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Office, Restaurant, school or Uni: In closed areas there is often little exchange of air. If you are staying a longer time with many other people inside, has an increased risk of being infected with the Coronavirus.

Like this many other pathogens spread through the air. Also the big Corona outbreak in the Tönnies plant in Rheda-Wiedenbrück could go back on air transmissions.

In order to bring the air to low temperatures, this would be pulled from the room, cooled and returned to said Hygiene expert Martin Exner of the University of Bonn.

He suggested high-performance filters and UV-radiation, which will prevent viruses in the future, distributed over such a System.

At the latest, according to these findings, the question arises: How can be made the inside rooms are really Corona-free and keep it that way?

High-performance filter

The Exner recommended high-performance filters, even Hepa Filter to be called, has been used for many years, for example, in operating rooms of hospitals.

They are made of synthetic fibers, which are stacked in several layers one above the other, said hospital hygienists, Michael Pietsch of the University of Mainz.

Particles to be separated according to the Filter by means of various physical effects on the fibers and remain there. Also corona virus could be filtered out.

Disinfection by nebulization

Some companies and event organizers to disinfect the rooms by the nebulization of a disinfectant. Various means are used, some of which are quite dangerous.

For over 100 years, the room disinfection by means of formaldehyde-be used-proliferation, said the hospital hygienist Pietsch.

The cost of this, however, is very high, in addition, formaldehyde could cause cancer, whereby a space could not be accessed.

Photo gallery: 10 tips for protecting against viruses and bacteria

Alternatively, hydrogen peroxide is used. An advantage of the residue-free decomposition into water and oxygen, so Pietsch was.

However, there is a need for this method, a longer period to wait, since hydrogen peroxide can be harmful if Inhaled.

Allergy-friendly and naturally degradable is the way, which tried the Berliner Ensemble for room disinfection. According to information from the theater safe disinfectant Amoair will device via a Nebulization or use of an existing ventilation system dispersed in the air.

A first test run have shown that about 99 percent of all bacteria and viruses could be destroyed through the fog.


Bacteria and viruses can be killed by UV rays. For room disinfection, the method is suitable but hardly: So that the rays act at all, should be the distance between the radiation source and the subject of 10 to 30 centimeters, the Mainz Hygiene expert Pietsch.

“A room air disinfection would only be possible if the air is moved and thus the germs again and again to the radiation source to be guided.”

In the food industry, the method can be used, however, useful, for example for the disinfection of packaging films.

Air-conditioning systems

Common than time-consuming disinfection procedures air conditioning systems are probably. They ensure a supply of fresh air from the outside and cool or warm this: The old air is extracted, and then either released to the outside, or, together with fresh air back into the interior brought.

“In any case, there is a reduction of the germ concentration in the indoor air,” said Pietsch.

The Federal industrial Association for Technical building equipment (BTGA) is recommended for cooled rooms with recirculated air mode, which it operated in battle, air-conditioning systems with high-quality Filters.

In the case of installations in offices, Hotels, Shopping Malls or Convention centers, a high outside offer air the best protection against infection.

“We recommend, especially in situations like the one we are currently experiencing to keep the percentage of recirculated air in air conditioning and ventilation systems as low as possible,” advises BTGA-President Hermann Sparrowhawk.

According to the Association for a Transmission of coronaviruses via ventilation or air conditioning systems can be virtually eliminated if the equipment, expertly operated and regularly maintained.


But even without a great technical device, the infection can be reduced to spaces of communities of risk in the interior: shock-ventilation with wide open Windows provides the fastest way for an exchange of air.

“Most of the rooms are warmer inside than the outside air, so that there is a draught from the inside to the outside. Thus, a potential virus concentration in the interior can be reduced,” said Hygiene expert Pietsch.

In addition, the risk of infection via aerosols is reduced. Completely exclude the possibility of infection does not but it.

Masks and distance

Even if it have all heard infinite number of times: The Wearing of masks and to Comply with the distance rule, continue to be important measures to protect against Corona virus infection.

Also, the Wearing of a simple mouth-nose-protection can minimize a flow of air significantly.

Deutsche Presse-Agentur (dpa)

*The Contribution Of “Virus Concentration: Fresh Air? So the air in the room as Corona, will be published-free” is of FitForFun. Contact with the executives here.