My father-in-law had a gas F.Place installed in his basement and had it framed in. He wants me to come and finish it up. Over the F.P. he wants to frame it in to put in a TV. Is there something I should do to keep the heat from the bottom of the shelve and TV. The fireplace is vented out the back and through the wall. Also, what's the norm on what to install around the opening,I mean, does it have to be tile,rock ,or marble. Thanks, Ron J.