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Makeup air temperature.

Municipal Code of Chicago § 18-28-508.1.1
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18-28-508.1.1 Makeup air temperature. The temperature differential between makeup air and the air in the conditioned space shall not exceed 10°F (6°C). Exceptions: 1. Makeup air that is part of the air-conditioning system. 2. Makeup air that does not decrease the comfort conditions of the occupied space.
Source: City of Chicago, Municipal Code of Chicago (American Legal Publishing, codelibrary.amlegal.com)URL: https://codelibrary.amlegal.com/codes/chicago/latest/chicago_il/0-0-0-2687425Fetched: 10/24/2026

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