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Bathrooms and toilet rooms.

Municipal Code of Chicago § 14X-6-603.3
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14X-6-603.3 Bathrooms and toilet rooms. Every bathroom and toilet room must be provided with any combination of the following: 1. An operable window with an openable area equal to or exceeding four percent of the floor area. 2. Mechanical ventilation complying with Chapter 14X-8. 3. A gravity vent flue constructed with noncombustible materials leading to the roof of the building and providing an aggregate clear area equal to or exceeding five percent of the floor area of the room, but not less than 120 square inches (0.08 m2). Gravity vents must be provided with a weather cap, directional vane, or rotary type ventilation above the roof level.
Source: City of Chicago, Municipal Code of Chicago (American Legal Publishing, codelibrary.amlegal.com)URL: https://codelibrary.amlegal.com/codes/chicago/latest/chicago_il/0-0-0-2676101Fetched: 10/24/2026

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14X-6-603.3 | Corpus