What is HEPA filter ?
HEPA(High Efficiency Particulate Air)Filter is a throwaway, extended-media, dry type filter with a rigid casing enclosing the full depth of the pleats. The filter should perform efficiency of 99.97% filtration when tested at an aeresol diameter of 0.3 micronmeters aerodynamic diameter. HEPA filters are commonly used filtering exhaust air of vacuum machines not in vacuum bags. Some of vacuum bags carry the word -HEPA -on their package, but the bag itself is not a HEPA filter. Some of micro filtering quality vacuum bags filter as fine as HEPA filters.