Institute of Fluid Mechanics and Aerodynamics from 05.08.2020
- The content of the study was to examine whether mobile room air cleaners are suitable to contribute to reducing the risk of infection when free ventilation is no longer possible due to energy wastage in winter at the latest or due to a decline in people's well-being
- By using equipment with high-quality class H-14 filters, the aerosol concentration in a room with 80m² could be reducedto a low leveleverywhere within a short time.
- Mobile air purifiers are a very useful technical solution for greatly reducingthe indirect risk of infection through aerosols in schools, offices, shops, waiting rooms, community and club houses, recreation and dining rooms (canteens), etc.
- Daily heating of the filter is necessary to destroy the viruses and preventthe formation of biofilms, bacteria and fungi
- In the permanent operation of such systems, "no human being will manage to produce an aerosol concentration of infectious level in a room" (Prof. Dr. Kähler).
- Prof. Dr. Kähler from the University of the Federal Armed Forces in Munich recommends a 6-fold air exchange rate to keep rooms at a low aerosol level.
- To achieve fast and highly efficient filtration, a filter combination of classes F7 and H-14 is recommended
- Due to the high air circulation, a halving of the aerosol concentrations depending on the room size can be achieved within 3 -15 minutes and easily maintained at a low level.
- In contrast to free ventilation, mobile room air cleaners also ensure a real reduction in the virus load.
- In buildings/rooms (e.g. waiting areas, gyms) where large quantities of aerosols are generated due to large crowds and high workloads, the units can also be used to support air handling units.
