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Supply and return ducts.

Municipal Code of Chicago § 18-28-1104.4.5
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18-28-1104.4.5 Supply and return ducts. The volume of the supply and return ducts and plenums shall be included when calculating the refrigerant quantity limit in the system.
Source: City of Chicago, Municipal Code of Chicago (American Legal Publishing, codelibrary.amlegal.com)URL: https://codelibrary.amlegal.com/codes/chicago/latest/chicago_il/0-0-0-2688828Fetched: 10/24/2026

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18-28-1104.4.5 | Corpus