PCO Whitepapers

Photocatalytic Oxidation Air Purification Systems.

Whitepaper Clip - PCO Air Purification
Photocatalytic titanium apatite filter (PTAF) is a new material that has been reported to have an ability to absorb and inactivate bacteria. The inactivation effect of PTAF on serious acute respiratory syndrome coronary virus (SARS-CoV) was tested. The results showed that PTAF filter inactivated/ decomposed SARS CoV up to 99.99% after 6 h interaction under the condition of non-UV irradiation. However, under the condition of UV irradiation, PTAF and HAF both were able to inactivate/decompose SARS CoV completely. The study has provided the first evidences that PTAF could inactivate SARS-CoV virus, suggesting that the PTAF material will be applied for the prevention of SARS-CoV as well as other viruses.
Cite: Han, W., Zhang, P. H., Cao, W. C., Yang, D. L., Taira, S., Okamoto, Y., Arai, J. I., & Yan, X. Y. (2004). The inactivation effect of photocatalytic titanium apatite filter on SARS virus. Progress in Biochemistry and Biophysics, 31(11).
PCO Covid Reponse - ASIET Air Purification
URL Ref:
1.) https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7079867/
2.) https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7079867/#CR87
3.) https://scholar.google.com/scholar_lookup?journal=Prog+Biochem+Biophys&title=The+inactivation+effect+of+photocatalytic+titanium+apatite+filter+on+SARS+virus&author=W+Han&author=PH+Zhang&author=WC+Cao&author=DL+Yang&author=S+Taira&volume=31&issue=11&publication_year=2004&pages=982-985&
4.) https://covid19.elsevierpure.com/en/publications/the-inactivation-effect-of-photocatalytic-titanium-apatite-filter

ASIET Air Whitepaper

ASIET Air Purification Whitepapers

  1. Introduction

Many businesses, homes and schools work in a closed environment where Indoor Air Quality (IAQ) affects its employees, family and stakeholders.  The Environment Protection Agency (EPA) has identified that 90% of  an individual’s time is spent indoors and the indoor air is two to five times more polluted than outdoor air.  These pollutants have negative impact on health after repeated exposure, which might include irritation of the eyes, nose, throat, headache, dizziness and fatigue.  However, individuals react differently to the exposure of indoor-air pollutants according to the EPA.


Given the above IAQ issues it is significant to recognize and address them for the health and safety of all who enter an indoor-air environment.  Several buildings, constructed many years ago, have issues with mold, viruses, and Volatile Organic Compounds (VOC’s).  Even newly constructed buildings can have similar issues due to chemicals and construction methods.


     2. What to Do?

Often the decision is to use high-efficiency particulate (HEPA) filters to purify the air, which trap harmful particles such as pollen, pet dander, dust mites and tobacco smoke. HEPA filtration catches down to 0.3 Microns of particulate matter, as it cleans the air.


ASIET Air equipment's employ UV-C germicidal lamps and Photocatalytic Oxidation (PCO) processes through a “Technosite™” impregnated reactor, which is more effective than UV lights alone. ASIET equipment catches down to 0.001 microns of particulate matter, as they clean the air. 


ASIET equipment is environment friendly for emitting small quantities of Ozone. ASIET emissions are below the federally allowed emission levels, making them environmentally safe. This allows individuals to stay in buildings while the air is cleared of pollutants. 


     3. How do we do it?

As virus, bacteria, organic matter and VOC enter the reactor pad, equipped with UV-C lamps, an HO-radical activity destroys the pollutants, leaving the indoor-air 99.999% pure.  The byproduct of this HO-radical activity is a 0.02% hydrogen-peroxide air that helps clean surfaces, which include the coils in air handler units, ducts and surfaces within the building.


By ensuring 99.999% clean air in the indoor environment, the pollutants  (viruses, bacteria and VOCs) are destroyed. It adds further benefits by improving efficiencies of the air ventilation system employed in the building. 


ASIET offers a choice of portable, hangable, and inside-the-air-handler-installation equipment  for comprehensive air purification within buildings. ASIET equipment have a long life span and last for years with minimal maintenance costs. The UV-C lamps require replacement annually and the “Technosite™” reactors can last for years with simple cleaning and reinstalling.


If replacement UV-C bulbs are purchased through ASIET the parts warranty is extended an additional year. 


     4. Conclusion

By continually cleaning the indoor air, ASIET  equipment increases air movement. The equipment maintains clean air that can, over time, save energy costs and create an effective and efficient air-delivery system.