The Science

The use of UV-C as a method for disabling micro-organisms, was discovered in the late 19th century. Around that time, Niels Finsen, a Danish physician, created a UV-C emitting lamp, to successfully treat tuberculosis. This discovery earned him the 1903 Nobel Prize for Medicine and Physiology.  Since then, many scientific and engineering papers have been published on the sensitivity of various micro-organisms to UV-C and its germicidal effectiveness.
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Background in UV

UV light can inactivate microbes in air, on surfaces and in water or other liquids. The degree of UV disinfection is governed by degree of UV exposure of the target microbe. Furthermore, the wavelength of that UV radiation and the microbe itself will impact the overall inactivation.

The use of UV-C (254nm wavelength) as a method for disabling micro-organisms, was
discovered in the late 19th century. Around that time, Niels Finsen, a Danish physician,
created a UV-C emitting lamp, to successfully treat tuberculosis. This discovery earned him
the 1903 Nobel Prize for Medicine and Physiology. Since then, many scientific and engineering papers have been published on the sensitivity of various micro-organisms to UV-C and its germicidal effectiveness.

The degree of UV exposure is expressed as a UV dose (J/m-2, more correctly termed “fluence”), which is the amount of UV light delivered to the target microbe. UV dose is the product of UV irradiance and exposure time, meaning that a higher UV dose could be delivered by increasing the intensity of UV light, increasing the exposure time, or both. 

Testing Public Health England

ProtectivAir® has been rigorously tested at Public Health England, Porton Down laboratory, with highly successful results. Tests were done using virus-infected air actually passed through the ProtectivAir® irradiation chamber and analysed in the PHE laboratory. Tests compared infected air, where the UV light source was switched off, with the same air with the UV switched on, and was also compared against a placebo sample fo pure, uninfected air.

In 100% of cases, the UV light prevented infections from being transmitted, and the level of inactivation on known surrogate pathogens was measured, allowing the dlivered UV dose to be measured and applied to a range of other pathogens such as viruses, bacteria and spores.

Evidence

ProtectivAir® is backed by a body of evidence, aimed at answering the fundamental questions of ‘Does it Work?’, ‘Is it Safe?’ and ‘Will Users Accept it?’

We have shown through our rigorous tests at Public Health England, Porton Down that the system works, and can protect users to levels unachievable using conventional PPE. The unit is safe and tested via notified bodies to prove it meets the rigorous demands of the EU PPE directive.  This is supplemented by User Acceptance and Human Factor trials in real working environments to show that ProtectivAir® is practical and comfortable to use.

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For more information, please call us on +44 (0) 1922 458 255 or send us a message below.


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