... below 42dBA (standard type:3, 4, 5L/min)*Low adsorption pressure (about 0.15 Mpa)*Alarms: power failure, high and ... Class II Type BSafety Alarms & Features Power Failure, High Pressure / Low Pressure, Low Oxygen Concentration, Temperature, Current overload or line ... surge shutdown, Thermal Switch, 40 psig Pressure Relief ValveNebulizer Particle Median Diameter≤5μm, Percent: 90%, ...