Discuss OronD's answer to: Do you use HEPA filters on your vacuum cleaners?

HEPA filters are built to eliminate (avoid) 99.97% of all particales above 0.3 micrometer (that is the definition of the USA ministry of Energy).  In normal home vacuum cleaners it is enough to have "fine dust filters" (a grade one level above [ = a bit  coarser] than HEPA).  So most of the home vacuum cleaners do not have HEPA filters.