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Makeup air required.

Municipal Code of Chicago § 18-28-505.4
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18-28-505.4 Makeup air required. Exhaust hoods capable of exhausting in excess of 400 cfm (0.19 m 3 /s) shall be provided with mechanical makeup air at a rate approximately equal to the exhaust air rate. Such makeup air systems shall be equipped with a means of closure and shall be automatically controlled to start and operate simultaneously with the exhaust system. (Amend Coun. J. 9-14-21, p. 35949, Art. V, § 12)
Source: City of Chicago, Municipal Code of Chicago (American Legal Publishing, codelibrary.amlegal.com)URL: https://codelibrary.amlegal.com/codes/chicago/latest/chicago_il/0-0-0-2694691Fetched: 10/24/2026

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18-28-505.4 | Corpus