Stove manual referred to as "straight hot hot stove" is the use of natural wind outside walls in the hot gas into the furnace after the cycle of warm-up cavity, negative pressure in the air under the principle of work to achieve full-fired, the effect of energy saving It is mainly used in the product the appearance of the requirements of the heat source is not strictly business. Hot gas at the suction fan, the outside air from the furnace into the furnace chamber at the top of chamber, to preheat the oven cavity, into the furnace, then hot air into the rotary drum.