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Circulating air ducts for forced-air warm-air furnaces.

Municipal Code of Chicago § 18-28-918.5
in effect
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18-28-918.5 Circulating air ducts for forced-air warm-air furnaces. Circulating air for fuel-burning, forced-air-type, warm-air furnaces shall be conducted into the blower housing from outside the furnace enclosure by continuous air-tight ducts.
Source: City of Chicago, Municipal Code of Chicago (American Legal Publishing, codelibrary.amlegal.com)URL: https://codelibrary.amlegal.com/codes/chicago/latest/chicago_il/0-0-0-2688337Fetched: 10/24/2026

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18-28-918.5 | Corpus