Inside the smoking barrel, there is a dia. 4" pipe as burner.
Inside the burner, there is a dia. 1" perforated air pipe, optional.
Need more test to see whether the air pipe is necessary or not.
Outside is a blower.
The burner can be pull out or push back for refilling.
can light the fuel from left or right. The fuel can be on fire all at same time.
Or the fuel can burn step by step backward.
can put an reverse "V" plate above the burner to collect grease, beside the burner there are 2 water/grease pans to receive grease
remove the burner, but leave air pipe there, it can be used for high temperature grilling.
There are may be 2 blowers at both ends