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HEPA Filtration Definition

HEPA (high-efficiency particulate air) filtration systems use filters to remove airborne particles from air. HEPA filtration systems can be found in air purifiers, vent filters and vacuums. HEPA filtration systems can be loud because of the air being circulated and forced through the filters. Once the air is processed through a HEPA filtration system, the air becomes purified and free of particulate contaminants.

  1. HEPA History

    • According to the Environmental Doctor, HEPA filtration was invented during World War II. The Atomic Energy Commission was trying to engineer a product that could absorb radioactive materials emitted in the air caused by industrialization. HEPA filtration must reach specific guidelines to conform to quality measures.

    Microns

    • HEPA filters are made to catch up to 99.97 percent of airborne particles, according to Abatement Technologies. In other words, HEPA filters catch 9,997 of particles (out of 10,000) at a size of 0.3 microns. A micron is one millionth of a meter, or rather a micrometer. To put it in perspective, the capability of a HEPA filter would be like watching a piece of cotton getting trapped by a mesh screen. Because of the efficiency of HEPA filtration, it can catch many known harmful agents that can cause illnesses in humans.

    HEPA Uses

    • Hospitals use HEPA filtration.

      HEPA air purifiers and vent filters can be used to allergen-proof your home. HEPA filters within vacuums can be used to remove dust, dander, debris and other particles. Hospitals and laboratories also use HEPA filtration to remove bacteria and airborne contaminants from medical facilities.

    HEPA-Type

    • There is a misconception that HEPA-type filters are the same as HEPA filters. HEPA-type filters only process about 55 percent of particles that process through a HEPA-type filter. This means 5,500 micron particles out of 10,000 will slip through a HEPA-type filter.

    HEPA Durability

    • Unlike many HEPA-type filters, a true HEPA filter will never lose its filtration efficiency. Products containing similar air purification techniques will not perform as well as HEPA filtration. Other air purification technologies, such as HEPA-Type filters will lose their efficiency as they become dirty. True HEPA filters will filter better as they get dirtier.

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