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Return air risers.

Municipal Code of Chicago § 18-28-606.2.3
in effect
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18-28-606.2.3 Return air risers. Where return air risers serve two or more stories and are part of a return air system having a design capacity greater than 15,000 cfm (7.1 m 3 /s), smoke detectors shall be installed at each story. Such smoke detectors shall be located upstream of the connection between the return air riser and any air ducts or plenums.
Source: City of Chicago, Municipal Code of Chicago (American Legal Publishing, codelibrary.amlegal.com)URL: https://codelibrary.amlegal.com/codes/chicago/latest/chicago_il/0-0-0-2687661Fetched: 10/24/2026

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18-28-606.2.3 | Corpus