No person shall enter or cause to be entered any stovepipe into an outlet other than a brick chimney constructed with what is known as flue lining, well-burned clay or terra cotta pipe, or run a stovepipe through any partition, floor or roof, except through a ventilator in such partition, floor or roof. All chimneys constructed in the City after July 8, 1943, shall be lined continuously on the inside with such materials as hereinbefore provided, shall be made smooth on the inside from the bottom of the flue or from the throat of the fireplace, if the flue starts from the latter, and shall be carried up continuously to the extreme height of the flue. The ends of all lining pipes shall be made to fit closely together and the pipe shall be built in as the flue or flues are carried up and shall extend at least six inches above the cap of the chimney. Each flue shall be enclosed on all sides with not less than four inches of solid brickwork properly banded together, and the withes of brickwork between the lines flues on the inside of the chimney shall be four inches in thickness. All chimneys, flues and fireplaces shall be kept at all times clean and free from accumulation of soot, ashes and cinders, and in good and proper repair.
(1958 Code § 8.17)