Originally Posted by Vulcanus
I would create a unique big lower air intake, but the intake tube must be put directly under the centre of the fire basket (not laterally).
I would create a simple air diffuser to prevent the ash clogging the air intake tube and also for better air distribution like a chimney cowl
Here is a link to my build http://www.bbq-brethren.com/forum/sh...postcount=6890
It has a very effective bottom diffuser, and a simple ash pan made out of a pizza pan (I had way too many issues with high rimmed ash pans and honestly they don't do anything that the pizza pan and fire basket do not already do.
The diffuser was made by cutting tabs on a piece of metal, and bending every other one down. I suspect a cut out drum top would make a perfect piece of doner metal. I went with the diffuser to even the burn with blower based system.