The Large Furnace is for players who want to smelt large amounts of ore at a time and spend less Low Grade Fuel making the furnace, and less wood in the operating costs. This variation of the Furnace is much more efficient, and has a whopping 18 slots! It is still very costly, but if you have the resources, consider investing in this production machine. However, there is one downfall to the Large Furnace: it must be placed on open terrain. It cannot be placed in the build zones down in caves or on a foundation, although it is possible to surround it with walls right next to it, unlike a Mining Quarry.
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