I used google to see what methods the pros used. It boiled down to 2 principles= Reverse circulation and heat retention. A lot of people will tell you about controlling the air with inlet and outlet dampers and using gas to supplement the coals.But it is all a workaround for a piss poor design.
Originally Posted by hurtinhvac
Use the reverse circulation design with thick metal and you will have a super smoker.
Google "reverse flow smoker", and remember the thicker the metal the more heat it will retain. Stay away from 50 gallon barrel type designs.
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