Rectification Section is a passive upgrade block for the Distillation Column, the first multiblock machine of the Ala Industrial mod for Minecraft 26.2. Place the section directly on top of an assembled three-block tower and the column grows to four blocks: every distillation of 1000 mB of crude oil then returns 750 mB of diesel and 200 mB of fuel oil instead of 700 mB and 200 mB. Those extra 50 mB of diesel per operation cut fractionation losses from 10% to 5%, which lifts the net energy of a bucket of oil from 8,200 EU to 8,800 EU once pumping and the flat 400 EU distillation cost are paid. The section has no ports and no menu of its own — it is a purely structural block that the column recognizes the moment it appears on the summit.

Rectification Section is crafted from four Iron Plates and four Copper Plates laid out as an alternating frame around an empty centre, and it works identically on Fabric and NeoForge. The block drops itself when broken, so the upgrade can be moved to another tower at any time: remove the Rectification Section and the column simply returns to its base 700 mB yield without stopping. Energy still arrives only through the base at 2 EU/t, a cold column still warms up for 200 ticks (about 10 seconds), and the working steam moves up to the section itself, so a running refinery is readable from afar. In a continuous oil loop the extra diesel costs not a single extra EU, which makes the Rectification Section one of the cleanest efficiency upgrades of the LV tier.