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Vacuum.

Municipal Code of Chicago § 18-28-1502.4.2
in effect
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18-28-1502.4.2 Vacuum. If solar energy system components are subjected to a vacuum while the system is in operation or during shutdown, the components shall be designed to withstand the vacuum or shall be protected from the vacuum with vacuum relief valves.
Source: City of Chicago, Municipal Code of Chicago (American Legal Publishing, codelibrary.amlegal.com)URL: https://codelibrary.amlegal.com/codes/chicago/latest/chicago_il/0-0-0-2689289Fetched: 10/24/2026

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18-28-1502.4.2 | Corpus