air fan filter

Although HEPA filters have become commonplace in clean rooms, ULPA filters are also used to maintain an even purer level of air cleanliness.  ULPA is an acronym for Ultra Low Particulate Air, and can stop particles with 99.999% efficiency.  This efficiency level applies to particles that are .12 microns or larger, and the ULPA filters work great for rooms that need that extra level of cleanliness.  ULPA filters are generally used in Class 10 cleanrooms and cleaner.