AVATOR – Anti-Virus-Aersol: Testing, Operation, Reduction with project "Virus Grill"

Aerosols pose an increased risk of infection with SARS-CoV-2. This is where the "Virus Grill" project comes in. The aim is to inactivate viruses by heating the air, to reduce the probability of infection via droplets suspended in the ambient air. Virus Grill is a subproject of the AVATOR project exploring ways to reduce the risk of infection from aerosol-borne viruses in enclosed spaces.

The speed at which viruses such as SARS-CoV-2 spread can be significantly slowed down by interrupting transmission chains. According to current knowledge, SARS-CoV-2 is transmitted mainly by droplet infection. The greatest danger is posed by virus‑containing aerosol clouds, i.e. tiny droplets suspended in the air.

This is where the "Virus Grill" project comes in, which is  being developed by Fraunhofer IFAM in Dresden: The thermal inactivation of viruses by heating the air is intended to reduce the probability of infection via aerosols. For this purpose, the germ-bearing ambient air is sucked in and heated in a device called "Virus Grill" before the hygienized air is then re-cooled and released back into the environment.

The disinfection of the air is to be achieved by using and combining various technologies. At Fraunhofer IGB, aerosol clouds of SARS-CoV-2 surrogate viruses are simulated and generated to test the functionality of the “Virus Grill” by analyzing the active vs. inactive viruses.

Virus Grill is a subproject of the “AVATOR – Anti-Virus Aero-sol: Testing, Operation, Reduction“ project coordinated by Fraunhofer IBP and funded in the “Fraunhofer vs. Corona“ program. In addition to technologies for purifying the indoor air, AVATOR investigates the spread of aerosols and derives hygiene concepts for different scenarios. The developments will ultimately be tested in laboratory environments and then validated in real environments.

Especially educational institutions, hospitals, care facilities, hotels, and other forms of accommodation, railway and aircraft operators, manufacturing companies and office-based firms will receive answers with regard to hygiene issues as well as practical solutions to prevent the spread of aerosol infections.

Project information

Project title

Cluster project AVATOR – Anti-Virus-Aersol: Testing, Operation, Reduction with subproject "Virus Grill – Thermal inactivation of aerosol-borne viruses in air"


Project duration

October 2020 – September 2021


Project partners

  • Fraunhofer IBP (Coordination)
  • Fraunhofer EMI
  • Fraunhofer ITWM
  • Fraunhofer ICT
  • Fraunhofer LBF-K
  • Fraunhofer IAP
  • Fraunhofer IMM
  • Fraunhofer ITEM
  • Fraunhofer IFF
  • Fraunhofer IPM
  • Fraunhofer IGD
  • Fraunhofer IGD-Graz
  • Fraunhofer IGD-Singapore
  • Fraunhofer IFAM-DD
  • Fraunhofer IFAM
  • Fraunhofer IGB


Project funding

This work was supported by the Fraunhofer InternaI Programs (»Fraunhofer vs. Corona«)