Method and apparatus for disinfection

A process for disinfection of a space using a disinfecting liquid droplet spray atomization, in which an electric fan is used to dispense a fog of hydrogen peroxide droplets into the space to be disinfected, comprising:

• modulating the operation of the electric fan in a sequence, the sequence comprising a first phase having a first duration and a second phase having a second duration, wherein in the first phase the fan is operated at a maximum operating speed and in the second phase the fan is operated at a randomly selected operating speed that is greater than or equal to a minimum viable fan operating speed
• calculating a rate of change of a relative humidity of air within a space being disinfected over a predetermined time period during an injection phase in which disinfecting liquid is being injected into the air within the space;
• calculating, based on the rate of change, whether a target relative humidity will be reached at or before an end of the injection phase;
• in the affirmative, continuing the injection phase and setting a duration of a dwell phase to a first dwell phase duration;
• and
• in the negative, determining whether a difference between a measured relative humidity and an initial relative humidity is greater than a predefined threshold value and, in the affirmative, ending the injection phase and setting the duration of the dwell phase to a second, different, dwell phase duration;
• wherein the initial relative humidity corresponds to a relative humidity measurement taken before the start of the injection phase.