As the only mobile air cleaner worldwide, the TAC V+ was specially designed for the purpose of virus filtration and, in this respect, has been tested for its effectiveness in the context of several scientific studies.
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TAC high-performance air purifiers show convincing results in the scientific test laboratory

Current studies confirm that the TAC high-performance air purifiers effectively reduce the airborne SARS-CoV-2 infection risk in interior spaces

Panorama photo of the experimental space including the components for measuring the concentration
The HEPA H14 virus filter from Trotec at the Institute for Fluid Mechanics and Aerodynamics
Laser measurement of the aerosol particle concentration in the room air
Before and after analysis of the particle concentration measured
Prof. Dr. Kähler installing the test set-up with the air cleaner TAC V+
Analysis of the measurement results of an air purification process with the TAC V+
Documented reduction of the aerosol concentration in the room by use of the TAC V+

Study 1: "Can mobile room air cleaners effectively reduce the risk of an indirect SARS-CoV-2 infection caused by aerosols?"

The TAC V + mobile air purifier was specially developed for virus filtering and has been tested for its effectiveness in several scientific studies. A study conducted by Prof. Dr. Christian Kähler at the Institute for Fluid Mechanics and Aerodynamics of the University of the German Federal Armed Forces in Munich has confirmed that with the TAC V+ the aerosol viral load and therefore an airborne risk of infection in interior spaces can even be substantially reduced with the windows closed and without a suitable interior ventilation system.

Excerpts from this study and conclusions:

"The quantitative measurement results show that, with the TROTEC TAC V+ room air cleaner tested, due to the large volume flow and the filter combination of class F7 + H14, aerosol concentrations even in rooms with a surface of 80 m² can be reduced by half within 6 – 15 minutes, depending on the volume flow. In the case of rooms with 20 m² the concentration is halved within approx. 3—5 minutes depending on the volumetric flow.

Therefore, room air cleaners of the TAC V+ type make it possible to easily maintain the aerosol concentration in small-sized to medium-sized rooms at a low level. ... Air purification units of the TAC V+ type are therefore perfectly suited, for instance, to provide for a constantly low virus load in classrooms, shops, waiting or treatment rooms, without having to think about opening windows and affecting the well-being in the room. Furthermore, in contrast to free ventilation by means of windows they also ensure a true reduction of the virus load, something that free ventilation can often not guarantee.

In addition and compared to room ventilation systems working without or only with a small proportion of fresh air , they also offer the benefit of ensuring that the viruses are actually filtered out and that they are not spread within the building through other channels. ... "To ensure that the room air cleaner always remains hygienically safe even in continuous operation over many months, the H14 filter should be heated to approx. 100 °C for about 30 minutes every day, in order to destroy the viruses in the filter and prevent the formation of biofilms, bacteria and fungi without the use of any harmful chemical additives or UV-C radiation."

In an interview with the news magazine "Spiegel", Prof. Dr. Kähler summarizes his research results with regard to the TAC V+ as follows: »If you let this system run permanently, no one will manage to generate an aerosol concentration of an infectious level in any room!«

Direct link to the study
To the international publication of this study on the specialist portal ResearchGate

On the specialist portal ResearchGate for medical and health care specialist publications, you can also find an international publication of this study .

The TAC V+ from Trotec is the only mobile air purification unit provided with a special H14 high-temperature lamellae particulate air filter with thermal decontamination, a process in which the EN 1822-certified H14 filter is treated thermally at regular intervals and is heated to approx. 100 °C, a procedure which practically destroys all viruses filtered out and which, by scientific expertise, is therefore defined as absolutely indispensable to effectively purify the air from viruses! Only the combination of an effective F7-H14 filter system, a perfectly balanced air volume flow and the exclusive thermal filter decontamination technology provides for an effective protection against infections!


In the test, a classroom with plexiglass partitions was simulated
To the international publication of this study on the specialist portal medRxiv

On the specialist portal medRxiv for medical and health care specialist publications, you can also find an international publication of this study .

Study 2: "School education during the SARS-CoV-2 pandemic – Which concept is reliable, feasible and environmentally sound?"

In this second study, Prof. Dr. Kähler's team specifically focussed on the issue of which protective measures would be effective and reasonable to make every-day school life safe.
On the basis of this objective, the study illuminates several possible safety concepts from free ventilation to room air purification, including the use of CO2 traffic lights and protective masks.

The conclusion of this study: "Protective concepts in the context of which the risk of an indirect infection is reduced by the use of air cleaners offer the advantage of separating or inactivating the viruses in the room after only a short time, if firstly the air change rate per hour at least corresponds to six times the room volume, secondly it is absolutely ensured that 99.995 % of the viruses are separated directly while passing through the device once, a process explicitly requiring a certified filter of class H14, and thirdly, the device is so silent that it is actually used and not deactivated due to the interfering background noise."

