Tom - years ago I lived in a house that was heated with a woodstove in the living room. I thought it was a little closer to the wall than it should be. I made a folding heat screen with 1/4" rod perimeter, three or four small hinges to allow it to fold and store in warm months, and the screen was simply metal plaster lath. That lathing is lightweight expanded metal, and it came in 2' widths, 4' long (I think, but mebbe 8'). Painted it black - wall behind it was cool to the touch, but you couldn't hold your hand on the screen. I had about $10 in it. In 1975. Might cost a hundred today, ha.