HEPA (High Efficiency Particulate Air ,Absorber or Arresting)


HEPA is term which refers to  Manufactured, Tested and Certified by Institute of Environmental science and technology an construction under article published in IEST RP-CC001.3.

HEPA Is High efficiency particulate arrestor.

Hepa Filters are used to capturde up to .3 Micron particles from the air. Means The particles which are 300 times Thinner then Human hair.

History Of HEPA Filters:

Initially Hepa Filters were designed to  capture radioactive particles from the air while world war II. It was design and developed by Arthur D. Little under “Manhattan Project”. It was commercialized in 1950 and the original term became the trademark and Generic term for high efficiency filter. Over the decades its evolved to satisfies Higher demands of air quality in various Industries such as Aerospace, Pharmaceutical Drug Processing, Hospitals, Health care, Nuclear Fuels, Nuclear Power and Integrated Circuit fabrications.

Why HEPA filters are so efficient?

Its Made of Ultra Fine Glass Material to capture microscopic air borne particles which might not capture by any other filters. To Qualify A type HEPA filter it must capture 99.997% (capture up to 9,997 out of 10000) of particles .3 Microns.

Does HEPA filter Efficiency decrease when it gets Dirty?

No, Unlike they got more effective. In fact, the dirtier Hepa filter is more efficient. you can use hepa filters until its block or chocked.

Why Select HEPA with Activated Carbon Filter while purchasing Air Purifier?

Hepa Filter has its limitation as it can not capture Harmful gases, VOC and Foul smell. Activated carbon filter absorbs all these impurities from the air. So HEPA + Activated carbon filters can remove almost most of the impurities from the air. which you commonly found in household.

The terms which were untold by Air Purifier Manufactures?

Kindly check the class of HEPA filter while purchasing HEPA based Air purifier

The specification usually used in the European Union is the European Norm EN 1822:2009. It defines several classes of HEPA filters by their retention at the given most penetrating particle size (MPPS):

HEPA classretention (total)retention (local)
E10> 85%
E11> 95%
E12> 99.5%
H13> 99.95%> 99.75%
H14> 99.995%> 99.975%
U15> 99.9995%> 99.9975%
U16> 99.99995%> 99.99975%
U17> 99.999995%> 99.9999%

Today, a HEPA filter rating is applicable to any highly efficient air filter that can attain the same filter efficiency performance standards as a minimum and is equivalent to the more recent NIOSH N100 rating for respirator filters. The United States Department of Energy (DOE) has specific requirements for HEPA filters in DOE regulated applications. In addition, companies have begun using a marketing term known as “True HEPA” to give consumers assurance that their air filters are indeed certified to meet the HEPA standard.

Products that claim to be “HEPA-type”, “HEPA-like”, “HEPA-style” or “99% HEPA” do not satisfy these requirements and may not have been tested in independent laboratories. Some of these sub-par quality filters may come reasonably close to HEPA filtration, while others will fall significantly short, making them truly inferior.

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