Understanding air filtration and UV disinfection in a medical environment

Health Europa reports on why UV purification is the most effective air disinfection method for medical, commercial and residential environments.

Evidence has accumulated over the years that following the standard guidelines and codes for designing healthcare facility ventilation systems is far from sufficient to ensure a sterile environment. Sterility is generally defined as 6 log (99.9999%) reduction of a population of microorganisms. This means that as little as one microorganism in a million is expected to survive after disinfection.

Traditional air filtration with high-efficiency particulate air (HEPA) filters or ultra-low penetration air (ULPA) filters have been widely adopted in the ventilation systems of hospitals, labs, and clinics, to control airborne pathogens. However, multiple studies have demonstrated that despite the use of such high-end filters, viral and bacterial airborne contamination are still ubiquitous in these ventilation systems. 

The most common explanation for underperforming filters often points to the filter rack seal joint’s bypass, filter puncture leakage, and poor general installation or maintenance. Although all these points remain valid and can always be improved, the physical cause is rooted in the fundamental fact that all filters show a significant drop in their capture efficiency for a certain range of particulate sizes – these can include both particles which are too small to be captured by interception and impaction and those which are too large to be removed via electrostatic and diffusion. This is simply a straightforward consequence of the fundamental principles of filtration physics. […]

Read more on Health Europe website.

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Using Sanuvox UVC technology to reduce the propagation of SARS-CoV-2 virus

Using Sanuvox UVC technology to reduce the propagation of SARS-CoV-2 virus

  • UVC irradiation (254 nm) is known for its germicidal properties. By disrupting their nucleic acids (DNA/RNA), it inactivates the reproductive capability of biological pathogens (molds, viruses, bacteria).1, 2

  • Sanuvox in-duct units have been demonstrated to be up to 99,97% effective at inactivating viruses and bacteria in the air in a study conducted by the EPA and Homeland Security 3. Bacteria and virus tested in the study (B.atrophaeus, S.marescens, MS2) are known to be more resistant to UVC than SARS-CoV-2 virus. 4,5
  • Many engineering and health agencies (ASHRAE, REHVA, CDC) now recognize that airborne transmission plays a major role in the propagation of SARS-CoV-2, the virus responsible for COVID-19. These agencies also recommend using UVGI as an effective method to mitigate the spread of the virus in indoor spaces. 6, 7, 8, 9
  • Because Sanuvox units are specified according to HVAC systems parameters, adequate UV output power is calculated using our proprietary software. As such, patented Biowall units can achieve the recommended 99% disinfection per pass regardless of air velocity.

1 https://www.fda.gov/medical-devices/coronavirus-covid-19-and-medical-devices/uv-lights-and-lamps-ultraviolet-c-radiation-disinfection-and-coronavirus

2 https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2789813/

3 https://cfpub.epa.gov/si/si_public_record_report.cfm?Lab=NHSRC&address=nhsrc/&dirEntryId=154947


5 https://www.researchgate.net/publication/339887436_2020_COVID-19_Coronavirus_Ultraviolet_Susceptibility


7 https://www.cdc.gov/coronavirus/2019-ncov/science/science-briefs/scientific-brief-sars-cov-2.html


9 https://www.ashrae.org/technical-resources/filtration-disinfection

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Sanuvox UV air purifiers capabilities against viruses

Sanuvox UV air purifiers capabilities against viruses

Sanuvox corporation, a North American leader in UV disinfection of air and surfaces, would like to warn people tempted to purchase air purifiers or other devices against potential claims that would find themselves misleading.

UV air purifiers installed in the HVAC system, with an adequate germicidal dosage sized for the air flow, will destroy airborne viruses, but cannot guarantee anyone from becoming infected.

Air purifiers inside HVAC cannot disinfect frequently touched surfaces such as door handles and light switches, which are common disease transmission path. So good hygiene practice and frequent wash of hands continue to be the safest way to protect ourselves against any airborne or surface contaminants that can be introduced by other occupants and dispersed by the HVAC system in the house.

In other words, a powerful UVC air purifier can reduce the possibility of spreading the contaminants through the HVAC system, but it does not eliminate the necessity of safe hygiene practices.

Because the susceptibility to germicidal UV of any microorganism is determined by its genome sequence, the germicidal UV dose required to kill the CoVid-19 is practically the same as for the SARS-CoV (2003) within less than 1.6% variance.

For additional technical information regarding Covid-19, please visit https://bit.ly/38t12Mo.

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