The two most common ways how one describes mosquito foggers are thermal or cold foggers, but from time to time terms like dry and wet foggers are also used. So this article will shed some light onto the matter of wet and dry foggers – what they are, how they work and what is the difference between them.
The main difference when it comes to dry or wet fog produced by insect foggers is the droplet size of the fog. Usually fog that consists of droplets that are 10 to 15 microns in their diameter is characterised as dry fog, because the droplets are so small that they create seemingly dry fog hence the name. Whereas fog that consists of droplets that are 20 to 30 microns in their diameter are characterised as wet fog, because it appears wet and more spray or mist than fog like. All fogs that consists of droplets above 30 microns usually are characterised as mists and sprays, not fogs.
So based on this explanation wet and dry foggers differ based on the fog volume they emit. Most thermal foggers are dry foggers because their mist usually consists of droplets of around 10 microns in diameter. These types of foggers are best applied in cases when you need to distribute the fog and the insecticide that is used to create the fog in quite wide area, because the small particles will be able to diffuse widely and travel quite far with the help of air currents and wind. The downside to this is, that the fog might not toughly cover all the area that is fogged, which means that it is better to fog the area at least two times for more complete coverage.
Most cold or ULV foggers have the ability to disperse dry and wet fog, because they feature nozzles that allow you to regulate the spray volume and droplet size from 5 up to 50 microns. As long as you keep the droplets small, you will get dry fog and the previously mentioned factors apply to the fog, but if you adjust the fog to have 20 micron droplets and bigger, then you will get a wet fog. Wet foggers emit larger droplets, and therefore are better used for applications such as disinfection, mold control or targeting specific areas with insecticide, because larger droplets mean that the fog will wet specific surfaces and coat them thoroughly with the solution you are using.
No matter which kind of foggers you use – dry, wet, cold or thermal foggers, you yourself should do some experiments and see which droplet size best suits your application purposes. This can also differ based on weather conditions (very windy places or places where wind is a rarity), area that is fogged (indoor or outdoor area) and liquid that is used (water or oil based solutions). When you take into consideration all these factors and merge them with the knowledge of dry and wet fogs and different types of foggers, you should find it quite easy to make the right decision as to what type of fogger is best suited for you.