-we+learned...


 * Insulative properties of metal affect the burning of the fuel
 * Providing insulation between burning materials and fuel
 * Air pipe openings that are flush with the bottom of the tray work better than air pipe openings that extrude out from the bottom of the tray.
 * Heat concentration through the use of a cone is critical in getting rice hulls hot enough to burn
 * Gradually sloping surface provides a larger burnable area which is also another key component

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