Bronze Blast Furnace (GregTech 4)

The Bronze Blast Furnace is a multiblock machine introduced by GregTech 4. Unlike Industrial Blast Furnace, Bronze Blast Furnace has only one function: smelting Iron ingot into Steel ingot. Bronze Blast Furnace accepts Coal, Charcoal and Coal Coke as fuel and produce Dark Ashes as the byproduct. The purpose of this blast furnace is to help players get their first steel ingot so that they can step into electrical age.

Construction
Do note that multiple Bronze Blast Furnace can share their structure, allowing players to build more Bronze Blast Furnaces with a relatively low cost.