1/4 UV air disinfection is a good technology & useful for creating safer indoor environments during this pandemic. I fully support its use. (e.g.I recommended that a local correctional facility, a good application, look into its use as a means to control spread of COVID.)
2/4 I have given webinars and speak often about how upper room UV and in-duct UV are great technologies for many applications where there is crowding, unsuspected infection present etc. shellym80304.files.wordpress.com/2020/05/isiaq-…
3/4 UV systems need to be designed by professionals and maintained just like HVAC systems. I don’t usually recommend air cleaners w/UV as the UV disinfects the filter media, which you really don’t need to do–and it can add cost, but it is not harmful and its fine for air quality.
4/4 NOTE I am cautionary about ionizers because they need to be certified as ozone free. And many are according to UL2998 (but UL867 allows 50 ppb).
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