The mayor, the chief and the chief of the bureau of fire prevention shall act as a committee to determine and specify, after giving affected persons an opportunity to be heard, any new materials, processes or occupancies, which shall require permits, in addition to those now enumerated in this code. The chief of the bureau of fire prevention shall post such list in a conspicuous place in his office, and distribute copies thereof to interested persons. (Prior code § 6-7-8)