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Municipal Code of Chicago
MUNICIPAL CODE OF CHICAGO
TITLE 1 GENERAL PROVISIONS
TITLE 2 CITY GOVERNMENT AND ADMINISTRATION
TITLE 3 REVENUE AND FINANCE
TITLE 4 BUSINESSES, OCCUPATIONS AND CONSUMER PROTECTION
TITLE 5 HOUSING AND ECONOMIC DEVELOPMENT
TITLE 6 HUMAN RIGHTS*
TITLE 7 HEALTH AND SAFETY
TITLE 8 OFFENSES AFFECTING PUBLIC PEACE, MORALS AND WELFARE
TITLE 9 VEHICLES, TRAFFIC AND RAIL TRANSPORTATION
TITLE 10 STREETS, PUBLIC WAYS, PARKS, AIRPORTS AND HARBORS
TITLE 11 UTILITIES AND ENVIRONMENTAL PROTECTION
TITLE 12 RESERVED
TITLE 13 BUILDINGS AND CONSTRUCTION
TITLE 14 RESERVED*
TITLE 14A ADMINISTRATIVE PROVISIONS OF THE CHICAGO CONSTRUCTION CODES*
TITLE 14B BUILDING CODE*
TITLE 14C CONVEYANCE DEVICE CODE*
TITLE 14E ELECTRICAL CODE*
TITLE 14F FIRE PREVENTION CODE*
TITLE 14G FUEL GAS CODE*
TITLE 14M MECHANICAL CODE*
TITLE 14N 2022 ENERGY TRANSFORMATION CODE*
TITLE 14P PLUMBING CODE*
TITLE 14R BUILDING REHABILITATION CODE*
TITLE 14X MINIMUM REQUIREMENTS FOR EXISTING BUILDINGS*
TITLE 15 FIRE PREVENTION
TITLE 16 LAND USE
TITLE 17 CHICAGO ZONING ORDINANCE
TITLE 18 BUILDING INFRASTRUCTURE
APPENDIX TO THE MUNICIPAL CODE OF CHICAGO (RESERVED)*
TABLES
Chicago Zoning Ordinance and Land Use Ordinance
CHICAGO ZONING ORDINANCE AND LAND USE ORDINANCE
TITLE 16 LAND USE
TITLE 17 CHICAGO ZONING ORDINANCE
18-28-603.3 Metallic ducts.
   All ducts shall be constructed of iron, steel, aluminum or other approved material. Ducts shall be constructed as specified in the SMACNA HVAC Duct Construction Standards – Metal and Flexible.
   Exception: Ducts installed within single dwelling units shall have a minimum thickness as specified in Table 18-28-603.3.
Table 18-28-603.3
Duct Construction: Minimum Sheetmetal Thicknesses for Single Dwelling Units
Duct Size
Galvanized Steel
Approximate Aluminum B&S Gauge
Minimum thickness (inches)
Equivalent galvanized Gauge No.
Duct Size
Galvanized Steel
Approximate Aluminum B&S Gauge
Minimum thickness (inches)
Equivalent galvanized Gauge No.
Round ducts and enclosed rectangular ducts
   14" or less
0.013
30
26
   Over 14"
0.016
28
24
Exposed rectangular ducts
   14" or less
0.016
28
24
   Over 14"
0.019
26
22
 
For SI: 1 inch = 25.4 mm

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