Vertical Mini 20k kill levels All Questions › Category: Ozone Generators For Business › Vertical Mini 20k kill levels 0 Vote Up Vote Down Charlie asked 5 years ago How long would it take for the Vertical mini 20k to reach kill levels for a car, and bus? 1 Answers 0 Vote Up Vote Down Team Ozone Staff answered 5 years ago ShareUse an ozone meter to find out. They are both different sizes it will be different times for different cubic feet of space. You need to hold it at 5 ppm for 20 to 30 mins from our testing. In service, Charlles Share