The technique of air purification via UVC lamps has been an approved technique for years.
The device is a recirculation unit using UVG1 (ultraviolet germicidal irradiation) for the high reduction of bacterial and viral load.
The germicidal action is achieved through the destruction of the microbial load in the air in complete safety, exploiting short wavelength UV radiation (in the UV-C spectrum).
UVC lamps eliminate viruses of size 0.1 micron and above.