Regular airing with windows wide open is the best way to free room air from coronaviruses, but also from other air pollutants. But what to do when it’s cold outside but you don’t always want to freeze? Air purifiers are advertised in many places. What should you watch out for with these devices?
When buying an air purifier, do not just rely on the promises of the manufacturer. Make sure that the performance of the device has been tested and confirmed by an independent and reputable body.
Attention, not all air filters keep virus-containing particles out of the air! Only devices that have so-called High-Efficiency Particulate Air (HEPA) filters of class H13 or H14 can filter viruses or the smallest droplets (aerosols) laden with viruses.
The air purifiers selected as well filter aerosols. The good news is that all devices do a good job at first. The bad news, on the other hand, is that with an aged filter, only four out of seven devices reduce the concentration of virus-sized particles well. However, they do this convincingly over a long period of time.