Reverse flow firebox ash pan depth....

Don't really have an ash pan, but I build a grate that keeps my fire elevated about 3 inches above the floor. Starting clean it will accumulate about 2 inches of ash after 15-20 hours burn time leaving a good inch or so to get clean air to the fire. My firebox in a cube with a flat floor lined with firebrick splits 1-1/4" thick.
 
i use the charcoal pan that came with my smoker that is used in the warmer for dedicated grilling cooks. fits perfectly under the fire basket. i think is about 2 inches deep maybe
 
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