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|This article is about the current version of DF.
Note that some content may still need to be updated.
To function, magma smelters must be built with at least one of the eight edge tiles occupying an open space with at least 4/7 magma on the next floor down. This magma can be natural, or channeled from a larger source, or otherwise transported from another level to a trench designed to hold the magma.
Magma smelters do not consume any magma from their magma source - you can use a single tile of 4/7 (or deeper) magma below the smelter as an infinite heat source. Note that both pig iron and steel production still require either coke or charcoal as a part of the recipe, as a source of carbon for the reaction.
Creatures can climb up through the open tile that the building is built on, making them a potential entry point into your fortress. The smelter in older versions had an impassable tile that could be used to prevent this, but it has been removed as of v50.
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