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System pressure.

Municipal Code of Chicago § 18-28-1305.5
in effect
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18-28-1305.5 System pressure. The system shall be designed for the maximum pressure required by the fuel-oil-burning appliance. Air or other gases shall not be used to pressurize tanks.
Source: City of Chicago, Municipal Code of Chicago (American Legal Publishing, codelibrary.amlegal.com)URL: https://codelibrary.amlegal.com/codes/chicago/latest/chicago_il/0-0-0-2689218Fetched: 10/24/2026

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18-28-1305.5 | Corpus