Originally Posted by cholloway
I feel the secret to a clean fire is keeping a good bed of HOT coals under the splits.
You get that going and you could throw a concrete block in there and it'll burn!
Oh yeah... pre-heat the splits before you put them in the firebox. Makes a world of difference.
Also, if you can, the air intake needs to be below the fire, so that it pulls the air through/across the coals; makes hotter. I've raised mine (the grate) up a few inches and have had much better results.