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Rooms used as a plenum.

Municipal Code of Chicago § 18-29-502.3
in effect
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18-29-502.3 Rooms used as a plenum. Water heaters using solid, liquid or gas fuel shall not be installed in a room containing air-handling machinery when such room is used as a plenum.
Source: City of Chicago, Municipal Code of Chicago (American Legal Publishing, codelibrary.amlegal.com)URL: https://codelibrary.amlegal.com/codes/chicago/latest/chicago_il/0-0-0-2691295Fetched: 10/24/2026

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18-29-502.3 | Corpus