Sonozaire Model 330A is constructed of heavy-duty aluminum. Industrial ozone generators are designed to be used in uninhabited areas, or used at volumes that are limited by OSHA or EPA regulations. Model 330A allows users to adjust the ozone output according to the level of odor and the desired duration of treatment. Equipment is designed for 115 volt, 50/60 hz, single phase AC only. Optional 220-240 volt, 50/60 hz, single phase is available.