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Recirculated air.

Municipal Code of Chicago § 18-28-514.4
in effect
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18-28-514.4 Recirculated air. Air conveyed within energy recovery ventilation systems shall not be considered as recirculated air where the energy recovery ventilation system is constructed to limit cross-leakage between air streams to less than 10 percent of the total airflow design capacity. (Added Coun. J. 9-14-21, p. 35949, Art. V, § 27)
Source: City of Chicago, Municipal Code of Chicago (American Legal Publishing, codelibrary.amlegal.com)URL: https://codelibrary.amlegal.com/codes/chicago/latest/chicago_il/0-0-0-2694768Fetched: 10/24/2026

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18-28-514.4 | Corpus