Can fans be used safely inside? "Air blowing from an infected person directly at another person in a closed space increases the risk of the virus spreading from one person to another. If COVID-19 is circulating in your community and the use of a table or pedestal fan is unavoidable, it is important to regularly bring in air from outside by opening windows or doors, while minimizing how much air blows from one person (or group of people) to another person (or group of people). The use of ceiling fans can improve the circulation of air from outside and avoid pockets of stagnant air forming indoors. However, it is critical to bring in air from outside when using ceiling fans, such as by opening windows. " (World Health Organization) Ventilation and air conditioning