In autumn and winter we tend to increase the amount of time we spend indoors. Schools, offices, restaurants, sports facilities and other enclosed spaces will have significantly more people in them at the same time during these months. Fortunately, even in exceptional situations – such as the current coronavirus pandemic – a safe and healthy climate can even be created indoors by means of ample natural ventilation.
Removal of aerosols by means of regular air exchange
In rooms with automated ventilation, wearing a cloth face mask and adhering to the rules of hygiene and social distancing are complemented by the most effective component: stale air is replaced with fresh air from outside and aerosols are effectively removed. The most critical factor here is the amount of air replaced during ventilation. The required air exchange rate is always significantly higher whenever there are a lot of people in a room at the same time, such as in a classroom or restaurant, or when people are engaging in physically demanding activities. This is true in sports halls and in large rooms where there is a lot of loud talking, such as in a theatre or at a choir rehearsal.