I have an odd question that I have not been able to find the answer for or maybe I have over looked threads with the answer. Does the location of the exhaust exit matter? As in can I put the exit just about any where? For example having the exhaust come out of the side instead directly across from the burn tunnel? I'm not talking about coming out of the side of the barrel. The exhaust will still be located at the base of the unit but coming out at a 45 from the burn tunnel. I hope this makes sense. I'm heating a poly-carb aluminum greenhouse.