Ok, I have 2 masonry fireplaces, one of which had this gas log burning assembley installed over the ash pit lid (it's secured in some way, probably have to unbolt at some point. I removed the rock logs and there is this pipe like thing on the end of the gas line and is attached to this tray like thingy full of little rocks of some sort. Now I want to burn wood in this thing. (in fact, have a fire going in it now, used the gas to get the wood started then turned it off. Do I need to remove the line/pipe/grate thing to do this safely, or can I leave it in to start my fires? My other place is just a straight wood burning fireplace. Is my house going to blow up? Is the assembly something I can remove myself or do I need a professional?