Multiblock

A Multiblock is a machine built from more than one block. This can be as little as two for the smallest of the Railcraft Boilers, or hundreds of blocks for end game superstructures. Multiblocks almost always use more than one type of block in their construction, though there are a few exceptions such as the Water Tank. Builds have a set of design limitations; a specific size and placement in order to be a valid structure. Some are flexible or can be configured in multiple variations, while others can only be put together one way. Gregtech makes heavy use of multiblock structures and has sets of tiered blocks that are common to many such machines.

Input Bus
The Input Bus is for supplying solid items and setting a control circuit or ghost circuit. Fluids and gasses cannot be supplied via cells/buckets/containers in the Input Bus; these ingredients need to go in the Input Hatch.

Input Hatch
Liquids and gasses must go into the Input Hatch's tank. The Input Hatch can hold a reserve of fluid cells and will automatically empty them as it drains, capacity permitting. It cannot empty cells that have more fluid in them than it can hold at once.

Output Bus
The Output Bus is where finished items will be deposited after processing. If a valid inventory is placed adjacent to the Output Bus's output face (dark grey square with orange triangles), it will automatically push items into the inventory, no Conveyor needed. Otherwise items will accumulate in the Output Bus until emptied. If the Output Bus is full, the EBF will continue to work and destroy any new outputs. Ensure there is sufficient inventory space or the bus to empty at all times. It checks each slot of an inventory so later on this may produce some lag.

Output Hatch
The Output Hatch is optional and will collect waste gasses for some recipes (C02/CO/SO2), mostly ore dusts. The amount collected is based on the tier of the Muffler Hatch and at LV it will get nothing (0%); a MV Muffler recovers 13% of the possible total. The quantities shown in NEI are for the 'best' Output Hatch (UHV).

Muffler Hatch
The Muffler Hatch gives a bonus reduction to pollution output and determines the percentage of waste gas recovered for some recipes. By default an LV Muffler Hatch has no reduction or gas recovery, but is still required to successfully form the multiblock. A Portable Scanner will show the current pollution reduction afforded by the Muffler, or look at the tooltip in NEI.

Maintenance Hatch
The Maintenance Hatch is where any Maintenance issues need to be addressed. There are no tiers for this block.

Energy Hatch
Each Energy Hatch accepts up to 2A of its tier. Since even the most basic EBF recipes require 120 EU/t, it needs to be supplied with 4A of LV to reach MV energy tier. If there's even a single maintenance issue, the EBF can still run but will need three LV Energy Hatches accepting a total of 5A of LV power. Fixing any maintenance issues promptly is far less costly in the long run.

Heating Coils
Coils determine what recipes the EBF can do, and how well it does them. Some recipes will require more heat than Cupronickel coils provide. For instance, Energetic Alloy requires 2200K, while Cupronickel Coils only provide 1800K- thus, a EBF cannot smelt Energetic Alloy until its coils are upgraded. An EBF or group of wallsharing EBF's can only have one coil type.