Alright heres another question for you all. If you have read Bernard Wilkie's book creating special effects for tv and video then you may remember reading about this device. A flame fork is essential metal tubing connected to a propane tank. the metal tubing can either have holes drilled in it or just be connected to multiple tubes to resemble a fork. This can be used to give the illusion of burning furniture, or if you use copper pipe that is easily bent could feasably be used to add some flare to a set when warrented. Besides the obvious safety concern that the area must be clear, only use this effect if the person who will operate it can see the area where flames will come out so that they are sure it is clear before the effect goes. I know from welding that you have flashback arrestors and the like because the gas may travel back to the tank. And it seems that most propane tanks dont really but out a whole lot of pressure which would make me think the likelyhood of a flashback would be greater. So has anyone ever tried this effect? Any ideas on safety precautions necessary? I would probably stick a flashback arrestor on just to be safe rather than sorry but maybe im wrong and theres somthing about propane that it wont flashback?