... the N2, CO2,H2O and the impurities, making oxygen accumulated and collected at the end of bed . ... high purity Oxygen . (90~95%)Technical Features1. Only need to supply fan and power for VPSA Oxygen generating system ... to produce oxygen.2. Low energy consumption of equipment, ... for Consumption Oxygen0.36~0.42KWh/Nm3 VPSA Oxygen Generator