This study is to compare the efficiency of charcoal kiln size 200 liters horizontal. With the position of different ventilation. The comparison between the charcoal kilns with vents behind the stove and Charcoal kilns with vents below the stove. Use of bamboo 1 long pieces 70 cm As the fuel in the efficiency test of charcoal kilns. By testing properties fuels Standard criteria for Community products. Comparison of the yield of charcoal and production rate of charcoal. The test proved that the charcoal from Charcoal kilns with vents behind the stove. calorific value over Charcoal kilns with vents below the stove. The average percentage 264.780 Cal/g . The charcoal from the charcoal kilns with vents below the Will have moisture of less than. The charcoal from the charcoal kilns with vents behind the stove. The average percentage 0.013 and The charcoal from the charcoal kilns with vents below the stove. ash content less than The charcoal from the charcoal kilns with vents behind the stove. The average percentage ……… In the production of charcoal kilns with vents below the stove. Will yield charcoal over Charcoal kilns with vents behind the stove. The average percentage 4.430 But the charcoal kilns with vents behind the stove. The rate of production charcoal over kilns with vents below the stove. The average percentage 0.972 . Therefore, it can be concluded that the charcoal kilns with vents below the stove. Effective in the production of wood-better. Charcoal kilns with vents behind the stove. Because convection from the stove front Go to the wood in the stove. The passage of smoke (hot air), the more it will be good for to produce charcoal . (is charcoal perfect). The charcoal kilns with vents below the stove. There a passage of smoke (air) more than. Charcoal kilns with vents behind the stove.