The VirBuster 4000 ozone generator has an output of 3500 mg O3 per hour and is suitable for disinfecting smaller areas. It is best used in an apartment , a smaller office, or when disinfecting motor vehicles . It can clean the car's interior in half an hour, or an area of about 30 m2 in an hour. Model VirBuster 4000A is controlled by a mechanical timer, model VirBuster 4000E by an electronic timer with a bargraph of the process.