Blast Furnace

Blast Furnace is a multiblock structure.
Its purpose is to smelt iron ores with charcoal and some bone ash to make steel.
To build the blast furnace the player will need:

1 Blast Furnace
A minimum of 13 Iron Plated Fire Bricks + 8 Iron Plated Fire Bricks per layer
1 Mechanical Bellows
1 Crucible

Then the blast furnace must be assembled as following:

Layer 0:
Layer 1:
Layer 2+:

The structure can be rotated in any horizontal direction.
Layers 2 and higher are optional.
In the end your blast furnace structure should look like this:

Each layer you add on top of this structure increases the amount of recipes you can process at the same time by 8.
Blast furnace has an interface which can be opened by right clicking on it.
The two slots on the far right are for tuyeres.
In order to input the recipe into the blast furnace the player must toss the ingredients into the opening on the top of the blast furnace.
Ingredients must be tossed stack at a time! If there are more stacks in the blast furnace than the recipe requires then it won't consume the ingredients!
The blast furnace is unable to process different recipes at the same time. It however is capable of processing multiple of the same recipe at a time.
When the blast furnace has tuyeres in it and the recipe is set up it can be activated by right clicking it with a firestarter or a flint and iron.
In order to process the recipe the blast furnace must heat to a specific temperature. In order to process steel the temperature required is so high that the blast furnace will only be able to achieve it with Mechanical Bellows