Building: a full floor of seared blocks, a ring of seared walls on top (corners optional), air inside, open top. The 
Smeltery Controller sits in the wall facing out.
Inside 1×1 up to 14×14, up to 64 layers high. Every layer must be closed all around.
Per inside block: 1 melting slot and 12 ingots (1080 mB) of room.
Fuel: a 
Seared Fuel Tank in the wall with lava (1000 °C, 50 mB = 5 s) or Blazing Blood (1500 °C, 1.5× faster). Bigger smelteries burn more.
Ore doubling: ore and raw ore give 2 ingots (180 mB). Ingot 90 mB, nugget 10 mB, block 810 mB.
The GUI stacks fluids in layers: the bottom one flows out. Click a layer to move it down. A 
Seared Drain in the wall + 
Seared Faucet pour it.
Crafting Table3 × 3
1 × Seared Drain
Crafting Table3 × 3
1 × Seared Fuel Tank
Crafting Table3 × 3
1 × Seared Ingot Tank