Be Careful.
As said, you want good ventilation. Ventilation brings in cold air, kind of negating the whole purpose for having a camp heater in the first place.
If you are warm, then that means you are probably not doing it right. You want the air "fresh": meaning not as cold as outside. You still want enough fresh air to keep it cool.
Have you thought about making a stove-pipe adapter to wick away exhaust gasses? Simply getting some aluminum duct pipe and a little stand to prop the pipe up over top of the burner. Works well in an ice-fishing shack.
I would recommend you have a good buddy look at your system to make sure that ventilation is adequate. I have a couple of buddies who are HVAC guys, so they are the experts.
