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Form a Business

Material and size.

Municipal Code of Chicago § 18-28-504.9.1
in effect
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18-28-504.9.1 Material and size. Exhaust ducts shall have a smooth interior finish and shall be constructed of metal not less than 0.016 inch (0.4 mm) in thickness. The exhaust duct size shall be 4 inches (102 mm) nominal in diameter. (Amend Coun. J. 9-14-21, p. 35949, Art. V, § 11)
Source: City of Chicago, Municipal Code of Chicago (American Legal Publishing, codelibrary.amlegal.com)URL: https://codelibrary.amlegal.com/codes/chicago/latest/chicago_il/0-0-0-2694662Fetched: 10/24/2026

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18-28-504.9.1 | Corpus