The Trotec air cleaner TAC V+ meets all these requirements and therefore offers reliable infection protection in classrooms and interior spaces that are used for similar purposes.

Direct link to the study

Elaborate study by TU Delft yields impressive results

Delft University of Technology, Netherlands: Air purification is more effective than intense airing with open windows or doors

In a comparative test, Dutch researchers from Delft University of Technology investigated how quickly aerosol concentrations in a room can be reduced by intense and cross ventilation, but also by ventilation systems and air cleaners.

The result: The best results were achieved in almost all test setups with a high-performance air purifier TAC V+. In addition, the measurement results prove that intense airing only allows for a comparatively low air exchange.

Here you can download the entire study as a PDF.

Here you can download the entire study as a PDF

Further studies for download:

"Investigations on the ventilation situation in a lecture hall in building 033 at the University of the Federal Armed Forces in Munich

Christian J. Kähler, Thomas Fuchs, Rainer Hain

Institute for Fluid Mechanics and Aerodynamics
University of the German Federal Armed Forces in Munich

Direct link to this study ...

Investigations on the efficiency of room air cleaners in a restaurant

Christian J. Kähler, Thomas Fuchs, Rainer Hain

Institute for Fluid Mechanics and Aerodynamics
University of the German Federal Armed Forces in Munich

Direct link to this study ...

Investigations on the efficiency of room air cleaners in a restaurant

Study 3: "Investigations on the efficiency of room air cleaners in a restaurant"

Gastronomy has largely come to a standstill due to the renewed lockdown in Germany and other countries. This poses problems for the operators and employees, sometimes threatening their existence. Against this background, the team led by Prof. Dr. Christian Kähler investigated whether a combination of existing protective mechanisms in the catering trade could enable largely safe operation during the pandemic. To answer this question, scientific experiments were carried out in a restaurantto investigate in particular whether the risk of indirect infections can be significantly reduced with the help of room air cleaners even in very complex room situations.

The conclusion of this study: "Based on this and previous studies conducted by the authors, it can be assumed that the occurrence of infections in the catering trade can generally be reduced by a combination of protective masks, protective screens and controlled room air purification by mobile room air cleaners or interior ventilation systems. It would therefore be desirable if gastronomic businesses that establish these protection concepts were spared a lockdown."

Test room in a gastronomic business
Investigations on the ventilation situation in a lecture hall

Study 4: "Investigations on the ventilation situation in a lecture hall at the University of the Federal Armed Forces in Munich

Currently, various solutions are being discussed on how to effectively reduce the risk of indirect infection indoors through virus-carrying aerosol particles. This can be done by opening windows for airing, or with the help of a room ventilation system or a suitable room air cleaner. The question is how efficiently these solutions minimize the risk of infection. In this study, Prof. Dr. Kähler and his team investigate the efficiency of a modern ventilation system in a lecture hall of the University of the German Federal Armed Forces in Munich. For comparison, the efficiency of intense and cross ventilation as well as of a mobile TAC V+ room air cleaner was also investigated.

The conclusion of this study: A reduction of the virus load in the room can be achieved very efficiently with a highly modern room ventilation system and an air change rate of almost 6 times. Cross ventilation through both windows showed a slightly higher air change rate than the ventilation system in the investigations. However, out of 15 minutes, the windows would have to be open for 10 minutes and closed for 5 minutes to achieve a similar efficiency as the ventilation system. Mobile room air cleaners such as the TAC V+ can achieve a cleaning performance comparable to that of a room ventilation system. The examined TAC V+ air cleaner is a quick and cost-effective solution that, in contrast to ventilation through windows, continuously provides a consistently high level of room air filtration, regardless of the size of the windows and of the wind and temperature conditions, and without interrupting work by regularly opening and closing the windows as well as without unpleasant temperature conditions in the room.

Direct link to the study

We'll be happy to provide you on request with detailed information about further studies performed on the effectiveness of the high-performance air purifier TAC V+.


Air cleaner FAQ for virus filtration

Learn more about the technical possibilities of virus air filtration

You want to know which technical aids offer effective protection against viruses in the room air? Do you have any questions with regard to the different cleaning methods offered on the market, their functional principle and their suitability for virus filtration? Visit our air cleaner-FAQ for virus filtration – Here you'll find answers to all of your questions with regard to air purification, virus filtration, standards as well as filter classes and of course the high-performance air purifier TAC V+ ...

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Techn. data TAC M

Techn. data TAC ECO

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Use of the TAC V+ in the Munich "Salon Rouge" star restaurant