California Code of Regulations
Title 17 - Public Health
Division 3 - Air Resources
Chapter 1 - Air Resources Board
Subchapter 8.7 - Indoor Air Cleaning Devices
Article 1 - Indoor Air Cleaning Devices
Section 94803 - Exclusions and Exemptions

(a) Industrial use: The provisions of this article do not apply to indoor air cleaning devices manufactured, advertised, marketed, labeled, and used solely for industrial use as defined in Section 94801(a)(19) above, provided the devices display an advisory that states: "For industrial use only. Use only in unoccupied spaces. Health hazard: emits ozone." This advisory must be clearly visible and placed near the power switch or electrical connection on the device. A graphic illustrating that people should not be present during use of the device is also required to be placed next to the text. The advisory also must be prominently displayed in all owner's, operations, and installation manuals for the device(s) and on all marketing materials, including websites. Information about potential adverse health effects associated with exposure to ozone must be included in all owners, operations, and installation manuals for the device(s).

The owner's or operations manual must include a recommendation that any enclosed space in which ozone-producing air cleaners are used should be well-ventilated for at least one hour before being re-occupied.

Manufacturers, distributors, sellers, and retailers of ozone generating air cleaning devices must be able to demonstrate that devices are manufactured, marketed, advertised, and labeled solely for an exempted purpose(s).