1/ The guiding principles of the original #CorsiRosenthalBox design were (1) cost-accessibility (reduce disparities in ability to breathe cleaner air) & (2) effectiveness (in range or better of more expensive commercial HEPA air cleaners). (photo courtesy of @JimRosenthal4) 
2/ The original concept exceeds expectations in each area and has now been proven highly effective by many researchers w/ additive equivalent ACH that easily get many classrooms above 9-10 equivalent ACH (CR Box + ventilation) at relatively low cost.
3/ The recent NIOSH/CDC study indicates that two #CorsiRosenthalBox es in a classroom can add greater than 12 ACH to ventilation ACH - likely exceeding 15 equivalent ACH total. As some context, this exceeds ventilation design for most hospital isolation rooms. Yep. Knew that.
4/ For a classroom of 25 students integrated over 3 years (including capital cost, replacement filters & recurring energy costs of a single #CorsiRosenthalBox) the cost per student for much cleaner air is less than 1 Venti Caffe Mocha per year.
5/ As context, the avg cost to educate a child in the US is $13,000/yr. We can signficantly reduce student & teacher inhalation dose of virus-laden respiratory aerosol particles (& other aerosols) for less than 0.034% of cost of educating a child. (photo courtesy Andre Knoesen)
6/ Very low cost. Dramatic improvements in indoor air quality in classrooms. Less exposure to virus-laden aerosol particles, wildfire smoke, allergens, and even endocrine disrupting chemicals as per recent Brown University study. This is a no brainer, school district folks.
7/ There's been an evolution of a lot of GR8 new #CorsiRosenthalBox designs. I applaud these (keep them going). But let's not forget the original guiding principles & continue to strive for even more cost-accessible & effective systems as well. A spectrum of cleaner air for ALL.
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