Minecraft wiki entry for Block_entity_format, associated text: : The block entity's root tag.
 BurnTime: Number of ticks left before the current fuel runs out.
 CookTime: Number of ticks the item has been smelting for. The item finishes smelting when this value reaches 200 (10 seconds). Is reset to 0 if BurnTime reaches 0.[needs testing]
 BurnDuration: The total time that in ticks that the currently used fuel can burn.
 StoredXPInt: The number of experiences it stores.
 Items: List of items in this container.
: An item in the furnace, including the slot tag.
 Slot: The inventory slot the item is in.
Tags common to item stack[show]