I am trying to install a TV above my fireplace (I know) and I hit something that looks like a metal pipe and I'm worried it's a gas pipe. Logically I assume no one would ever install a gas line above a fireplace because of combustion probabilities. I have no reason to think there'd be a gas line except for the fact that it's a fireplace and what the hell else would a small metal pipe be doing above a fireplace? There is no indication that it was ever a gas fireplace, there's a metal fire box inside the fireplace but no gas line or knob. Thoughts?