Well i tried making one by putting fire bricks on top of a piece of shelfing, the steel kind you see in grocery stores with a bunch of holes in it, inside a cast iron stove. I tried it like that with a fan blowing air under the door of the stove and under the shelf but I don't think it got hot enough. So now I ran a piece of drilled pipe under the shelf and i will blow air out of that.
Think it will work?