Newsletter Issue 27

Compare to HEPA, is there a better indoor air clean technology? MESP!

Fon Zhou | Sep 26, 2021

What's HEPA?

High-efficiency particulate air (HEPA), also known as high-efficiency particulate absorbing and high-efficiency particulate arrestance. 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% (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.

What's MESP?

MESP® stands for Micro-electrostatic Precipitator. It is highly efficient at removing airborne particles like PM2.5, fungus, dust, pollen, soot, smoke and powerfully deactivates viruses and bacteria. In the MESP system, airborne particles in propelled air flow are electrically charged before passing into honeycomb shaped filter. The filter is formed by layers or rows of tubes and each row contains thin electrode sheets with insulation coating that generate intense electrical fields within the tubes. Charged particles - pollutants, bacteria, germs, viruses - are pulled to the walls of the tubes - and firmly stick.

Air Sterilization Function

HEPA Is NOT Designed For Sterilization.
1. Viruses always adhere to airborne particles and droplets. The HEPA filter can capture some viruses by attracting particulate matter. However, we have not seen experimental data to prove the efficiency of HEPA to capture viruses.
2. The viruses captured by HEPA filter is active, so there are two risks as following:-It perhaps blown out by the airstream to re-contaminate the indoor environment, especially if the filter is overloaded.
-There is the risk of virus infection for the operator when replacing the filter.

MESP Air Purifiers Are Perfect Air Sterilizers.
MESP system can capture fine particles as small as 0.01μm. It‘s highly effective at capturing and trapping microbes such as germs, bacteria, viruses, mold, etc. Meanwhile MESP system will definitely kill those harmful microorganisms with high voltage (over 10KV) strong electrostatic field. Safe and controllable!
An independent U.S. research laboratory conducted the research study by introducing the SARS-CoV-2 USA-CA1/2020 pathogen to an AQT air purifier built with MESP technology. The test result showed a significant reduction of pathogen at the downstream collection point and achieved a 99.99% SARS-CoV-2 sterilization rate. SARS-CoV-2 is the virus that causes COVID-19. A copy of the test report is available here.

Technical Comparison

Purification Efficiency Excellent Excellent +
0.3 μm particle capture: 99.97%
Smallest particle capture: no data
0.3 μm particle capture: up to 99.99%
Smallest particle capture: 0.01 μm
Air Sterilization None Excellent +
Just capture but not kill Up to 99.99%
Pressure Drop
Poor >Excellent
0.6 - 1.2” wg (150-350 pascals) >0.04-0.2” wg (10-50 pascals)
Energy Cost Poor Excellent
Significantly more energy due to high pressure drop Air easily passes through the filters
Maintenance Cost Poor Excellent
Final and/or pre-filters require frequent replacement/disposal. Occasional cleaning takes only minutes.
Service Life Poor Excellent
Loads quickly unless configured with substantial pre-filtration. Properly maintained MESP filter is permanent: Never needs replacing.
Noise Poor Excellent
High pressure drop = high noise Low pressure drop = quiet air flow
Adapt to high humidity environment Poor Excellent
Noramlly not exceed 70% Up to 95%
Fire prevention Poor Good
Inflammable Non-flammable

Please be noted, medical grade HEPA (with very high standard) can achieve super high efficiency like 99.9999%. They are not normal HEPA products and much more expensive, and need to be replaced more frequently.

For more information, please don’t hesitate to contact your sales representative in AQT, or directly send e-mail with your query to Or you can find more info on our website:

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