Primitive Blast Furnace

The Primitive Blast Furnace (henceforth abbreviated PBF) is a multiblock structure used to create steel before the player creates their first electric machines.

Structure
The PBF is constructed using Primitive Bricks (B) and a Primitive Blast Furnace (F) as follows:

Operating
The only non-fuel items that the PBF will accept are iron ingots, which will be converted into steel ingots, a process that takes approximately 75 seconds (1 min, 15 seconds or 1,500 ticks) regardless of the fuel used.

Fuel
Only the following fuels may be used in the PBF. If 2 fuel is required, 2 tiny piles of dark ashes will be produces, otherwise only 1 is produced.
 * Charcoal (x2)
 * Coal (Dust) (x2)
 * Coke (Dust)

GUI
Inputs (1/2)

Outputs (3/4)
 * 1) Iron Ingots
 * 2) Fuel (see above)
 * 3) Steel Ingots
 * 4) Tiny piles of Dark Ashes