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It is a smoke generator. Seems to be working OK. The burner below set on low burns the wood chunks. The burner also helped heat up the intake pipe that goes into the smoker. So while the smoker was coming up to temp the intake piping was being warmed up which has always been a challenge for me. The top plate throttles the burn, and a fish pump helps push the smoke into the smoker. The smoke seems very subtle which is what I want.
Just finished our first smoke with the new smoke generator rig - and what a difference! the steaks had a very subtle wood smoke flavor. The amount of smoke was very controlled which is what we wanted.