We live in northwest Ohio and in the country. I honestly believe the construction of these furnaces are just as safe or safer than what the indoor furnaces are. Both my wife and I grew up burning wood inside the home. We had a furnace in the basement, fireplaces in the living rooms, and also a wood burner in the den of our cabin. Not all at once, but in different homes we've lived in over the years. I don't recall too many years we didn't cut wood either for ourselves or other family/friends. It's just what we did. Now, years later, the wife and I wanted to save on propane and start burning wood again but having bugs and bark inside our home wasn't an option. We chose the outdoor model to keep that stuff outside. I honestly don't see how it is any "more" unsafe to have these inside a pole barn, outbuilding, or some sort of leanto. There are just as many concerns with chimney fires whether it's an indoor model or outdoor model. The smoke, bugs, soot, and wood debris is kept outdoors. Heck, we should get a discount on our insurance!
I've seen many posts on here and heard many people installing these under roof of some sort. Thanks for posting. I'm still planning to leave mine in my barn. One of the best investments I've every made. All comments are appreciated.