I rigged up a metal 5 gallon bucket to the exhaust of a 4KW generator and got huge amount of fog out of it in minutes.
But after the fog began to die down it started up again with smoke…
No tempretures control, and so stopped it and dumped it out.
Bottom 1/3 was dry and charcoal parts on fire. Top 2/3 still wet wood.
It worked, I guess but until the whole mass is above 212 deg you are actually adding water from the condensation in the exhaust
I believe a heat exchanger is needed so only dry hot air is injected