Wet vs. Dry Foggers: What’s the Difference?

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The two most common ways to describe mosquito foggers are thermal and cold foggers. But from time to time, you might hear people use terms like dry and wet foggers. So, we’ve written this article to shed some light on the matter of wet and dry foggers. We’ll explain what they are, how they work, and what the differences between them are.

The Difference Between Wet and Dry Fog

When it comes to dry or wet fog produced by insect foggers, the main difference is the droplet size.

Dry fog usually has droplets that are 10 to 15 microns in diameter. This is because the droplets are so small that they create a seemingly dry fog.

On the other hand, a fog that has droplets that are 20 to 30 microns in diameter is considered wet fog. This fog appears to be wetter and more like a mist than a fog. All fogs whose droplets are above 30 microns are usually mists or sprays, not fogs.

Dry Foggers

So, based on this explanation, wet and dry foggers differ based on the fog they emit.

Most thermal foggers are dry foggers because their mist usually consists of droplets of around 10 microns in diameter. These foggers are perfect when you need to distribute the fog over quite a large area. This is because the smaller particles will be able to diffuse widely and travel quite far thanks to air currents and wind.

The downside to this is that the fog might not thoroughly cover the entire area you wanted to treat. This means that it might be better to fog the area at least two times for more complete coverage.

Wet Foggers

Most cold or ULV foggers can disperse dry and wet fog. Their nozzles allow you to regulate both the spray volume and droplet size within a range of 5 to 50 microns. As long as you keep the droplets small, you’ll get a dry fog (to which the previously mentioned factors will apply).

If you adjust the machine to produce a fog with droplets that are 20 microns or larger, you’ll have a wet fog. These larger droplets are better for applications such as disinfection, mold control, or targeting specific areas with an insecticide. These larger droplets mean that the fog will wet specific surfaces and coat them thoroughly with the chosen solution.


No matter which kind of foggers you use – dry, wet, cold, or thermal – you should experiment to see which droplet size best suits your application purposes. This can also differ based on

  • the weather conditions (very windy places vs. places where the wind is a rarity),
  • the treatment area (indoors or outdoors), and
  • the liquid 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 the different types of foggers, you should find it quite easy to make the right decision as to what type of fogger is best for you.


Steve Caswell

Which is best for office environment please.


    If you have to choose one, then dry foggers would be a better option. Still, it would be a good idea to remove all the papers and everything else that might get ruined if it gets wet.

Lars Lang

Right now, there are many companies offering either dry or wet fogging against Covid-19, and they each say their solution is better than the other? – Is it the chemical that makes the difference or what?
We are talking about indoor areas.
Thanks and stay safe.


    Unfortunately, we are no experts when it comes to this specific matter, as we focus on pest control. However, I would assume different formulas, as well as application methods, do have a different impact on the virus. Still, I’m in no position to determine what conditions (wet vs dry, hot vs cold, what chemicals, etc) would be the best when it comes to getting the job done. Also, a big part of that is probably just a marketing trick to attract customers.


Which is best for COVID 19?


    The new virus isn’t within the area of our expertise. Still, when it comes to disinfecting, ULV foggers might be a better option.

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