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Long mains.

Municipal Code of Chicago § 18-29-912.2.3
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18-29-912.2.3 Long mains. Long mains shall be provided with additional relief vents located at intervals of every 100 feet (30.48 m).
Source: City of Chicago, Municipal Code of Chicago (American Legal Publishing, codelibrary.amlegal.com)URL: https://codelibrary.amlegal.com/codes/chicago/latest/chicago_il/0-0-0-2692518Fetched: 10/24/2026

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18-29-912.2.3 | Corpus