With this block you can melt up to 3 items at the same time and have more 6 items waiting for its time to cook.

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As you can see at the screen above, the raw chicken , raw beef and iron ore are cooking at the same time. When the 29 raw chicken be empty, furnace will pick next item (raw porkchop), and put it to cook (always respecting the same line of items).

This furnace do not cook items quickly, it cooks at the same velocity as normal furnace, but the difference is that it can cook 3 items at the same time.

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This furnace supports automation. This mean that you can put a chest and a hopper on input side and a hopper and a chest on output side of the furnace!  This is great!