Branches.
Municipal Code of Chicago § 18-29-912.2.1
in effect18-29-912.2.1 Branches.
A branch more than 15 feet (4.57 m) in length shall be separately vented. The minimum area of any vent installed in a combination waste and vent system shall be one-half the diameter of the drain pipe served, but not less than the minimum indicated in Table 18-29-916.1.
Source: City of Chicago, Municipal Code of Chicago (American Legal Publishing, codelibrary.amlegal.com)URL: https://codelibrary.amlegal.com/codes/chicago/latest/chicago_il/0-0-0-2692514Fetched: 10/24/2026
