The Cleanroom Air Filter is a block added by RedLogic. It is an optional block for the Cleanroom structure that compensates for missing blocks in its construction at a 4:1::Filter:Air ratio. For example: the cleanroom in Fig. 1 has an entrance with 2 air blocks (right side), which must be compensated with 8 Cleanroom Air Filters (on the ceiling). Blocks which are intended for the construction don't have to be compensated (see also: Cleanroom).
