Take a sponge and wipe the wall above your fireplace. You might find the sponge comes up dirty or sooty, even if the wall looks clean. Now imagine that film on the screen. The plasma unit may retain some charge even when turned off that would make it even more attractive for smoke particles/soot. Like Unclejeff, I have misgivings about the location.
Plasma Bracket for above Fireplace question???
Does anyone know who makes a bracket that you can use to hang a plasma above the fireplace but that allows you to move the plasma away from the wall and lower it in front of the fireplace. That would lower the plasma to a lower level more in line with our line of sight. Thanks!