PLR-Silent removes more than 99 % of viruses from the room air

After just 45 minutes, the viral load in a simulated classroom was reduced by 99.43%. This is the result of the Fraunhofer Institute for Building Physics, which tested the PLR-Silent as one of the first room air purifiers of its kind for its efficiency in reducing and inactivating airborne viruses.

In the test, the reduction and inactivation of airborne surrogate viruses (enveloped PHi6 bacteriophage with a comparable structure, particle size and environmental stability to SARS-CoV-2) was investigated using the PLR-Silent. The mock classroom was equipped with chairs, tables and dummies to simulate as real a situation as possible. The air purifier drew the virus-laden air through the filter units. The viruses were inactivated inside the device by the UVC light and safely trapped by the HEPA H14 filter.

The 127 m³ room was contaminated with the surrogate viruses via an aerosol generator for the first two hours. After one hour, the PLR-Silent was switched on so that the aerosol generator and air purifier ran in parallel. Two samples were taken within this hour. After just 45 minutes, the recovery of active viruses was reduced by 99.43 %. In addition, the ozone concentration in the room was measured, which was a maximum of 1 μg/m³. This corresponds to less than 1 % of the legal limit value.

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