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The main drain from every building shall be laid outside the walls of the building so far as is practicable and shall have a trap and fresh air inlet located through the cellar wall. This fresh air inlet shall connect with the outer air by a pipe not less than four inches in diameter. The opening shall be properly protected with iron box or by other means acceptable to the City Engineer.
(1967 Code, § 16-8) Penalty, see § 10.99