Overview Until Now, Oxygen Concentrators Have Been Very Similar - Heavy, Bulky, Noisy, Or Require Frequent Maintenance. But Everflo From Respironics Is A Unique Stationary Concentrator That Delivers The Features Homecare Providers Want And Patients Deserve. Everflo Reduces Operating Costs With A Design That Is: 1. Lightweight - Only 31 Lbs. 2. Smaller And Sleeker. 3. Easy To Store And Transport. 4. Low Maintenance. 5. Quiet 6. Simpler For Patients To Use And Maintain. The Right Fit Everflo Is Part Of The Right Fit, A Complete Portfolio Of Oxygen Products And Programs Inspired By Patients And Built For Business. Features Until Now, Most Oxygen Concentrators Have Been Bulky, Heavy, And Require Ongoing Maintenance By Patients And Homecare Providers. But The 5-Liter Per Minute Everflo Stationary Concentrator From Respironics Has Been Designed With A Unique Set Of Features Providing Oxygen Therapy While Maintaining Ease Of Use For Patients. Lightweight And Easy To Transport At 31 Pounds Compact, Ergonomic Design Takes Up Less Space, Looks Less Like A Medical Device One Of The Quietest Mainstream Concentrators No Homecare Provider Filter Change For Two Years Uses Less Power And Produces Less Heat, So It's More Patient-Friendly No Filters For The Patient To Change Available With And Without Opi (Oxygen Purity Indicator) Warranty : Three Years For Any Manufacturing Defects.