Enchanted furnaces

BadWolfMC has a special plugin that allows you to put the enchantments you're familiar with on regular furnaces in the same way you would enchant (or combine on an anvil) any other tool. These include:

Efficiency - increases the smelting speed.
Fortune - works much like fortune on a pick would by increasing the chances of additional smelting output. For example, 1 iron ore could output 4 ingots!
Silk Touch - saves the time remaining on a fuel type for later use. For example, if you want to smelt just one iron ore and have a blaze rod as your fuel type, this enchantment will stop the fuel usage as soon as the ore has finished and save the remaining fuel for later! Note that breaking and replacing a furnace will lose any saved time with any fuel.
Unbreaking - increases the durability of the respective fuel type (the fuel lasts longer).

Note: while you wouldn't normally be able to combine fortune and silk touch enchantments (since on regular tools they do opposite things), you can with enchanted furnaces.

The Numbers

These come directly from the plugin developer. You can safely ignore this part.

Efficiency (DIG_SPEED)

Increases smelting speed. Stock is 10 seconds per smelt. Time = 20 / (level + 2) seconds Level/Seconds per Smelt

Level	Seconds per smelt
0	10
1	6.7
2	5
3	4
4	3.3
5	2.9

Fortune (LOOT_BONUS_BLOCKS)

Adds additional result chances. Average = (level + 1) / 2 + 1 / (level + 2)

Level	Average Results
0	1
1	1.33
2	1.75
3	2.20

Unbreaking (DURABILITY)

Increases burn time based on fuel. Time = default time * (level / 5 + 1)

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Level/Coal Burn Seconds/Blaze Rod Burn Seconds/Lava Bucket Burn Seconds

0/80/120/1000

1/96/144/1200

2/112/168/1400

3/128/192/1600