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Leading virologists have discovered that almost half of the risk of infection is due to droplets that are emitted when breathing and speaking, and to a greater extent when sneezing or coughing. They fall to the ground in a radius of about 1.50 metres.

Aerosols play a major role in the spread of COVID-19. They consist of tiny virus-containing particles that remain in the air like fine dust, swirl and are transported over long distances. They are contagious for several hours. To become infected, it is sufficient to breathe in the virus-contaminated air after the infected person has been in the room. Transmission through aerosols has also been proven for measles, tuberculosis, influenza and Sars-CoV-1.

According to recommendations of the WHO and the German Robert Koch Institute, personal distancing and face masks help to prevent the risk of infection through droplets and aerosols. However, only FFP2/3 masks, which are mainly used in the medical sector, offer effective protection.

In closed indoor rooms, effective ventilation is therefore crucial to minimise the risk of infection from aerosols containing viruses in the air.

Permanently installed ventilation and air-conditioning systems (HVAC) can contribute to reducing the risk of infection. This is all the greater the more fresh air is supplied - ideally 100 per cent outside air. This dilutes the existing room air and thus reduces the concentration of virus-containing aerosols in the breathing air. So far, it is not certain what concentration of viruses triggers an infection.

Room air conditioning systems are designed specifically for the respective rooms and must take superstructures and flow obstacles into account as much as possible. Especially in the case of variable room use, such as function rooms and event halls, these can prevent the optimum air quality from prevailing in all usable areas. In this case, professional mobile air purifiers are a good supplement for zonal air quality management.

So far, it is not certain what concentration of viruses triggers an infection. The air exchange rate describes how often the total air volume in a room should be mathematically exchanged with fresh air in one hour. The prescribed air exchange rates for public rooms of 4 - 8 times per hour are based on general pollutants in the air such as the CO2 concentration. In the medical sector, where viruses have had to be taken into account exclusively up to now, significantly higher air exchange rates of 12 - 15 times per hour apply. According to Lufthansa, this increased air exchange rate is also used in aircraft.

The air flow rate of the device is of greater importance than the pure efficiency of the filter, according to the Society for Aerosol Research in its "Position Paper on Understanding the Role of Aerosol Particles in the SARS Cov-2 Infection Event" of December 2020.

The air exchange rate also says nothing about how the air flows of supply and exhaust air from the occupied and breathing zones are distributed in the room, i.e. about the ventilation-induced dispersion behaviour of virus-containing aerosols in the room air: the further infected aerosols spread in the room, the higher the risk that the concentration of dangerous aerosols in the room will increase overall and thus also the risk of infection.

Even a single infectious person can possibly spread enough virus-containing aerosols to infect the people in their immediate vicinity or even via the room air. The longer the time spent next to a person infected with COVID-19, the higher the risk of infection. This makes effective, professional air purification in all indoor areas with public traffic all the more important.

Viruses and bacteria are emitted together with aerosols, i.e. small particles that can float and swirl in the air. These aerosols are usually larger than 1 micron.

Aerosols containing viruses can be removed from the air stream with a HEPA filter. This filter technology is proven in medical areas and reduce aerosols containing viruses and bacteria to > 99,95 percent.

An upstream fine dust filter ensures a longer service life of the finer-pored and more expensive HEPA filter. We use certified high-performance filters from renowned manufacturers with international availability.

Optionally, UVC lamps can be used for disinfection in the unit.

The indoor air purifier M-8 for professional use can purify a maximum of 8,000 cubic metres of air per hour from viruses, bacteria and microbes. It can effectively clean a room with an area of over 500 square metres or up to 1,300 cubic metres of aerosols containing viruses. This applies to an air exchange rate of six and a room height of 2.50 metres .

As the room size increases, higher volume flows are required to remove airborne viruses and bacteria from the existing room air by means of HEPA filters. This is accompanied by an increase in fan noise.

The air filter is designed in such a way that the optimum cleaning performance for two typical areas of use - conversations and public traffic in public spaces - simultaneously meet the requirements for noise emissions and enable efficient operation

The anti-virus filter requires a 230 volt power connection and can be put into operation immediately.

The running costs consist of the electricity costs depending on the duration and intensity of use. In addition, there are the filter changes according to the recommendations of the filter manufacturers. The proper functioning of the filter system is continuously monitored telemetrically. The filters have to be changed approximately every six months.

The air filters can be controlled manually or by remote control. Usually, an operating mode is defined for different time periods i.e. opening ours and controlled automatically. Sensor-driven control, e.g. via CO2 sensors or people counting, is also possible.

The technical key figures are recorded telemetrically and monitored automatically. An alarm function ensures that any malfunctions become known immediately and can be remedied.