With schools having had to deal with extreme disruption during the pandemic, head teachers have been looking for ways to mitigate COVID transmission in schools to help ensure children can learn safely in the classroom. The Government has cited the importance of well-ventilated rooms, with ventilation a key mitigation that helps reduce COVID cases. In fact, a recent study by the Swiss Federal Laboratories for Materials Science and Technology (EMPA) has found that poorly ventilated classrooms result in six times the number of COVID cases.