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Filtering.

Municipal Code of Chicago § 18-28-1502.6
in effect
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18-28-1502.6 Filtering. Air transported to occupied spaces through rock or dust-producing materials by means other than natural convection shall be filtered at the outlet from the heat storage system.
Source: City of Chicago, Municipal Code of Chicago (American Legal Publishing, codelibrary.amlegal.com)URL: https://codelibrary.amlegal.com/codes/chicago/latest/chicago_il/0-0-0-2689297Fetched: 10/24/2026

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18-28-1502.6 | Corpus