Make sure that the air purifier is not running when you open up its casing for filter changes or cleaning.Make sure that the air purifier casing is securely closed, without any opening that exposes its UV light.Therefore, several precautions should be taken when using a UV air purifier: Exposure of UV-C radiation towards skin or eyeĭue to its ability to destroy DNA, direct skin or eye exposure to UV-C radiation can cause direct harm. Much like ionisers, the use of UV light in an air purifier raises some concerns about its impact on human health. The lack of a HEPA filter in an air purifier greatly reduces its ability to disinfect the air. UV lights greatly reduce the chances of reintroducing bacteria and viruses into the air when you open up the air purifier to change the filter. ![]() Having HEPA filters installed in UV air purifiers serves the essential purpose of trapping bacteria and viruses that are as small as 0.3μm, which in turn gives the UV radiation enough time to inactivate these trapped germs. This is where a good quality HEPA filter comes in handy. However, this is not an immediate process-it can take up to a few minutes of direct exposure to completely inactivate bacteria and viruses. The damage inflicted on the DNA disables these bacteria and viruses from carrying out their normal functions subsequently, they lose their infectivity and die. ![]() To disinfect the air, UV-C radiation damages the DNA of bacteria and viruses, and even mould spores, when they are exposed to the radiation for a period of time. Instead, it is safely contained within the air purifier to disinfect only the air that passes through the air purifier. UV-C radiation in an air purifier does not escape the confines of the air purifier to disinfect the surrounding air. How does UV light disinfect the air passing through air purifiers? UV-C lights are also known as germicidal lights. UV-C radiation has been used for decades in the medical field to reduce the spread of bacteria, such as tuberculosis. Even though UV-C radiation in air purifiers is created artificially using UV light, it has similar properties to the UV-C radiation coming from the Sun. The type of UV radiation used in air purifiers is UV-C radiation, which has a wavelength of 100-279nm. The ozone layer of the Earth absorbs all UV-C radiation and most of the UV-B radiation, but UV-A radiation reaches the Earth's surface all year long. This distinction is made based on their wavelengths. The UV light used in air purifiersįound naturally in sunlight, UV radiation may be classified into 3 types, namely UV-A, UV-B, and UV-C. ![]() Among various germicidal technologies used in air purifiers, UV light has proven to be one of the efficient technologies for inactivating bacteria and viruses in the air. Due to rising concerns about virus and bacteria transmission indoors, consumers have taken into account the ability of air purifiers in destroying germs when choosing a suitable air purifier for their homes. Air purifiers are common air treatment devices used in Australia to remove allergens in indoor air such as dust, pet fur, and pollen.
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