It is really just a steel box inside of another steel box.
Build a outdoor wood furnace.
Both diy one and factory made one furnace type 1.
How to build an inexpensive outdoor forced air wood burning heater if wood is available but you are unable to safely utilize it as a heat source due to the fact that your permanent or temporary shelter happens to be a recreational vehicle rv mobile home or travel trailer then this idea may be helpful.
The measurement of the bottom needs to be 1 1 2 bigger on the sides and for the back side.
But starting from easy to hard there are a number of ways of building a diy outdoor wood furnace.
To start there needs to be 3 pieces of 1 2 steel laid out for the bottom of the furnace.
A homemade outdoor wood furnace can be made very simply and run off a small duck fan that is inside the ducking.
Installing a diy outdoor wood furnace.
Installing an outdoor wood furnace.
Making your own furnace instead of purchasing a ready made one might be easier than you think.
You can certainly build a clean burning outside wood burning furnace given access to the right materials and sufficient welding skills.
Remember that welding such thick materials is quite different from welding 1 8 steel because proper penetration is paramount to your success.