Atlas Copco DB Series Side Channel Blowers.>DBS>Single Stage, Single Impeller>DBSt>Single Stage, Double Impeller>DBD>Double Stage, Single Impeller>DBDt>Double Stage, Double ImpellerFlow rate: 74 m3/hr to 1995 m3/hrVacuum: -180 mbar to -500 mbarPressure: 0.18 bar to 0.5 barATEX Zone II available on request