From Mari DeSchryver: UV Air Purification
Ultraviolet (UV) light has been used in the United States to purify water, wastewater, and indoor air since 1903. When combined with an air filter, it is a reliable way to make sure your indoor air is clean and safe.
Before we get into how UV technology purifies your air, it is important to understand UV light on its own. There are three types of UV light: UV-A, UV-B, and UV-C. UV-C is the wavelength utilized by UV air purifiers because it is the most effective against microorganisms and pathogens. You may or may not know that UV-C is the most dangerous ray of UV light to be exposed to, but don’t worry, the UV lights in air purifiers are safely positioned within the walls of your ductwork inside your home, so as long as you do not look at or touch the light when it is on during replacement, there is no harmful exposure to you or your family.
UV lights are used because they do the best job inactivating bacteria, mold spores, viruses, mildew, and other harmful airborne contaminants in your home. They use a process called Ultraviolet Germicidal Irradiation (UVGI) which is when ultraviolet light exposure damages and neutralizes the DNA and RNA structures of microorganisms and pathogens. In an example from “What Does a UV Light Do Within An Air Purifier? (And Does it Work?), an article by Home Air Guides, they explain how UVGI works against bacteria and viruses. Because bacteria are single-celled organisms they rely on their DNA to survive, so when that DNA is damaged, they basically self-destruct. Viruses are a bit trickier because they are made up of sets of genes within a capsid, which is essentially a protective protein shell. According to the U.S. Food and Drug Administration, “UVC radiation has been shown to destroy the outer protein coating of (viruses)” which is an effective way to render them inactive.
UV air purifiers don’t only protect your indoor air quality, they also keep microbials from building up on ductwork, coils, and other parts of your system. An Amazon customer reviewing a UV light said that “it eliminated a white slimy residue” that she found in her air conditioning unit’s coils and that she “needed it a lot more than she thought”. The item she ordered was a small UV light purifying kit and she said she went ahead and bought a larger kit for increased sanitation.
GeneralAire® offers a wide range of UV air purifiers that are installed within your duct system. Because of their location, they silently inactivate germs, bacteria, and viruses in your home’s indoor air so you don’t have to worry. General Filters Second Wind™ residential UV air purifiers peacefully inactivate airborne pathogens inside your home so that you can breathe healthier®.