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Underground ducts.

Municipal Code of Chicago § 18-28-603.7
in effect
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18-28-603.7 Underground ducts. Ducts shall be approved for underground installation. Metallic ducts not having an approved protective coating shall be completely encased in a minimum of 2 inches (51 mm) of concrete.
Source: City of Chicago, Municipal Code of Chicago (American Legal Publishing, codelibrary.amlegal.com)URL: https://codelibrary.amlegal.com/codes/chicago/latest/chicago_il/0-0-0-2687593Fetched: 10/24/2026

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18-28-603.7 | Corpus