxic liquids.
18-28-502.8.6.1 Treatment system.
18-28-502.8.6.2 Open and closed systems.
18-28-502.8.7 High toxic and toxic compressed - any quantity.
18-28-502.8.7.1 Gas cabinets.
18-28-502.8.7.2 Exhausted enclosures.
18-28-502.8.8 Highly toxic and toxic compressed gases - quantities exceeding the maximum allowable per control area.
18-28-502.8.8.1 Ventilated areas.
18-28-502.8.8.2 Local exhaust for portable tanks.
18-28-502.8.8.3 Piping and controls - stationary tanks.
18-28-502.8.8.4 Gas rooms.
18-28-502.8.8.5 Treatment system.
18-28-502.8.8.6 Process equipment.
18-28-502.8.9 Ozone gas generators.
18-28-502.8.10 LP-gas distribution facilities.
18-28-502.8.10.1 Portable container use.
18-28-502.8.11 Silane gas.
18-28-502.9 Hazardous production materials (HPM).
18-28-502.9.1 Where required.
18-28-502.9.2 Penetrations.
18-28-502.9.3 Treatment systems.
18-28-502.10 Motion picture projectors.
18-28-502.10.1 Projectors with an exhaust discharge.
18-28-502.10.2 Projectors without exhaust connection.
18-28-502.11 Organic coating processes.
18-28-502.12 Public garages.
18-28-502.13 Motor vehicle operation.
18-28-502.14 Repair garages.
18-28-502.15 Repair garages for natural gas- and hydrogen-fueled vehicles.
18-28-502.15.1 Design.
18-28-502.15.2 Operation.
18-28-502.16 Tire rebuilding or recapping.
18-28-502.16.1 Buffing machines.
18-28-502.17 Specific rooms.
18-28-503 Motors and Fans.
18-28-503.1 General.
18-28-503.2 Fans.
18-28-503.3 Equipment and appliances identification plate.
18-28-503.4 Corrosion-resistant fans.
18-28-504 Clothes Dryer Exhaust.
18-28-504.1 Installation.
18-28-504.2 Exhaust penetrations.
18-28-504.3 Cleanout.
18-28-504.4 Exhaust installation.
18-28-504.5 Makeup air.
18-28-504.6 Domestic clothes dryer ducts.
18-28-504.6.1 Maximum length.
18-28-504.6.2 Rough-in required.
18-28-504.7 Commercial clothes dryers.
18-28-505 Domestic Kitchen Exhaust Equipment.
18-28-505.1 Domestic systems.
18-28-506 Commercial Kitchen Grease Ducts and Exhaust Equipment.
18-28-506.1 General.
18-28-506.2 Corrosion protection.
18-28-506.3 Ducts serving Type I hoods.
18-28-506.3.1 Exhaust fans.
18-28-506.3.1.1 Fan motor.
18-28-506.3.2 Grease duct materials.
18-28-506.3.3 Joints, seams and penetrations of grease ducts.
18-28-506.3.3.1 Duct joint types.
18-28-506.3.3.2 Duct-to-hood joints.
18-28-506.3.3.3 Duct-to-exhaust fan connections.
18-28-506.3.3.4 Vibration isolation.
18-28-506.3.4 Grease duct supports.
18-28-506.3.5 Air velocity.
18-28-506.3.6 Separation of grease duct system.
18-28-506.3.7 Clearances.
18-28-506.3.8 Prevention of grease accumulation.
18-28-506.3.9 Cleanouts and other openings.
18-28-506.3.9.1 Personnel entry.
18-28-506.3.10 Horizontal cleanouts.
18-28-506.3.11 Duct enclosure.
18-28-506.3.12 Fire-resistive access opening.
18-28-506.3.13 Type I exhaust outlets.
18-28-506.3.13.1 Termination above the roof.
18-28-506.3.13.2 Termination through an exterior wall.
18-28-506.3.13.3 Termination location.
18-28-506.4 Ducts serving Type II hoods.
