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What is airborne disinfection?


This is a new way of disinfecting volumes, rooms and installations by creating a fog which will diffuse in an enclosed space and will contact all surfaces.

This so called terminal disinfection should take place after cleaning sensitive areas, and enables the disinfection of hard-to-reach areas (high-up surfaces, hidden or even normally closed areas).

This method should only be used when the room has been vacated (so there is no risk to the user) and can be planned to take place during out of hours time (at night for example, so there is no waste of time).

The spinning disc technology


The principle: feeding of a liquid fed by a peristaltic pump, to the under side of a disc spinning at very high speed, between 45,000 and 60,000 revs/min.

Disque diffuseur Phileas
3D illustration of the Airborne Disinfection Phileas system’s diffusion disc

The resulting fog is then extracted, using a fan, and removed from the influence of the centrifugal force in the diffusion head. This process and equipment is compatible with the diffusion of hydrogen peroxide based products.

Advantages


  • Simplicity of concept
  • No nozzle or air compressor
  • Accurate droplets between 5 and 10µm
  • Constant flow rate
  • Low energy consumption

Benefits


  • No risk of nozzle blockage
  • Low noise
  • No vibrations
  • Precise quantity control of diffused disinfectant
  • Battery operated, autonomous operation option on smaller devices within the range
  • Reproducible efficiency
  • Very low maintenance

The equipment/chemical product combination system


The study of available processes and useable formulas shows that the efficiency of disinfectants depends on the chosen diffusion process.

As such, the manufacturers of disinfectant products for airborne sanitising validate the efficiency of their formula with a chosen process, and therefore offer a process/product combination.

Hydrogen peroxide based biocides, for example, have a better efficiency when they are diffused in very fine droplets (between 5 and 10µm). This also enables a reduction in the content of active ingredients, whilst retaining the desired efficiency.

Which standards governs this mode of disinfection?


The AFNOR NF -T 72 281 version 2009 Norm details the validation method for bactericidal, fungicidal and sporicidal disinfection by airborne means.

This validation must take place in a space of 30 to 150m³. The test method utilises Biological Indicator of standard microbiological cultures on stainless steel supports, each test piece located at a height of 1m and at a distance of between 3 and 4.20m from the equipment, depending on the volume of the test space.

The contact time is left to the user to determine, as long as it is less than 12 hours. This contact time will be reported as part of the test results.

The reduction rate in micro-organisms populations attained to pass the test is of:

  • 5 logarithms for bactericidal disinfection (99,999% mortality)
  • 4 logarithms for fungicidal disinfection (99,99% mortality)
  • 3 logarithms for sporicidal disinfection (99,99% deactivation)
  • DEVEA : Airbone disinfection by spinning disc technology
  • H2O2 diffusion
  • DEVEA Phileas can be use in smalls and larges areas