We recommend one unit per 50m2, and its location will depend on the air currents, but a height of 1.5 m from the floor or on the ceiling is the appropriate place to take advantage of the dispersion of the chain reaction of radicals throughout the environment. For decontaminating larger areas, there are devices designed for this and a detailed study is usually required, as it is important to identify the flow and air currents, and sources of pollutant emission.