HEPA Filters  

HEPA Filters


HEPA Filter History and Specifications

replacing a hepa filter in a vacuum cleaner
hepa filter HEPA stands for High Efficiency Particulate Air (filter).  HEPA was a top-secret technology developed during the 1940s by the United States Atomic Energy Commission to efficiently filter radioactive particulate contaminants.  HEPA is a type of highly efficient filtration media that removes microscopic particles from air that passes through the filter.  There are different efficiency ranges depending on particle size.  The most efficient HEPA filter removes 99.7% of particles with a size of 0.3 microns that enter the filter.  Such particles include tobacco smoke, household dust, and pollen.  HEPA filters are most commonly found in household vacuum cleaners and air filters.  Depending on their usage and indoor air quality factors, it is suggested that HEPA filters be replaced every 12 to 18 months.

hepa filter detail ULPA filters, or "Ultra-HEPA" filters, are designed to trap 99.999% of all airborne particles with a size of 0.3 microns from the air that passes through the filter.  These filters are sometimes used in laboratory and industrial applications such as cleanrooms.

Consumers can select air filters by looking at their efficiency in removing airborne particles from the air stream that passes through them.  For an air filter installed in HVAC system ductwork, this efficiency is measured by its Minimum Efficiency Reporting Value, or "MERV."  This measurement technique, developed by the American Society of Heating, Refrigerating and Air Conditioning Engineers (ASHRAE), allows the efficiencies of air filters supplied by different vendors to be compared.

True HEPA filters have MERV ratings between 17 and 20; high-efficiency filters have MERV ratings ranging from 14 to 16; and medium-efficiency filters have MERVs ranging from 5 to 13.  Most residential HVAC systems do not have sufficient fan or motor capacity to accommodate true HEPA filters.  However, air filters with MERV ratings between 7 and 13 may be nearly as effective as true HEPA filters in filtering most indoor airborne particles.  Check out this EPA guide to residential air cleaners for more information about air cleaners and air filters in the home.

What is a Micron?

The size of airborne particles that air purifiers capture are measured in microns, which are approximately 1/25,400 inch or 100 times smaller than the diameter of a human hair.  Particles 1 micron in diameter are not visible to the naked eye.

What is Microban?

Microban is an antimicrobial agent that is used to treat the HEPA filter.  Microban product protection helps inhibit growth of odor-causing bacteria, mold, and mildew on the filter surface.  Microban does not affect the life of the filter.

What is an Air Purifier?

Air purifiers filter dust, smoke, pollen, pet dander, mold spores, and other airborne particles as small as 0.3 microns in diameter.  An air purifier functions by drawing dirty air through an inlet grill, trapping particulates, and exhausting cleaner, filtered air.  Some units have a washable pre-filter that traps larger airborne particles.  Air then passes through a carbon filter, which captures larger particles and helps to reduce odors.  The air then passes through a HEPA filter made of tightly woven fibers.  Some units have electronic ionizers that further assist in particle removal.  The fan then redistributes the filtered air throughout the room.

HEPA Vacuum Cleaner Filters

  • AllergyBeGone offers a selection of HEPA vacuum cleaner filters and accessories from selected HEPA filter suppliers.  Featured listing.

HEPA Air Filter Manufacturers

  • Holmes Products
    Develops and manufactures home environment products including HEPA filters and accessories.
  • Parker Hannefin
    Manufactures and distributes industrial, institutional, and residential air filtration products.
  • HEPA Filters
    This Pennsylvania-based firm offers HEPA air filtration products for home, office, and medical air purification applications.  They specialize in air filters for cleanrooms.

Related Air Filtering and Air Conditioning Resources

  • Air Cleaners - some household air filters include HEPA filtration.
  • Air Conditioning - central air systems may feature electronic air cleaners.

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