40d:Furnace

Furnaces must be built from fire-safe materials.
Magma furnaces have to be built from magma-safe materials and must have (3/7 ?) magma accessible from below one of the 8 boundary tiles; this can be accomplished by digging a channel.
They are otherwise identical to workshops.^{v0.23.130.23a}

Wood furnace

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Materials needed to build – 1 fire-safe building material
Materials used – wood
Items made – ash, charcoal

Smelter

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Materials needed to build – 1 fire-safe building material
Materials used –
Items made – All ores into all metal bars

Glass furnace

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Materials needed to build –
Materials used –
Items made –

Kiln

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Materials needed to build –
Materials used –
Items made –

Magma smelter

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Materials needed to build –
Materials used –
Items made –

Magma glass furnace

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Materials needed to build –
Materials used –
Items made –

Magma kiln

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Materials needed to build –
Materials used –
Items made –