Safe breathing zones

For good times

Effective ventilation - An active contribution to COVID-19 protection

The invisible danger posed by SARS-CoV-2 viruses in the air is far from over. Only when people feel safe will they resume their usual activities. To ensure safe contact with people outside the home, protective measures are required that demonstrably lower the risk of infection with COVID-19. Effective air purification is pivot for minimising the risk of infection with virus-containing aerosols in enclosed spaces, as has been demonstrated in several studies. 


Antivirus Filter

The Antivirus Filter prevents the spread of viral aerosols at source. It creates local respiratory protection zones with a significantly reduced risk of airborne infection with COVID-19, influenza, measles and other corona virus-based diseases.

Several Antivirus Filters work in combination to form a modular, scalable system for active management of indoor air quality. Simulations of the real environment are used to determine an effective tailor-made air filter solution - for offices and business facilities, public-facing premises as well as for convention centers and large halls e.g. at airports.

The large infoscreens on both sides of the Antivirus Filter allow local infotainment about the protective measures taken as well as own and third-party advertising.

Purevento Antivirenfilter


Areas with high risk of infection

Wherever many people stay longer at the same time - in waiting areas and queues, at meetings and conventions, in narrow passageways or during joint activities close to each other in confined spaces like in gyms - the risk of infection from aerosols in the air containing viruses is particularly high. In these places, even a single infected person can easily trigger an infection cluster (superspreading), since according to current studies the viruses can remain in the air for hours after exhalation and can be contagious. A central component of the hygiene concepts to be approved by the health authorities is effective ventilation.

The Antivirus Filter can be used universally. Optimised roof constructions are available for various areas of application:

Corridor solution

The corridor solution is ideal for creating respiratory protection zones for queues at checkpoints, cashiers or for narrow passages.

A customised installation of several devices in a system network allows large protection zones to be created in which the targeted air flow significantly improves the breathing air locally – even within large halls.


Antivirenfilter: Korridorlösung

Island solution

Breathing through a face mask is tiring in the long run. The island solution is designed to create recreational zones for breathing without a mask in places without suitable access to natural fresh air.

This could be in places with an increased risk of infection where masks are compulsory and where people stay for comparatively long periods, such as in the waiting area at the gate or in shopping centers.


Antivirenfilter: Insellösung

Working principle

Effective ventilation

Effective ventilation is the key to significantly reducing the risk of COVID-19 and other airborne infectious diseases via aerosols in enclosed spaces. It is a central component of all indoor protection and safety measures.

Permanently installed HVAC ventilation systems usually do not have a HEPA filter stage and determine the air quality purely mathematically via the number of air changes of the total air volume in a room during one hour. However, this says nothing about the course of the induced air flows or the distribution of the purified or infectious air flows within the room.

Antivirenfilter Funktionsprinzip
Schematic representation of the air flow on an Antivirus Filter

The antiviral filter creates local respiratory protection zones with high air quality by using HEPA filters and actively guiding air flows:

  • Freshly purified air is discharged directly into the breathing zone
    and thus has no chance of mixing with contaminated ambient air.
  • Exhaled air is continuously discharged downwards
    and directly drawn in by the device to remove virus-containing aerosols.
  • Aerosols containing viruses are effectively prevented from spreading
    directly at the source, removed from circulation and rendered harmless.


Healthcare and economic viability

A safe step towards normal life

In pandemic times, it seems that good health care and a functioning economy are irreconcilable opposites. The Antivirus Filter makes an effective contribution to combining these two elementary foundations of our everyday life.

