Ozone Generator Output 20,000 mg / h of ozone, O3 Air Purifier which effectively eliminate any unpleasant smells like smoke odor, pet odor, basement odor, car odor, new decoration odor, paint fumes and other airborne odors. The timer function can be set up to 0-120 minutes and you can also use the “HOLD” mode to keep it on. Simply turn the timer knob and leave the room, Make sure that no one (and pets) are in the room when the ozone machine is working. Apply the ozone treatment One or two times a week for normal use. If you still smell the residual odor in the room after treatment, please increase the ozone treatment time All ozone generators can only be used in unmanned spaces. Allow 15 to 45 minutes after treatment time is finished before occupying the space, or open the outside windows and doors upon reentry.