A. Chimneys for high-pressure boilers, furnaces used in manufacture, or for other heating appliances where high temperatures are maintained, and all isolated chimneys, shall be designed and built in accordance with good engineering practice and so that the stress in every part thereof, due to temperature changes, wind pressure and the weight of the chimney itself, shall not exceed the safe limits specified in this Chapter for the materials used.
B. All ordinary chimneys which form a part of building construction shall conform to the standards for chimney construction under the title concerning chimneys as contained in the latest edition of the Building Code Recommendations by the National Board of Fire Underwriters. (1964 Code § 298)