By making a comparison between coal furnace with vents behind the furnace with coal furnace with vents on the bottom oven, and using a long bamboo rhizomes on 1 size 70 cm-fuel in the charcoal kiln performance tests.
Comparison between the incinerator with air vents on the back burner. With the incinerator with air vents below the oven and use a bamboo rod one centimeter long, 70 to fuel efficiency of the incinerator.
The comparison between the charcoal kilns with vents behind the stove. With the charcoal kilns with vents below the stove and the use of bamboo 1 size pieces 70 cm long As the fuel in the efficiency test of charcoal kilns.