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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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18-28-502.15.1  Design.
   Indoor locations shall be ventilated utilizing air supply inlets and exhaust outlets arranged to provide uniform air movement to the extent practical. Inlets shall be uniformly arranged on exterior walls near floor level. Outlets shall be located at the high point of the room in exterior walls or the roof.
   1.   Ventilation shall be by a continuous mechanical ventilation system or by a mechanical ventilation system activated by a continuously monitoring natural gas detection system activating at a gas concentration of 20 percent of the LFL or higher. In all cases, the system shall shut down the fueling system in the event of failure of the ventilation system.
   2.   The ventilation rate shall be at least 1 cubic foot per minute per 12 cubic feet [0.00138m 3 /(s x m 3 )] of room volume.
18-28-502.15.2  Operation.
   The mechanical ventilation system shall operate continuously.
   Exceptions:
      1.   Mechanical ventilation systems that are interlocked with a gas detection system designed in accordance with the Chicago Fire Code.
      2.   Mechanical ventilation systems in garages that are used only for the repair of vehicles fueled by liquid fuels or odorized gases, such as CNG, where the ventilation system is electrically interlocked with the lighting circuit.
18-28-502.16  Tire rebuilding or recapping.
   Each room where rubber cement is used or mixed, or where flammable or combustible solvents are applied, shall be ventilated in accordance with the applicable provisions of NFPA 91.
18-28-502.16.1  Buffing machines.
   Each buffing machine shall be connected to a dust-collecting system that prevents the accumulation of the dust produced by the buffing process.
18-28-502.17  Specific rooms.
   Specific rooms, including bathrooms, locker rooms, smoking lounges and toilet rooms, shall be exhausted in accordance with the ventilation requirements of Article 4, Ventilation.
18-28-503  Motors and Fans.
18-28-503.1  General.
   Motors and fans shall be sized to provide the required air movement. Motors in areas that contain flammable vapors or dusts shall be of a type approved for such environments. A manually operated emergency shut off shall be installed at exits from the room or space containing flammable vapor or dust. Electrical equipment and appliances used in operations that generate explosive or flammable vapors, fumes or dusts shall be interlocked with the ventilation system so that the equipment and appliances cannot be operated unless the ventilation fans are in operation. Motors for fans used to convey flammable vapors or dusts shall be located outside the duct or shall be protected with approved shields and dust proofing. Motors and fans shall be provided with a means of access for servicing and maintenance.
18-28-503.2  Fans.
   Parts of fans in contact with explosive or flammable vapors, fumes or dusts shall be of nonferrous or nonsparking materials, or their casing shall be lined or constructed of such material. When the size and hardness of materials passing through a fan are capable of producing a spark, both the fan and the casing shall be of nonsparking materials. When fans are required to be spark resistant, their bearings shall not be within the airstream, and all parts of the fan shall be grounded. Fans in systems-handling materials that are capable of clogging the blades, and fans in buffing or woodworking exhaust systems, shall be of the radial-blade or tube-axial type.
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