The Electric Blast Furnace is a 4-block high hollow 3x3 box. The top layer is constructed from 8 Heat Proof Machine Casings around one Muffler Hatch. The Muffler Hatch must be facing up and must be facing an air block.
The two hollow middle layers are constructed from 16 Heating Coils.
The bottom layer is more mixed, and must contain the following:
1 Electric Blast Furnace control block, placed in the middle of a side