>>979071It is a downdraft stove. The sides of the stove are hollow and form a chimney. The air in them heats up and when hot enough they suck the center air downward. They are pretty neat, you should make one using some tin cans. It is really easy to make and there's tons of vids and tutorials online. the ones that used forced air or are very tall usually have the blue flames which are the best ones. The yellow-red flame ones are not as good, but that is all about how fast the air is flowing. If you make one and don't want forced air, make it much taller and that should help a lot.
If you have it properly designed and these things are actually difficult to design correctly due to the proper ratios, you'll see the flames and such going down into the fuel.
