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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
18-28-401.6 Outdoor air opening and protection.
   Air intake and exhaust that terminate outdoors shall be suitably protected against Chicago weather conditions, with corrosion resistant screens, louvers and grilles. Area of the outside air intake shall be sized so that at least 100 percent of the code-required outside air as required in Section 18-28-403.1 can be taken from outside at velocities not in excess of 1,000 feet per minute (304.8 mpm) through free area except for systems defined in paragraph 18-28-403.1.3.
Table 18-28-401.6
Opening Sizes in Louvers Grilles and Screens Protecting Outdoor Exhaust and Air Intake Openings
 
Outdoor Opening Type
Minimum and Maximum Opening Sizes in Louvers, Grilles and Screens Measured in Any Direction
Exhaust openings
Not less than 1/4 inch and not greater than 1/2 inch
Intake openings in residential occupancies
Not less than 1/4 inch and not greater than 1/2 inch
Intake openings in other than residential occupancies
Not less than 1/4 inch and not greater than 1 inch
 
For SI: 1 inch = 25.4 mm.

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