When hydrocyanic acid gas, or other dangerous gases or fumes, are to be used for fumigation, the person undertaking such fumigation shall personally inspect the premises before beginning the fumigation and shall serve notice over his signature upon all responsible occupants of each room or apartment within the danger area, stating the danger of the process and the precautions to be observed, designating the rooms or apartments that must be vacated and indicating the time when the gas is to be generated or liberated. The form of this notice must be approved by the director. (Ord. Nos. 3281; 27697)