Furnace, Wiki

Furnace - Minecraft Wiki, from: minecraft.gamepedia.com/Fur…

Iron Furnaces Mod - Minecraft - MC Wiki

Oxygen Furnace - Captain of Industry Wiki

Muffle furnace - Wikipedia

Portable Smelting Furnace? I've been playing this game for 2 years and have NEVER seen one of these. Couldn't find anything in the WIKI about it either. Have I lost my mind?

Bansal's Wiki: Cores and Furnaces

Furnace, Pure Evil Wiki

Blast Furnace - Minecraft Wiki - Neoseeker

Dredge Furnace - Guild Wars 2 Wiki (GW2W)