1The generator is durable, with a long working life.2.There are models for choice. Air source and oxygen source. ... factories and workshops, especially in chemical industry.Construction: Generator, stainless steel cover,high-grade quartz tube,ampere ... h100*50*120220V50-60Hz30-8080-120M 2800SourceOxygen source (Oxygen generator / bottled oxygen) or clean dry airOzone ConcentrationOxygen Source25-50, Air ...