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Atmospheric vents, gas reliefs, or bleeds.

Municipal Code of Chicago § 18-28-927.6
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18-28-927.6 Atmospheric vents, gas reliefs, or bleeds. Recirculating direct gas-fired industrial air heaters with valve train components equipped with atmospheric, vents, gas reliefs, or bleeds shall have their vent lines, gas reliefs, or bleeds lead to a safe point outdoors. Means shall be employed on these lines to prevent water from entering and to prevent blockage from insects and foreign matter. An atmospheric vent line shall not be required to be provided on a valve train component equipped with a listed vent limiter.
Source: City of Chicago, Municipal Code of Chicago (American Legal Publishing, codelibrary.amlegal.com)URL: https://codelibrary.amlegal.com/codes/chicago/latest/chicago_il/0-0-0-2688528Fetched: 10/24/2026

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