Sec. 11-155. Evacuation of persons

When, in the opinion of the Fire Chief or authorized representative, there is actual danger to the occupants or those in the proximity of any building, structure or premises, to include single-family dwellings, because of apparent danger of collapse or inadequacy of any exit way, the presence of explosives, explosive fumes or vapors, flammable liquids, vapors, gas or other presence of toxic fumes, gases or material, the Fire Chief or authorized representative may order the immediate evacuation of such building, structure or premises. Upon issuance of the said order, all occupants shall immediately leave the building, structure or premises and no one shall enter or reenter until authorized to do so by the Fire Chief or authorized representative.