Technology
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
Methods
AVISNA nebulisation
UV
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
Partial
None
None
Complete for previous microbiological contamination
Efficiency
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
Compatibility
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
Incompatible
Costs
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
Nebulisation
Advantages
​
-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
​
Disadvantages
-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
Advantages
​
-Targeted
-Conventional
-No electricity consumption
Disadvantages
-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
Advantages
​
-Avoiding chemicals
-An alternative to classic wipe disinfection
Disadvantages
-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.