Jumbo Furnace is a mod that adds the Jumbo Furnace. The Jumbo Furnace can be created by placing 27 furnace blocks in a 3x3x3 cube. You can itemize the jumbo furnace by using shears on it or baking 27 furnaces in a jumbo furnace.

The Jumbo Furnace has a larger inventory than a regular furnace. Because the Jumbo Furnace can smelt multiple recipes at a time, it has a fixed cooking cycle time for all jumbo smelting recipes (specified in your world folder's serverconfig/jumbofurnace-server.toml file). Vanilla smelting recipes with higher cooking times than jumbo furnace's cycle time cannot be smelted in the jumbo furnace.

The Jumbo Furnace is fully compatible with hoppers and other item handlers; the top faces access the input inventory, the side faces access the fuel inventory, and the bottom faces access the output inventory.

The Jumbo Furnace supports recipes that require up to nine ingredients. The Jumbo Furnace supports the standard ingredient types added by Minecraft and by Forge, and should generally work with json ingredient types added by other mods. These recipes can be defined in json by using the "jumbofurnace:jumbo_smelting" recipe type. An example of a jumbo smelting recipe:
{
"type": "jumbofurnace:jumbo_smelting",
"ingredients":
[
{
"type": "forge:nbt",
"item": "minecraft:furnace",
"count": 27
}
],
"result":
{
"item": "jumbofurnace:jumbo_furnace"
},
"experience": 0.1
}
This is an example of how a JSON recipe that takes multiple ingredients can be defined. The Jumbo Furnace supports these recipes, but this mod does not add any by itself. Note that cooking times for Jumbo Furnace recipes cannot be specified per-recipe.
Every face of the Jumbo Furnace is connected to one of its three inventories; the top faces access its inputs, the side faces access its fuel, and the bottom faces access its outputs.
The Jumbo Furnace can use standard smelting recipes in addition to its special recipes.
Automatically formed when a solid cube of furnaces is placed by a player. The furnaces don't have to face a particular direction.
The "jumbofurnace:tag_stack" ingredient type takes an item tag ID and a stack size count. This ingredient type allows recipes to use items-from-a-given-tag with stack sizes greater than 1.