dakota fire hole

As the fire burns, the hot air that is created goes up through the fire hole “chimney”. This creates a suction action that forcefully draws air down through the tunnel and into the base of the fire. The draft is increased even more by your having constructed the tunnel on the side from which the prevailing wind is coming.
Acting as a kind of bellows, the flames are continuously fanned and the fire burns hotter and more efficiently than a fire that is simply made on the surface to the ground. Hotter fires mean less smoke. In addition, the heat of the fire is concentrated into an upward direction where you can better capture it for use. This allows you to do more with less wood – an excellent survival fire by any measure.

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