General.
Municipal Code of Chicago § 18-28-802.1
in effect18-28-802.1 General.
All vent systems shall be listed and labeled. Type L vents and pellet vents shall be tested in accordance with UL 641.
Source: City of Chicago, Municipal Code of Chicago (American Legal Publishing, codelibrary.amlegal.com)URL: https://codelibrary.amlegal.com/codes/chicago/latest/chicago_il/0-0-0-2687825Fetched: 10/24/2026
