Check the Quality of Unfiltered Recirculated Air

Researchers in the Netherlands wrote a research letter on August 28, 2020, documenting a COVID-19 disease outbreak that sickened residents and staff in a nursing home. 'We advise that prevention of COVID-19 transmission should take into account the possibility of aerosol transmission in healthcare facilities and other buildings, where ventilation systems recirculate unfiltered inside air,' stated these researchers.