Hole diameter: large hole 13cm, small hole 10.5cm Heating method: liquefied petroleum gas Weight: 45kg Output: 15-20kg Ignite the fuel and preheat it for 10-30 minutes. Put the large food material in the middle and the small food material in the side. Put 3-5 food materials in each hole. Close the door after 9 holes of the whole oven are filled with food materials. Turn it up and down after natural baking for 10-20 minutes. Those far from the fire source will bake slowly and those close to the fire source will bake faster. In short, the purpose is to turn it up and down evenly.