[allan5oh]

I don't understand why would the exhaust flow back into the shop? Do you not have a flue that leads out the roof? Or are you talking the exhaust does not float away from the top of the flue enough? If it's the latter the exhaust is cooling too much. The flue also needs to be properly sized.


I read your last reply, it's better if it goes straight up. You could also try insulating/double walling the flue pipe on the outside. It's cooling too much.