Our office was recently cursed with a double-whammy. A strong storm had blown a significant amount of rain under the front door, soaking the carpet on a Friday night. By Monday morning, the smell of mold from the damp carpet had permeated the whole office. On top of that, some animal(s) had died and was decomposing in either the walls or above the drop ceiling in the structured-steel office building, and the foul odor of death was being circulated throughout the office by the HVAC. It was so bad that our entire office was vacated to work from home for several days while we dealt with the sickening miasma permeating our workspace. We had the carpet professionally shampooed and disinfected, but by then, the mold odor was in everything - and mixed with the odor of decomposition, it just wouldn't go away.Enter this ozone generator FTW! We sectioned off our 2,800 sq. ft. office and treated individual rooms and the HVAC system over a series of nights, starting with the worst-affected areas. We ran at full power for 2 hours in each closed room x 4 main areas. We re-treated again in the specific areas where the smell of decay persisted a day or two later. As the only non-smoker in the office, I noticed that in addition to eliminating the mold and decay odors, the ozone treatments had also eliminated the odors of cigarette smoke that had for years persisted near doorways and in upholstery. After that, I also treated a vehicle at about one-third to half-power for 1 hour, then let sit closed in the sun for a few hours before opening up all the windows to vent the vehicle's interior, and it eliminated the smoker's odor that had permeated the interior previously. A couple shots of "new car smell" Febreeze to the floor mats and it was actually pleasant to ride in again.Conclusion: This unit is well-built, easy to use, and most importantly... EFFECTIVE. We went with this model at higher cost than some competing units because of the adjustable output - which makes it easy to dial-in treatment of whole offices to small car interiors or closet spaces with the same unit. Highly recommended!