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Exhaust fans.

Municipal Code of Chicago § 18-28-506.3.1
in effect
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18-28-506.3.1 Exhaust fans. Exhaust fan housings serving a Type I hood shall be constructed of steel. Exception: Fans listed and labeled as power roof ventilators for restaurant cooking appliances.
Source: City of Chicago, Municipal Code of Chicago (American Legal Publishing, codelibrary.amlegal.com)URL: https://codelibrary.amlegal.com/codes/chicago/latest/chicago_il/0-0-0-2687270Fetched: 10/24/2026

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18-28-506.3.1 | Corpus