I was having problems with having deadspots (no fire) in my firebox. The grate that came with my smoker has 2" gaps in it, and I found that as the lump charcoal/wood burned down, it was falling through the grate and restricting airflow.
The bottom of that basket has like 3/4" gaps and sits a full 2.5" off the bottom of the firebox. So the airflow is absolutely perfect.
I'm guessing that with 4 pounds of lump and a few pieces of wood, I could close the damper to 1/2 and it would burn at 200 degrees for several hours.
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