Dear Ken,
Your practicality makes more sense. When drying wood, if you give the heat from bottom, wet air always raise up to top. That can be the pressure from wood chips, or just simply " hot air raise". In the actual drying wood chips or whatever, the moisture coming from the exhaust do not make any differents at all, unless we are trying to calculate scientifically how much exhaust gas can dry what amount of wood chips, at what degrees???? Than we must try to calculate the exhaust heat, because it varies depending on the rpm of the engine, than the difference will be insignificant. What important is you put the heat from bottom, and it will raise as it dries wood and carry the moisture with it.. Do not forget the install vents.
Regards,
Robert

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