December 21, 2020

Why humidity prevents virus spread

why humidity prevents virus spread

With the current situation, everyone is searching for the best ways to reduce the risk of getting the virus. At IKEUCHI, we aim to provide the best support with our humidification products.  Humidification helps a lot with preventing the virus from spreading in an indoor location. Here we will talk about why humidity prevents virus spread.

Humidity matters

Did you know that when air humidity is lower than 30%, the amount of droplets spread is doubled in comparison to 60% or higher?

In Japan, Riken and Kobe University conducted an research by using a super computer to see what the effects of humidity are towards the virus. This test has been taken in a room where there was no window ventilation. By using a simulation run by the supercomputer Fugaku, the researchers could see what effects humidification has on the spread of droplets when sitting in a diner.

  • At 30% or lower humidity level with a distance of 1.8 meter, all droplets of a person who coughed travel to the person sitting on the opposite side of the diner table. Which would end up in a transmission of the virus if the person was infected.
  • While at 60% or higher humidity level, most of the droplets released by the coughing person will drop down and not travel towards the opposite side. The higher level of humidity suppress the contaminated droplets to the ground, reducing the spread and the risk of transmission.

This showed that humidification has indeed an effect on the spread of the potential infectious droplets from a person (Source: Reuters). However, it is important to noted that with a too high humidity level (close to 100% relative humidity), mold can grow which is also unhealthy. Therefore, it has been studied that the best relative humidity level to have indoor is between 40~60%. But increasing the humidity level itself is not sufficient to prevent the transmission of the virus. As any other winter viruses, it is important to also maintain a good air ventilation to renew the indoor air within a closed room.

To see the simulation images, click on the link below from the NHK WORLD-JAPAN video. The simulation images show that when the humidity level of a room is increased to 60%, more than double the amount of airborne particles (droplets) are suppress to the ground compare to air humidity of 30%. The size of each water droplets (humidity) weight the viral particles in the air to the ground. This is why humidity prevents virus spread.

How can IKEUCHI help?

As “The Fog Engineers”, we develop spraying systems to be used for humidification purposes. Our most iconic product, the Dry Fog Humidifier “AKIMist®”, is a humidification unit but can also be used for disinfection. By using compressed air together with purified water (RO water), the AKIMist® is able to create very fine fog without any leakage. Furthermore, at a distance of 2 meters the water droplets produced by the AKIMist® are so small that it does not wet the surrounding objects and the environment. Therefore, it is called “Dry Fog”.

To read more about how our products can also be used for disinfection purpose, you can also take a look at the following article which goes deeper into “Dry Fog” and our humidification products:

Efficiency of disinfection and droplet size

Disinfection with our Dry Fog humidifier

To know which model is the more adapted for your utilization and the chemical liquid you want to spray, please contact one of our engineers. However, we do not provide the disinfectant liquid to spray. We will find the best solution of spraying system for your application. We are available from Monday to Friday, from 8:30 – 17:00.

Contact us to know more about our products.

Christopher Hiraki – IKEUCHI EUROPE B.V.