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Weatherproof barriers.

Municipal Code of Chicago § 18-28-604.12
in effect
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18-28-604.12 Weatherproof barriers. Insulated exterior ducts shall be protected with an approved weatherproof barrier.
Source: City of Chicago, Municipal Code of Chicago (American Legal Publishing, codelibrary.amlegal.com)URL: https://codelibrary.amlegal.com/codes/chicago/latest/chicago_il/0-0-0-2687639Fetched: 10/24/2026

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18-28-604.12 | Corpus