18-28-506.4.1 Type II exhaust outlets.
18-28-506.4.2 Ducts.
18-28-507 Commercial Kitchen Hoods.
18-28-507.1 General.
18-28-507.2 Where required.
18-28-507.2.1 Type I and Type II hoods.
18-28-507.2.2 Domestic cooking appliances used for commercial purposes.
18-28-507.2.3 Solid fuel.
18-28-507.3 Fuel-burning appliances.
18-28-507.4 Type I materials.
18-28-507.5 Type II hood materials.
18-28-507.6 Supports.
18-28-507.7 Hood joints, seams and penetrations.
18-28-507.7.1 Type I hoods.
18-28-507.7.2 Type II hoods.
18-28-507.8 Cleaning and grease gutters.
18-28-507.9 Clearances for Type I hood.
18-28-507.10 Hoods penetrating a ceiling.
18-28-507.11 Grease filters.
18-28-507.11.1 Criteria.
18-28-507.11.2 Mounting position.
18-28-507.12 Canopy size and location.
18-28-507.13 Capacity of hoods.
18-28-507.13.1 Solid fuel-burning cooking appliances.
18-28-507.13.2 High temperature.
18-28-507.13.3 Medium temperature.
18-28-507.13.4 Low temperature.
18-28-507.14 Noncanopy size and location.
18-28-507.15 Capacity for noncanopy hoods.
18-28-507.16 Exhaust outlets.
18-28-507.17 Performance test.
18-28-508 Commercial Kitchen Makeup Air.
18-28-508.1 Makeup air.
18-28-508.1.1 Makeup air temperature.
18-28-508.2 Compensating hoods.
18-28-509 Fire Suppression Systems.
18-28-509.1 Where required.
18-28-510 Hazardous Exhaust Systems.
18-28-510.1 General.
18-28-510.2 Where required.
18-28-510.2.1 Lumber yards and woodworking facilities.
18-28-510.2.2 Combustible fibers.
18-28-510.3 Design and operation.
18-28-510.4 Independent system.
18-28-510.5 Design.
18-28-510.5.1 Balancing.
18-28-510.5.2 Emission control.
18-28-510.5.3 Hoods required.
18-28-510.5.4 Contaminant capture and dilution.
18-28-510.5.5 Makeup air.
18-28-510.5.6 Clearances.
18-28-510.5.7 Ducts.
18-28-510.6 Penetrations.
18-28-510.7 Suppression required.
18-28-510.8 Duct construction.
18-28-510.8.1 Duct joints.
18-28-510.8.2 Clearance to combustibles.
18-28-510.8.3 Explosion relief.
18-28-510.9 Supports.
18-28-511 Dust, Stock and Refuse Conveying Systems.
18-28-511.1 Dust, stock and refuse conveying systems.
18-28-511.1.1 Collectors and separators.
18-28-511.1.2 Discharge pipe.
18-28-511.1.3 Conveying system exhaust discharge.
18-28-511.1.4 Spark protection.
18-28-511.1.5 Explosion relief vents.
18-28-511.1.5.1 Screens.
18-28-511.1.5.2 Hoods.
18-28-511.2 Exhaust outlets.
18-28-512 Subslab Soil Exhaust Systems.
18-28-512.1 General.
18-28-512.2 Materials.
18-28-512.3 Grade.
18-28-512.4 Termination.
18-28-512.5 Identification.
18-28-513 Smoke Control Systems.
18-28-513.1
18-28-513.2 through 18-28-513.20.3 Deliberately omitted.
Article VI. Duct Systems (18-28-601 et seq.)
Article VII. Combustion Air (18-28-701 et seq.)
Article VIII. Chimneys and Vents (18-28-801 et seq.)
Article IX. Specific Appliances, Fireplaces and Solid Fuel-Burning Equipment (18-28-901 et seq.)
Article X. Boilers, Water Heaters and Pressure Vessels (18-28-1001 et seq.)
