1/ Proven Technology. The cost to put a very good portable HEPA filtration system in a classroom that typically holds 24 or 25 students is approx $10/student/yr (year 1), with recurring filter & energy costs of around $7/student/yr. Per year. Not per day, week, or month.
https://twitter.com/CorsIAQ/status/1370118525944176642
2/ The system can often yield an equivalent of 3 or more ACH &, at ventilation rates I have seen in a majority of schools in Texas, 60-75% overall reduction in inhaled dose of virus-laden paricles in shared air.
3/ In the US we spend approximately $15,000/year to educate a SINGLE student. To effectively reduce virus-laden particles in classroom air would add a whopping $7-10/student each year to this total. Two Grande Frappaccunios, folks. Proven technology.
4/ If noise is a concern (it is not for me) then splurge and purchase two units/classroom for a whopping four Grande Frappuccinos per year per student and use lower settings. Stop making excuses, folks. Spend money on proven technologies. Just do it!
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