1/ I have spoken with dozens and dozens of school districts. My recommendations include universal masks, increased ventilation, and stick with PROVEN technologies.
https://twitter.com/MarcelHarmon1/status/1371929464528105472
2/ Improved filtration as per MERV rating (to MERV-13 if possible), portable HEPA filtration (appropriately-sized), and upper-room or in-mechanical-system UVGI (in-system if significant recirculation rates high). Add good DYI box-and-fan systems if sealed properly. Just Do It!
3/ When a district official says "Yes, but I hear that this ..." or "What about this ....". I just repeat - stick with PROVEN technologies (see above). "But we were told ..." stick with PROVEN technologies. "But ...." Stick with PROVEN technologies.
4/ The list of PROVEN technologies is pretty darn short. Stick with it. Don't fall for slick marketing, gimmicks, and (on some website I have seen - incorrect science or highly deceiving statements).
5/ Do not fall for "our system is highly efficient". Unproven portable air cleaners can be close to 100% efficient at removing what goes through them and be largely ineffective if little air moves through them.
6/ The conditions that many are "tested" at are irrelevant to actual buildings and when data are presented (by a few companies) they simply translate to ineffective systems in actual use. Stick with PROVEN technologies. Just Do It!
7/ Don't even ask questions. Stick with PROVEN technologies. Use your precious $$ wisely. Stick with PROVEN technologies. Masks, ventilation, PROVEN technologies. "But I was told ..." PROVEN technologies. "But they said ..." Stick with PROVEN technologies. Just Do It!
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