DeVilbiss 5 Liter Stationary Oxygen ConcentratorFeaturing a variety of enhanced safety and performance features, combined with DeVilbisss exclusive turn down technology, the DeVilbiss 5 Liter Stationary Oxygen Concentrator produces a 1 5 LPM flow rate with a 93%+ 3% purity rating while using at least 15% less power than other comparable units, which saves patients an estimated $100 in annual electrical costs! This unit also features a new and improved fireproof 2 piece cabinet design with easily