Smokeless stoves can really be "smokeless", saving wood and having high efficiency. However, it is required that the chimney should be more than three meters, and refractory bricks can be used to achieve higher thermal insulation performance. Therefore, the volume is relatively large, firewood should be dried in advance and cut into 40 cm long sections, and the oven door should be closed after being put into the furnace. The only disadvantages are large ventilation effect, fast air velocity in the furnace and strong oxidation. The iron pot will burn out in less than a year.