"We didn't optimize placement or air changes or make sure they were turned on so air filters don't work" The study's limitations aren't trivial: they're disqualifying. What SHOULD have been measured: fluid dynamics, viral presence, particulate spread, etc. was not. WTF. #JunkScience #HEPA #JAMA
Dose matters! Bedroom units ran at 60 m³/h on the quietest “sleep setting”. In a typical single room that’s roughly 2 air changes/hour. Aerosol engineering consensus generally wants 6+ ACH for meaningful pathogen load reduction. This tested low-dose comfort settings, not adequate filtration.