Mid Game Iron Foundry

%94 Efficiency Mid to Late Game Iron Furnaces

1- Belts are placed economy wise and should be feeded with iron-coal-limestone from inside out.
2- Just connect slug and exhaust exits to facilities/storages as you fit.
3- %94 Efficiency can be avoided by simply feeding missing 30 iron input for last furnace.
4- You can pause iron and coal feeding at the beginning for let limestone feed all furnaces then start if it disturbs you.
5- Its best to build this when you recently reached tier three tech. I know graphite and arch furnaces might be more efficient...

INPUTS
480/m Crushed Iron Ore
150/m Coal
60/m Limestone

OUTPUTS
450/m Iron
180/m Slug
360/m Exhaust