BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a furnace used for charcoal grilling and the like, and more particularly to a laminating furnace capable of stacking a plurality of constituent elements and adjusting the size of the furnace. According to the present invention, there is provided an air conditioner comprising: an air supply unit for supplying outside air to a lower position; and a furnace body having a space therein for receiving fuel, wherein the furnace body is wide at the upper part, narrower at the lower part, And the plurality of furnace units are formed so as to be partially overlapped with each other and can be selectively stacked to adjust the size of the furnace units.
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