Fogs can be administered through ultralow-volume (ULV) or electrostatic (ES) foggers. They can achieve high levels of airborne and surface decontamination (up to six log reductions in some cases, but four log reductions are common).
Fogging is effective against a wide range of bacteria, viruses, fungi and spores depending on the disinfectant used. Professional fog generators produce fine mists in significant quantities for maximum impact; high concentrations of fine fog remain in the air to give effective disinfection times. Fogging is very effective, swift, and relatively inexpensive.
There is a broad range of cleaning chemicals that can be applied to surfaces; only some are compatible with fogging. The top two reasons are as follows:
Viscosity: Fogging relies on a known particle (droplet) size being formed in the mist; too fine it dries in the air, too large it falls as rain. The size and shape of the particle are driven by the viscosity of the liquid used and the resulting drop size that is created by surface tension in the mist formation nozzle — one of the aspects that is impacted by dilution of the chemical, so it’s critically important.
Adiabatic changes: The fogging process has a pressure and temperature change at the nozzle. Many things can go wrong with a chemical mixture: some chemicals fall out of solution; some create temperature changes that result in ice; some crystallise and block the nozzle. The process is widely used, but the chemistry and physics at the nozzle are very complex — so some chemicals work, others don’t.
For more information: https://www.viruscontrol.com.au/fogging/.
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