Here’s how to make an emergency wood stove, using metal 5 gallon buckets – “The stove is a basic Franklin design. The body is built from nested shop buckets; the upper buckets have their bottoms removed to extend the length of the firebox, while the bottom two buckets keep their bottoms to provide a dead air space between the firebox and the floor. The grating, which rests upon the brick fragments, raises the fuel above the ventilation holes at the bottom of the firebox. The stovepipe is prevented from falling through to the bottom of the firebox by the screw inserted at its base.” Thanks, Pekar! – Link.