The AVISNA nebulisation system for air disinfection is suitable for highly efficient inactivation of corona viruses in the room air in the presence of people:

•    Disinfecting aerosols float in the room air for hours after ultrasonic fine nebulisation

•    Automatic and uniform distribution in the room air due to Brownian molecule movement

•    Long-term protection and immediate inactivation of infectious aerosols

•    Also effective against corona variants and other viruses (flu) as well as bacteria

•    High body compatibility, therefore usable when people are in the room

Proof Efficiency

Laboratory tests at the University of Leipzig showed that the system is capable of inactivating high corona pathogen concentrations by 99.9% following short-term nebulisation:

Conclusion: “The experimental setup allowed the investigation of high pathogen concentrations in the air and the assessment of the reduction by the AVISNA nebulisation system. As a result, we were able to show that the infectivity of the feline corona viruses in the air could be completely inactivated. Under test conditions, we were able to demonstrate a titer reduction, i.e. a depletion by more than 3 log10 levels in some cases.”

Prof. Dr. Uwe Truyen, October 2021

Comparison to HEPA filters


 HEPA filters can reduce the aerosol concentration by about half after 10-15 minutes of operation in a classroom, according to surveys by Fraunhofer ITEM (12.10.2021). Similarly, one can estimate the effect against newly exhaled infectious aerosols by an infected person in the room.

 AVISNA disinfectant aerosols can act immediately on the newly created infectious aerosols and inactivate them by 99.9%.

AVISNA nebulisation can wet and co-disinfect infectious surfaces in the room; HEPA filters cannot.

Comparison of Different Methods of Air Disinfection
AVISNA nebulisation
HEPA Filter
H2O2 Fogging

Room air disinfection

Hours of inactivation in an entire room full of people

Short-term by inactivating partial air flow

Short-term by filtration of the partial air flow

Only previous inactivation without humans, no current protection for humans in the room

Room size restrictions

Also suitable for large buildings and arenas

Suitable for rooms up to 300 m²

Suitable for rooms up to 300 m²

Suitability for large rooms

Surface disinfection




Complete for previous microbiological contamination


Immediate inactivation of viruses in the whole room with people
Reduction of virus load in the room regularly 99.9% during room use

Step by step inactivation / dilution only in the UV unit,
Reduction of virus load in the room by up to 50% during room use

Stepwise filtration/dilution only in the HEPA filter
Reduction of virus load in the room by up to 50%,
during use of the room

Hours of exposure for thorough inactivation
Reduction of virus load in the room up to 99.999% before room use


High, without irritation or allergy

High, watch out for ozone formation and UV scattered light

High, pay attention to noise pollution, hygiene when changing filters



Inexpensive, low follow-up costs

Inexpensive, low follow-up costs

High, high follow-up costs

Very high

Environmental compatibility

High, uses of the same active substance as in the human body, not a hazardous substance

High, make sure that the UV lamps are disposed of in an environmentally friendly way

High, pay attention to hygiene when disposing of the filter elements

Low, H2O2 is a hazardous substance

Comparison of Different Methods of Air Disinfection

-Very time-saving, especially for large rooms with many objects, e.g. hospitals or doctors' surgeries, old people's or nursing homes, food industry, cinemas, theatres, supermarkets, schools, kindergartens, etc.

-Fast, (automated) disinfection, suitable as a virus barrier at building entrances

-Efficient, uniform 3D wetting of all surfaces, even in places that are difficult or impossible to reach by hand, e.g. top or bottom sides of furniture, everywhere where dust and aerosols are present
-Disinfection of surfaces that cannot be wet-wiped, e.g. upholstered furniture, bed (linen), books, files, etc.
-Simultaneous disinfection of all surfaces and the room air, avoidance of aerosol infection through “super spreaders”
-When using the natural AVISNA active ingredient: body-compatible, virucidal, bactericidal and fungicidal  



-Special disinfectants required, produce yourself on site at low cost with AVISNA or buy ready-made solution in bottles
-Residual salt crystals (NaCl) visible as residues following evaporation after weeks/months
-Limitation of disinfectant concentration in room air useful for harmless continuous contact with people
-Higher concentration only applicable without presence of people.

Spray and Wipe Disinfection

-No electricity consumption


-Many places and surfaces in the room inaccessible or difficult to reach
-Inconsistent, uneven distribution of the disinfectant, no certainty of effectiveness against all germs
-Only suitable for surfaces that are persistent to wetness

UV Room Disinfection

-Avoiding chemicals
-An alternative to classic wipe disinfection


-Severe eye damage in case of eye contact
-Beam intensity and thus effect decreases with increasing distance
-Shadow formation not always avoidable, e.g. top of cupboards, bottom of beds, etc.