Ventilation is a key way to help prevent the spread of COVID-19. Combine ventilation with other important public health measures to keep you and others protected against COVID-19. For more detailed guidance: https://bit.ly/3oUarYE
source https://perilofafrica.com/2021/12/liked-on-youtube-covid-19-ways-to-improve-ventilation-and-air-filtration-in-your-home.html