Thanks. Yes, the blow back smoke is an issue. This greenhouse/wood storage building is framed in, but not insulated. I plan on keeping the bulk of the OWB in the heated/greenhouse portion with the exception of the OWB feeding door. ITs hard to explain, but i will fasten thin metal studs to the door side of the OWB to keep the mass of the OWB on the insulated side of the greenhouse. While it woudl be nice to capture the heat coming off the door itself, i dont want to have to go through a series of doors to fill er up...or lose heat from the greenhouse.
so most of the blowback smoke should have a place to exit throught the woodshed portion..which is fairly open on the walls. I have looked at those exhaousto chimney draft induceers to help with the blowback and also help get wet wood burning occasionally..but they are expensive.
The fire wood will not be heated or put in the greenhouse portion, it is in separate area outside the thermal envelope but still under the roof. I hope to grow some food in the greenhouse and maybe have a place to sharpen saws and tune skiis...( I dont have a real garage, which is part of the reason for the investment)
I will post some photos and and maybe the plans for it later, thanks for the comments!