Prototype MK2 - Upgraded double-sided steel smelting setup. Should be able to output a full belt, but is less suitable for stone and steel furnaces. : r/factorio
I've made some factorio compressed furnaces setups... : r/factorio
single or double belt lines between furnaces? - Factorio Forums
Factorio: How to Build a Smelting Setup – Tutorial
The Factorio Benchmark Website
Factorio Stuff — Smelting Lines - part two
Factorio": How to Build a Furnace/Smelting Setup - LevelSkip
Smelting where you mine - Factorio Forums
Steam Community :: Guide :: Factorio - Everything To Do With Smelting: Belt & Bot Based