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No it isn't that easy, nor is if effective. It may clean out virus' in an empty room, but it cannot handle purifying while a group of people are in there.
We talked about this prior to Trump's church rally in Tulsa:
Phoenix Church Hosting Trump Claims That Air System Kills 99.9% Of Covid-19 Coronavirus
Trump Megachurch Went Too Far With COVID-19 Air-Purification Claims, Company Now Admits
I found the Duke news page with the news about the calculator:
Online Tool Calculates Risk of Classroom Transmission of Airborne COVID-19
https://nicholas.duke.edu/news/online-tool-calculates-risk-classroom-transmission-airborne-covid-19
The actual calculator:
COVID exposure modeler
And on that page I saw a link to FAQs. Much of all this is too technical for me to understand, but I saw this, which referenced the nytimes article about the Arizona church, fwiw.
A company is promoting an air cleaning system using ions, plasmas, or OH radicals. Do these systems work?
Be very careful with that type of system. They are being promoted very aggressively, but often there is very little detail given about how the system really works. In some cases claims are made that are obviously wrong or suspicious. See this NYT article as an example: https://www.nytimes.com/2020/06/23/us/politics/trump-arizona-church-covid.htm Oxidation systems will turn volatile organic compounds (VOCs) in the air into more oxidized species, NOT into CO2 and water, and the oxidized species and aerosols formed may actually be worse for health than the original VOCs.
My group has done extensive research on similar systems, from the point of view of atmospheric chemistry applications, see https://doi.org/10.1039/C9CS00766K. I have not seen a lot of peer-reviewed analyses of the details of these "advanced" cleaning systems. There is one in this paper: https://iopscience.iop.org/article/10.1088/1361-6463/ab1466