Indoor furnas used out doors

On the other hand, there are many ways to install a woodfurnace, as I described, very safely.

I also don't think I'd go to a firechief for techincal advice on such matters.

I did something on one of my outdoor workshops that works great - much better than I'd expected. It was a big, Thermocontrol Model 500 wood-furnace (that's the brand, made in New York).
I pulled it out of a scrap-metal pile. Brought it home, set it about 10 feet from my shop. Then built a room around it, and when all done, opened up the one wall. So, now there was a small offset room with the woodfurnace. I built a sloping ceiling, angling down as it went out. That way, it sheds snow and water - but inside works great at aiding convection. Ceiling is 5/8" sheetrock - but is also shielded with scrap metal roofing - spaced a inch off the ceiling. With that air-space between the steel and ceiling, the ceiling barely ever gets warm. Back wall behind the furnace is setup the same way. I'll skip the rest of the details. But, I had originally planned on finding away to add a plenum and blower to the furnace. But, after using it the first winter, I found it heats the entire building fine just with convection. It's a three story barn, 26 X 36, with a 40 X 40 one-story addition on it. I go out there when its below zero, and it gets warm in there fast once the fire is going. The most expensive part of the installation was the stainless-steel chimney - which is not worth cutting corners on - not to me, anyway.

As I posted earlier, I also heat my house with a hot-air EPA rated wood-furnace with a room built around it - but that setup is much different than in my shop/barn. My longest air-duct run goes underground and runs 40 feet to heat most distant part of my house. The duct is well insulated and 12" diameter round, and very hot air going into it, comes out just warm enough to heat the most remote room. If that duct was any longer, it would just be blowing cold air.

--->Paul

Seems having it in the barn, and getting some "free" convection heat would be a bonus.

I did the opposite. I've got an outside-furnace installed inside - and it works great. I built an insulated room around it with a burn-out proof Canadian chimney. I never have to go outside to load it, and - if I bring damp wood in, it's dry in a matter of days. The room also works great for hanging wet winter clothes in - they dry out in hours.

The two big concerns with any chimney - is #1 how well insulated they are so they stay hot and therefore stay clean, and #2 if they happen to catch fire - how fire-proof are they.
The Canadian version far exceeds anything sold in the U.S. by both counts and has a 4" thick layer of insulation around it besides some dead-air spaces. I'd have to check my records to be sure, but at I recall the chimney system I bought is:

The S-2100+ high temperature chimney meets and widely exceeds the most stringent testing standards in line with harsh Canadian weather conditions. The S2100+ is a high quality product offering maximum protection from chimney fires capable of reaching temperatures of 2100�F. Exceeds all ULC standards.

I'm not saying what is wrong or right; just that outdoor equipment just is not allowed - on principle- indoors, never mind how well a job you did.

--->Paul

The plain fact is, I did a good safe insulation and they are fine with it.