a wood waste burner, known as a teepee burner or wigwam burner in the united states and a beehive burner in canada, is a free-standing conical steel structure usually ranging from 30 to 60 feet in height. they are named for their resemblance to beehives, teepees or wigwams. a sawdust burner is cylindrical. they have an opening at the top that is covered with a steel grill or mesh to keep sparks and glowing embers from escaping. sawdust and wood scraps are delivered to an opening near the top of the cone by means of a conveyor belt or archimedes' screw, whereupon they fall onto the fire near the center of the structure.