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The Dakota fire pit is an efficient, simple fire design that produces little to no smoke. [1] Two small holes are dug in the ground: one for the firewood and the other to provide a draft of air. Small twigs are packed into the fire hole and readily combustible material is set on top and lit.
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The large round hole is a fire pit. The air intake (square hole), the stones blocking air from the intake, the pit and the sipapu form a line: an intentional design. At Long House, Mesa Verde. A sipapu (a Hopi word) was a small hole or indentation in the floor of a kiva (pithouse).
By all appearances, the pit was made after the same basic principle used in a "Dakota fire pit," which is made with an air inlet at the base, allowing for air-ventilation, but on a larger scale. Air intake was achieved by digging an adjacent channel which ran from a short distance into the limepit, or else an underground shaft (shafts) at floor ...
The fire pits presents two major hazards, including the risk of third degree burns dealt in less than a second, caused by flame temperatures over 1,600°F. The commission also warned that flames ...
Underground construction workers often work under reduced light condition, in dangerous spaces, and are at a high risk of exposure to contaminants, fire, and explosions. In the United States the Occupational Safety and Health Administration (OSHA) first adopted unique regulations for underground construction in 1971.
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