On Jan 21, 10:14*am, (Doug Miller) wrote:

120V outlets in mantels are common. Datacomm, less so, but only because it's
been around less time. Go for it.

Second what Doug said.

You didn't say whether or not this was a "heatalator" or one of its
cousins or a brick lined fireplace. If it is the self contained metal
box with the fake bricks in it (99% of them are anymore) you shouldn't
have any clearance or leak issues by running your wiring any way you
want.

Many times though, when we repair chimney leaks the "real deal"
chimneys have small leaks that develop over the years from one reason
or another. Make sure you put a drip loop in the Romex so that if the
water follows the Romex down to the plug it won't drain into the plug
itself. Think of the P trap under your sink.

Robert