Healthcare aspects

  • Reducing the risk of infection in closed rooms
    by infectious aerosols with corona viruses, measles and influenza viruses
  • Inhibiting the spread of viruses in the room
    by directly diverting the exhaled air from the breathing zone downwards for immediate filtering
  • Reducing the risk of infection from person to person
    during longer stays together in the same place
  • Complementary infection protection
    on existing safety and hygiene rules against droplet and contact infection
  • Useful addition to permanently installed ventilation systems (HVAC)
    to increase the room cleanliness class in defined zones with high public traffic
  • Additional protection against infection for logistic bottlenecks in passenger transport
    due to procedural or organisational necessities

Economic aspects

  • Proof of effective ventilation
    as a central component of every hygiene concept for obtaining the operating licence
  • Creating essential conditions for the return to economic operation
    through a visible investment in the health and well-being of customers
  • Effective contribution to operational risk management
    as an active preventive measure for occupational safety and health
  • Active reduction of reservations against the use of services in closed rooms
    as a directly visible and tangible prevention measure with accompanying infotainment
  • Flexible solution for adaptation to process changes
    with changing capacity utilisation and dynamic space utilisation or routing (plug & play)
  • Financing through own or third-party advertising
    via integrated info screens


Innovative solution with proven technologies

Effective airflow control with innovative roof construction

The antivirus filter makes use of the principle of low-turbulence displacement flow, which is used in the operating theatre, for example, to create spatially limited virus and bacteria protection zones. The AV-6 Antivirus Filter has a maximum volume flow of 6,000 cubic metres per hour. With its patent-pending design, the Antivirus Filter ensures effective ventilation in danger zones predestined for mass infections.

  • Targeted air flow
    The freshly cleaned air from the Antivirus Filter is released directly into the breathing zone from above. The exhaled air, which may contain infectious aerosols, is immediately discharged downwards and sucked in by the Antivirus Filter.
  • Maximised concentration of purified air in the breathing zone
    Due to the direct release of HEPA-filtered air into the breathing zone, there is a minimal risk of infection from virus-containing aerosols within the protection zone.
  • Minimised spread of potentially infectious aerosols in the room
    The air contaminated by breathing of potentially infectious persons within the protection zone is immediately and continuously discharged downwards and cleaned in the device from viruses and bacteria such as SARS-CoV-2.
  • Minimised risk of infection from person to person
    Because the exhaled air is discharged vertically downwards, the risk of contracting the disease even when staying for a long time next to an infectious person, e.g. in a queue, is minimal.
  • Consideration of the comfort criteria for room air
    The air flow is slowed down homogeneously in the air outlet so that the stay in the breathing protection zones is perceived as pleasant.

Effective filtering of infectious aerosols

The air drawn in is cleaned from viruses and bacteria in a two-stage filter system with integrated disinfection:

  • Filtering of infectious aerosols with HEPA filters
    HEPA filters have the advantage that, in addition to aerosols containing viruses and bacteria, they also filter ultra-fine dust from the ambient air, which can penetrate deep into the lungs and increase susceptibility to respiratory diseases.
  • Increased filter efficiency through fine dust pre-filters
    The upstream Class F7 fine dust filter ensures that the service life of the high-quality HEPA filter is increased and lowers the product life cycle costs.
  • Disinfection of viruses in the device
    In the device, the viruses are deactivated either thermally or with UVC light. Both are proven disinfection methods.


Antivirenfilter Luftstrom




Effective prevention of the spread of virus-containing aerosols and removal with HEPA filters including disinfection


Complementary to
installed ventilation systems
for local protection zones
with high air quality


Minimised operating and maintenance costs through optimised design of the system solution for the respective respiratory protection zone


Installation and operational readiness at short notice with connection possibility to the standard power supply
(plug & play)


Well designed combination of patent-pending innovations and proven technologies with demand-oriented control

Low noise

Alignment of the noise development to local noise levels and limit values

Antivirus Filter



Effective prevention of the spread of virus-containing aerosols and removal with HEPA filters including disinfection



Completion of existing ventilation system installations for local protection zones with high air quality for safer breathing



Minimised operating and maintenance costs through optimised design of the system solution for the respective respiratory protection zone



Installation and operational readiness at short notice with connection possibility to the standard power supply (plug & play)



Well designed combination of patent-pending innovations and proven technologies with demand-oriented control


Low noise

Alignment of the noise development to local noise levels and limit values

Customised solution

Modular and scalable

We offer you a modular, scalable air purification solution to actively reduce the risk of infection for your risk management. For this purpose, we will prepare an air quality concept for local protection zones tailored to the respective area of application in accordance with the regulation of the German Commission on Indoor Air Hygiene (IRK) at the Federal Environment Agency of 12.8.2020 for effective indoor air purification:

  • Exact adaptation of air flow rate to local conditions and room occupancy
  • Exact recording of the air flow and airflow in the room
  • Targeted placement of mobile devices

We will be happy to advise you:


Further questions

How do viruses and bacteria like the corona virus spread?

