Help! I am having some issues with a kiln yard set up. I am firing with natural gas that has been set up by the city. The gas line is hooked up to a cone 10 downdraft about 30 cubic with safety features. The same line goes to a fiber drum raku kiln with a seperate safety system and then the same gas line goes to another cone 10 up-draft again with safety features. Each kiln has seperate turn-offs, safety systems and all fire great! But I do not fire all at the same time. Here is whre I need the help. The city inspector is questioning the safety of the "gang" system. My experience shows this to be standard. Any ideas where I can get "professional" explanations of the validity of this system!?