Obviously inspired by the Iron Chests mod.
Iron Furnaces is a mod that adds metal furnaces for Minecraft with all having different speeds.
These furnaces function the same as the vanilla furnace, the only thing that has changed is the speed.
A config is also provided,
.minecraft/config/ironfurnaces.toml & .minecraft/config/ironfurnaces-client.toml
In there u can change the speed of all furnaces, maximum is to wait one hour for the furnace to smelt. Which is 72000 ticks. You can't use values below 2 or values above 72000.
Recipes can be viewed in the "Image" tab.
This mod is open source, and may be used in any modpacks.
Modpacks already using this mod can be viewed under Relations -> Dependents