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Clearances.

Municipal Code of Chicago § 18-28-506.3.7
in effect
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18-28-506.3.7 Clearances. Grease duct systems serving a Type I hood shall have a clearance to combustible construction of not less than 18 inches (457 mm). Exception: Listed and labeled factory-built commercial kitchen grease ducts installed in accordance with the Chicago Fire Prevention Code. (Amend Coun. J. 9-14-21, p. 35949, Art. V, § 13)
Source: City of Chicago, Municipal Code of Chicago (American Legal Publishing, codelibrary.amlegal.com)URL: https://codelibrary.amlegal.com/codes/chicago/latest/chicago_il/0-0-0-2687306Fetched: 10/24/2026

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