If upon any inspection an inspector discovers that any method of work, packing, or storage is being used which is in conflict with the provisions of this Act or of any regulation, or which, in his opinion, is calculated to endanger the safety of the public or of any person employed in the premises inspected, he may require the immediate discontinuance of that method: Provided that any person who is dissatisfied with a decision that a method is calculated to endanger safety, may within fourteen days thereof, lodge an appeal as provided by regulation.