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So I ran into a bit of an issue with my first smoke attempt. I attached a hose to the output end of the smoker to get it to reach into the smoking pan. When I did that it seems the back pressure created is a bit too much for the fish tank pump that I am using. I was not getting enough airflow to stoke the wood chips or effectively push the smoke.
Seal the air leaks..... around the lid on the tin.... under the floor flange that sits on the lid.... etc..... the fish air pump won't put out too much pressure... maybe 2#'s or so... 4' head pressure has been my experience..... Dave