A homemade outdoor wood furnace can be made very simply and run off a small duck fan that is inside the ducking.
Build your own outside wood furnace.
The furnace builder allows you to customize the product the size and the features of your outdoor wood boiler so that you don t pay for anything you don t need and so you get all the features you want for the most affordable possible cost.
To start there needs to be 3 pieces of 1 2 steel laid out for the bottom of the furnace.
Build your own outdoor boiler here.
Remember that welding such thick materials is quite different from welding 1 8 steel because proper penetration is paramount to your success.
A round firebox or cylinder is definitely the way to go.