This unit is perfect for sanitizing and deodorizing large areas such as hotel siutes, offices, homes, basements, and more. It will eliminate even the most severe odors caused by mold, mildew, bacteria, viruses, tobacco, animals and more. It has a variable ozone output and a 12 hour timer with a constant on (hold) option. Larger unoccupied areas may be treated when unit is left to operate for a longer period of time with the appropriate circulation and movement of the unit within the area. Ozone output wll vary based on temperature, humidity and altitude.