Article XI. Refrigeration (18-28-1101 et seq.)
Article XII. Hydronic Piping (18-28-1200 et seq.)
Article XIII. Fuel Oil Piping and Storage (18-28-1301 et seq.)
Article XIV. Fuel-Gas Piping (18-28-1401 et seq.)
Article XV. Solar Systems (18-28-1501 et seq.)
DIVISION 29 - PLUMBING SYSTEMS
DIVISION 30 - ELEVATORS AND CONVEYING SYSTEMS
DIVISION 31 - SPECIAL CONSTRUCTION (NA)
DIVISION 32 - ENCROACHMENTS INTO THE PUBLIC RIGHT-OF-WAY
DIVISION 33 - SAFEGUARDS DURING CONSTRUCTION
DIVISION 34 - EXISTING STRUCTURES
DIVISION 35 - REFERENCED STANDARDS

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18-28-504.1  Installation.
   Clothes dryers shall be exhausted in accordance with the manufacturer's instructions. Dryer exhaust systems shall be independent of all other systems and shall convey the moisture and any products of combustion to the outside of the building.
   Exception: Where the make and model of an electric dryer is known and the manufacturer's installation instructions do not require exhaust, see Article 4, Ventilation for room exhaust requirements.
18-28-504.2  Exhaust penetrations.
   Ducts that exhaust clothes dryers shall not penetrate or be located within any fireblocking, draftstopping or any wall, floor/ceiling or other assembly required by the Chicago Building Code to be fire-resistance rated, unless such duct is constructed of galvanized steel or aluminum of the thickness specified in Section 603.3, Metallic Ducts and the fire-resistance rating is maintained in accordance with the Chicago Building Code.
18-28-504.3  Cleanout.
   Each vertical riser shall be provided with a means for cleanout.
18-28-504.4  Exhaust installation.
   Dryer exhaust ducts for clothes dryers shall terminate on the outside of the building and shall be equipped with a backdraft damper. Screens shall not be installed at the duct termination. Ducts shall not be connected or installed with sheet metal screws or other fasteners that will obstruct the exhaust flow. Clothes dryer exhaust ducts shall not be connected to a gas vent connector, gas vent or chimney. Clothes dryer exhaust ducts shall not extend into or through ducts or plenums.
18-28-504.5  Makeup air.
   Installations exhausting more than 200 cfm (0.09 m 3 /s) shall be provided with makeup air. Where a closet is designed for the installation of a clothes dryer, an opening having an area of not less than 100 square inches (0.0645 m 2 ) shall be provided in the closet enclosure.
18-28-504.6  Domestic clothes dryer ducts.
   Exhaust ducts for domestic clothes dryers shall be constructed of metal and shall have a smooth interior finish. The exhaust duct shall be a minimum nominal size of 4 inches (102 mm) in diameter. The entire exhaust system shall be supported and secured in place. The male end of the duct at overlapped duct joints shall extend in the direction of air flow. Clothes dryer transition ducts used to connect the appliance to the exhaust duct system shall be limited to single lengths not to exceed 8 feet (2438 mm) and shall be listed and labeled for the application. Transition ducts shall not be concealed within construction.
18-28-504.6.1  Maximum length.
   The maximum length of a clothes dryer exhaust duct shall not exceed 25 feet (7620 mm) from the dryer location to the outlet terminal. The maximum length of the duct shall be reduced 2.5 feet (762 mm) for each 45-degree (0.79 rad) bend and 5 feet (1524 mm) for each 90-degree (1.6 rad) bend. The maximum length of the exhaust duct does not include the transition duct
   Exceptions:
      1.   Where the make and model of the clothes dryer to be installed is known and the manufacturer's installation instructions for such dryer are provided to the Building Commissioner, the maximum length of the exhaust duct may exceed 25 feet, including any transition duct, provided it is in accordance with the dryer manufacturer's installation instructions.
      2.   Where a central engineered exhaust dryer system is used.
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