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Positive pressure.

Municipal Code of Chicago § 18-28-801.9
in effect
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18-28-801.9 Positive pressure. If an appliance equipped with a forced or induced draft system creates a positive pressure in the venting system, the venting system shall be designed for positive pressure applications.
Source: City of Chicago, Municipal Code of Chicago (American Legal Publishing, codelibrary.amlegal.com)URL: https://codelibrary.amlegal.com/codes/chicago/latest/chicago_il/0-0-0-2687781Fetched: 10/24/2026

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18-28-801.9 | Corpus