Electric Air Filter

The Electric Air Filter (EAF) is an LV tier multiblock for scrubbing pollution from nearby chunks. The EAF is available in three tiers to further increase its range, speed, and efficiency at the cost of power. Insert any size turbine into the controller and add up to eight muffler hatches to the structure. The amount of pollution scrubbed every second depends on the tier of the machine, the efficiency of the turbine, and the tier/amount of muffler hatches. Optionally, supply absorption filters through an input bus to double the amount of pollution scrubbed per second. Absorption filters last 300 seconds each and recycle back into their original casing along with a few additional resources. There is also the singleblock pollution scrubber which is not as efficient or fast as the EAF, but can help supplement it.

If left unchecked, pollution can cause serious negative effects such as debuffing the player, destroying plant life, and eroding terrain. Pollution dissipates naturally over time, but not enough to counteract a rising industrial complex. The following are a few extra tips to help preserve the natural environment.

• Use high tier muffler hatches and/or advanced muffler hatches.
• Use clean energy sources such as steam instead of combustible fuels.
• Spread machines out across multiple chunks or even across dimensions.
• Disable pollution in .minecraft\config\GregTech\Pollution.cfg.

Spreadsheet: EAF Calculator

The EAF is available in three tiers but the only structural difference between them is the type of casings and the controller itself. Buses/hatches may replace any bottom casing except for the muffler hatches which replace any center side casing. The tier of the energy hatch determines the maximum tier of the muffler hatches and the tier/amount of muffler hatches determines the amount of pollution scrubbed every second. Multi-amp and laser energy hatches are not supported, but a single regular energy hatch is usually enough anyway. Use the Multiblock Structure Hologram Projector to visualize/build the structure.

Structure

• Controller: Front bottom center
• 9-22 Air Filter Turbine Casing^[1]
• 8 Air Filter Vent Casing^[1]
• 1+ Energy Hatch: Any bottom casing
• 1 Maintenance Hatch: Any bottom casing
• 1-8 Muffler Hatch: Any center side casing
• 0+ Input Bus: Any bottom casing
• 0+ Output Bus: Any bottom casing
• Mandatory Air: Interior of the structure

Wallsharing

EAFs may wallshare each of their sides to save on casings and buses/hatches. That includes the muffler hatches since the interior of the structure is hollow, and the energy hatches since the power consumption is fixed. For example, one LV energy hatch can pull up to 64 EU/t (2A LV) to support two T1 EAFs consuming 30 EU/t each.

The EAF scrubs pollution from nearby chunks every second while active. The only requirement is power and a turbine inside the controller. Higher tiers have a larger working area and consume more power, as seen in the following table. They also receive a higher tier bonus (${\displaystyle {\displaystyle {\text{B}}}}$) which multiplies the amount of pollution scrubbed per second. The working area can be reduced by sneak right-clicking the controller with a screwdriver, but that does not reduce its total power consumption. The EAF also does not overclock so these are fixed values regardless of the tier of the energy hatch.

The EAF has two operating modes, listed below. Switch modes by right-clicking the controller with a screwdriver. They both spend one second on each chunk before moving onto the next, but random mode is significantly more effective because it does not waste time on chunks without pollution.

• Normal Mode - Always selects the next chunk in the sequence within the working area.
• Random Mode - Randomly selects a polluted chunk within the working area.

The EAF requires a turbine inside its controller to run. The turbine can be any size or material and the only stats that matter are its durability and base efficiency. On average, turbines lose 0.5 durability every 10 seconds while operating on polluted chunks, regardless of the tier of the machine or the amount of pollution scrubbed. Turbines do not lose durability on chunks without pollution. That means a turbine with as little as 25,600 durability can still last upwards of 142 hours at maximum runtime. The efficiency of the turbine multiplies the amount of pollution scrubbed per second. The following table lists some popular early-game options for turbine materials. See the Large Steam Turbine page and/or the GTNH Power Planner for more.

The amount of pollution scrubbed every second depends on the structure tier bonus (${\displaystyle {\displaystyle {\text{B}}}}$), the efficiency of the turbine (${\displaystyle {\displaystyle \eta }}$), and the tier (${\displaystyle {\displaystyle {\text{T}}}}$) of the muffler hatches, as seen in the following equation. There is a summation because muffler hatches do not all need to be the same tier, there can be anywhere between 1-8 of them, and they contribute independently from one another. The floor operator simply rounds down decimal values to the nearest integer. The resulting gibbl/s only applies to the single chunk that the EAF is currently operating on before moving onto the next. Right-click the controller with a Portable Scanner to verify the pollution reduction in gibbl/t.

${\displaystyle {\displaystyle {\text{-gibbl/s}}=30{\text{B}}\times \eta \times \sum \lfloor 2.5^{\text{T}}\rfloor }}$

The following table lists the corresponding tier value for each type of muffler hatch. Advanced muffler hatches also work, but they are significantly more expensive to craft without any additional benefit to the EAF.

Optionally, supply absorption filters through an input bus to double the amount of pollution scrubbed per second. Absorption filters have 30 durability and lose 1 durability every 10 seconds while the machine is active, regardless if there is pollution in a chunk or not. After 300 seconds, the EAF outputs a dirty absorption filter which can be recycled for a chance at its casing back, carbon, dark ashes, and liquid pollution. The liquid pollution can then be distilled in a Distillation Tower for mercury, methane, nitrogen dioxide, sulfuric acid, and ashes. Right-click the controller with a Portable Scanner to check if an absorption filter is active and how many 10 second cycles are left before it expires.

The following tables summarize the effectiveness (-gibbl/s) of each machine tier with 8 identical muffler hatches and various turbine efficiencies. Multiply these values by two if using absorption filters. Use the calculator linked at the top for custom calculations.