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The effectiveness of Respiray’s wearable air purifier and UV-C technology.
The effectiveness of Respiray’s air purifier has been tested in the independent laboratories of the University of Tartu in Estonia, the University of Lodz in Poland, and in the world-renowned testing laboratory SGS. In the University of Lodz test, our patent-pending disinfection module achieved 99.68% and 99.88% reduction against E.coli and S.aureus bacteria respectively at 30 l/min throughputs. Plus, in the University of Tartu study, we achieved 99.4% and 99,2% effectiveness at inactivating Alphavirus and Influenza A virus.
The device itself has also been tested at the world’s leading testing, inspection and certification company SGS. SGS has been recognised as the global benchmark for quality and integrity. These tests showed that Respiray’s device protects the wearer more effectively than a cloth and surgical face masks.
The UV-C disinfection module of our device was tested in the Laboratory of the Department of Environmental Biotechnology at Lodz University of Technology (Poland) to assess the effectiveness of bioaerosol disinfection at conditions of bacterial filtration efficiency (BFE) test of the EN14683 standard.
The tests were conducted using Staphylococcus aureus and Escherichia coli. The test results showed 99.68% and 99.88% efficiency in reducing the amount of S.aureus and E.coli or about 2.50 and 2.95 Log reduction respectively.
The UV-C module was also tested at the University of Tartu with Alphavirus and Influenza A virus. Both viruses, like the SARS-CoV-2, are membrane single-stranded RNA viruses with a size of 70-120 nanometers used in this testing method.
The number of Alphavirus particles capable of infection was reduced 99.4% when 10,000,00 virus particles were passed through the Respiray UV-C module compared with the control device. The Influenza A virus was reduced by 99.2%
Respiray’s Wearable Air Purifier was tested in SGS Laboratory against E. Coli where test results showed that the device protects the wearer 82% without the face shield and 89% with the face shield. From research, E.Coli responds very similarly to UV-C light compared to SARS-CoV-2. It means that the device is more efficient than a surgical mask and equal to an FFP2 mask.
Test results were performed by GB: 21551.3-2010 standard method for assessing the reduction rate of culturable airborne bacteria by air purifiers using a test chamber.
Our scientists and engineers have put together a white paper to show UV-C light’s effectiveness in inactivating airborne pathogens.
This white paper addresses the issues with current personal airborne pathogen protection (PAPP) methods and describes a new wearable device with UV-C light disinfection for PAPP. The device uses UV-C light at wavelengths around 265 nm, reaching peak efficiency of pathogen inactivation. The main causes of pathogen inactivation using UV-C are mutations in genetic code that lead to a loss of reproductive ability. Our personal device reduces the infectivity of airborne pathogens in breathable air, allowing the immune system to prepare a better response against the active species. The paper also refutes claims of hazardous ozone emissions during UV-C disinfection and shows that at the utilised wavelength, ozone destruction takes place instead.
UV-C light is a reliable and effective way to inactivate bacteria, viruses and other harmful microorganisms. Its germicidal properties have been known for over 100 years, but this is the first time it’s been built into a wearable air purifier.
In recent years, there have been significant technological advancements in UV-C LEDs (265nm). LEDs are now low maintenance, reliable and non-ozone producing thanks to breakthroughs in UV-C technology.
Germicidal UV-C radiation at around 265 nm inactivates pathogens by causing changes in their genetic code and causing a loss of ability to replicate. This provides a superior method of disinfection. Although legacy mercury UV-C lamps previously caused ozone to form, newer LEDs destroy ozone instead. Our engineering solution is based on a spiral-shaped reflective air chamber which increases the irradiation efficiency of airborne pathogens passing through it. This results in higher UV doses received and, therefore, higher inactivation rates.
More general questions about the Respiray air purifier can be found here.
Please note: our device is not medical-grade Personal Protective Equipment (PPE) and in circumstances where medical-grade Personal Protective Equipment is recommended, you should consult a healthcare professional.
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