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School lessons during the SARS-CoV-2 pandemic

ASPUR air purifiers
School lessons during the SARS-CoV-2 pandemic
Study by the University of the Federal Armed Forces in Munich, Institute for Fluid Mechanics and Aerodynamics from September 22nd, 2020

Result summary:
  • The content of the study was to examine whether mobile room air purifiers are suitable for reducing the risk of infection if free ventilation is no longer possible due to energy wastage in winter at the latest or due to a loss of well-being of people
  • Through the use of mobile air cleaners with high-quality class H14 filters, the aerosol concentration in a room with 80m² could be reduced to a low level within a short period of time
  • Mobile room air cleaners represent a very sensible technical solution to greatly reduce the indirect risk of infection from aerosols in schools, offices, shops, waiting rooms, community and club houses, lounges and dining rooms (canteens), etc
  • Daily heating of the filter is necessary to destroy the viruses and prevent the formation of biofilms, bacteria and fungi
  • In the long-term operation of such systems "no one will be able to generate an aerosol concentration of an 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 change to keep rooms at a low aerosol level.
  • In order to achieve fast and highly efficient filtering, a filter combination of classes F7 and H-14 is recommended
  • Due to the high air circulation, depending on the size of the room, the aerosol concentrations can be halved within 3-15 minutes and kept at a low level without any problems.
  • In contrast to free ventilation, mobile room air purifiers also ensure a real reduction in the virus load.
  • In buildings/rooms (e.g. waiting areas, fitness studios) in which large amounts of aerosols occur due to large crowds and high workloads, the devices can also be used to support HVAC systems



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