UV Air Purifier - How Does It Work?

UV Air Purifier - Controversial - Maybe

Is Ultraviolet Effective in Air Purifiers?

Ultraviolet [UV] light is a known proven effective way to sterilize germs, bacteria, mold, viruses, and other microorganisms. However, these results are achieved in a correct controlled environment. For example, if a surface with germs on it, is directly exposed to UV light with enough intensity (dosage) for a long enough period of time (exposure), the surface will be sterilized. However, it becomes more difficult to attain this control when you try to sterilize microorganisms in an air purifier. The biggest question in regard to UV light in an air purifier, when the micro organisms are moving through the air purifier at a fairly high rate of speed because of the fan, but are they exposed to the rays of the UV light long enough to alter the DNA and the RNA of the micro organisms? There will be a higher efficiency of sterilization of micro organisms the lower the fan speed. However, if someone is also trying to clean the air of other particulates at the same time, there will be a decrease in air changes by lowering the fan speed, and thus a decrease in the air cleaning capacity of the machine. Another hybrid approach is to have a UV light that bathes the Hepa filter with continuous light which will kill all of the micro organisms that have been trapped by the Hepa filter. This means there will be no need to worry about what is happening to all of these bacteria and germs that are sitting on the Hepa filter for such a long period of time. However, there is also concern as to what the rays from the UV light will do over time to the material of the Hepa filter. The Hepa material can become brittle and start to break up over time when exposed to UV light so the life of the Hepa filter may become shortened.

The Clarifier ADS air purifier is a great example of an air cleaner where the company has tested its effectiveness in medical systems and are confident that their product will work in all sorts of situations where virus control is needed.

By David Barnaby and Mercia Tapping

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