Leading virologists have found that almost half of the risk of infection is due to droplets that are expelled when breathing and speaking and, to an increased extent, when shouting, singing, sneezing or coughing. They fall to the ground in a radius of 1.50 metres on average.

Aerosols play a major role in the spread of COVID-19. They consist of small virus-containing particles that remain in the air like fine dust, are swirled and transported over long distances. These viruses are contagious for several hours. To become infected, it is sufficient to inhale the virus-contaminated air after the infected person has been in the room. Aerosol transmission has also been documented for measles, tuberculosis, influenza and Sars-CoV-1.

How can the risk of infection via aerosols in the air be effectively prevented?

According to the recommendations of the WHO and the German Robert Koch Institute, face masks help to prevent the risk of infection via droplets and aerosols. However, only FFP2/3 masks, which are mainly used in the medical sector, offer effective protection. In closed rooms effective ventilation is therefore crucial to minimise the risk of infection from aerosols containing viruses in the air.

How well can ventilation systems reduce the risk of infection?

Permanently installed ventilation systems can help to reduce the risk of infection. The more fresh air is supplied, the lower the risk of infection – ideal is 100 percent fresh air. This dilutes the available room air and thus reduces the concentration of virus-containing aerosols in the air we breathe. It is not yet certain what concentration of viruses causes an infection.

The key indicator for air quality in this process is the air exchange rate, which describes how often the entire air volume in a room is to be 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 air pollutants such as CO2 concentration. However, they do not take into account the danger posed by viruses.

Can the infection rate be eliminated with a high air exchange rate?

In the medical sector and in laboratories, where viruses previously had to be considered exclusively, significantly higher air exchange rates of 12 - 15 times per hour apply. According to Lufthansa, this increased air exchange rate is also used in an aircraft.

In addition, HEPA filters are used in the aircraft as prescribed in the medical sector to clean the air and the air flow is guided vertically from top to bottom to remove exhaled virus-containing aerosols from the breathing zone as quickly as possible and to minimise the risk of infection from person to person.

Even a single infectious person may be able to spread enough virus-containing aerosols to infect people in their immediate vicinity or even via the air in the room. The longer the time spent next to a person infected with COVID-19, e.g. in queues or in closed rooms, the higher the risk of infection. In a restaurant without a face mask, there is an increased risk of infection from virus-containing aerosols despite dilution ventilation.

The air exchange rate also says nothing about how the air flows of the supply and exhaust air from the occupied and breathing zones are distributed in the room, i.e. about the ventilation-induced spread 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 as a whole increases and thus the risk of infection.

In pandemic periods of SARS-CoV-2, the usual air exchange rates without defined air flows are not sufficient to adequately reduce the risk of infection with virus-containing aerosols.

How are the viruses filtered out of the air?

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.

An upstream Class F7 fine dust filter ensures a longer service life for the more fine-pored and expensive HEPA filter. We only use certified high-performance filters from renowned manufacturers with international availability.

Are the viruses in the filter inactivated?

In order to ensure the hygiene within the Antivirus Filters, the devices are disinfected thermally from the inside. This also ensures the work safety of the maintenance personnel responsible for changing the filters.

What kind of power connection does the Antivirus Filter need?

The Antivirus Filter requires a standard household 230-volt power connection and can be put into operation immediately.

What are the running costs of the Antivirus Filter?

The running costs consist of the electricity costs depending on the service life 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.

How are Antivirus Filters controlled?

Antivirus Filters can be controlled manually or by remote control via local area networks. As a rule, an automatic operating mode is defined for different periods of time. Sensor-driven control, e.g. via CO2 sensors or people counting sensors, is also possible. The technical key figures are monitored and recorded automatically via telemetry. An alarm function ensures that any malfunctions are immediately known and can be rectified.

Scroll to Top