What is Hepa


HEPA, high-efficiency particulate air filter, also known as high-efficiency particulate absorbing filter and high-efficiency particulate arrestance filter, is an efficiency standard of air filter.

HEPA filter - source: Wikipedia

Filters meeting the HEPA standard must satisfy certain levels of efficiency. Common standards require that a HEPA air filter must remove—from the air that passes through—at least 99.95% (ISO, European Standard) or 99.97% (ASME, U.S. DOE) of particles whose diameter is equal to 0.3 μm, with the filtration efficiency increasing for particle diameters both less than and greater than 0.3 μm.

HEPA filters capture pollen, dirt, dust, moisture, bacteria (0.2-2.0 μm), virus (0.02-0.3 μm), and submicron liquid aerosol (0.02-0.5 μm). Some microorganisms, for example, Aspergillus niger, Penicillium citrinum, Staphylococcus epidermidis, and Bacillus subtilis are captured by HEPA filters with photocatalytic oxidation (PCO). HEPA is also able to capture some viruses and bacteria which are ≤0.3 μm. HEPA is also able to capture floor dust which contains Bacteroidia, Clostridia, and Bacilli.

HEPA was commercialized in the 1950s, and the original term became a registered trademark and later a generic trademark for highly efficient filters. HEPA filters are used in applications that require contamination control, such as the manufacturing of hard disk drives, medical devices, semiconductors, nuclear, food and pharmaceutical products, as well as in hospitals,[15] homes, and vehicles.

Option for the Guardian

The high capacity air filter is one of the add-ons of the Guardian line of desiccant breathers with a true HEPA filtration.

High capacity air filterThe GUARDIAN  High Capacity Air Filter


  • High particle load holding capacity
  • True HEPA filtration
  • Ideal for dusty environments
  • Helps prevent bacterial contamination of fluids
  • Blocks particles down to 1/3 of a micron

The air filter connects to the Guardian with a modular stackable ring. The HIGH-CAPACITY AIR FILTER can be used with a desiccant cartridge or as a standalone particle filter. The High-Capacity Air Filters’ 0.3-micron HEPA filter is 99.97% efficient. Ideal for extremely dirty/dusty environments.