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Internal insulation.

Municipal Code of Chicago § 18-28-604.13
in effect
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18-28-604.13 Internal insulation. Materials used in ducts as internal insulation and exposed to the airstream shall be durable when tested in accordance with UL 181.
Source: City of Chicago, Municipal Code of Chicago (American Legal Publishing, codelibrary.amlegal.com)URL: https://codelibrary.amlegal.com/codes/chicago/latest/chicago_il/0-0-0-2687641Fetched: 10/24/2026

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18-28-604.13 | Corpus