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Gas-fired direct-vent wall furnaces.

Municipal Code of Chicago § 18-28-909.9
in effect
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18-28-909.9 Gas-fired direct-vent wall furnaces. Direct-vent wall furnaces shall be installed with the vent-air intake terminal in the outside atmosphere. The thickness of the walls on which the furnace is mounted shall be within the range of wall thickness marked on the furnace and covered in the manufacturers' installation instructions.
Source: City of Chicago, Municipal Code of Chicago (American Legal Publishing, codelibrary.amlegal.com)URL: https://codelibrary.amlegal.com/codes/chicago/latest/chicago_il/0-0-0-2688143Fetched: 10/24/2026

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18-28-909.9 | Corpus