Graham Field Patriot Homecare Beds Semi Electric 1 Each Bed:1633 Rolled Foam Mattress and Full Chrome Rails 000 ft FAA Approved Yes Size:7.5 000 ft FAA Approved Yes FAA approved label visible on device Oxygen Concentration Purity 90% 3% +6% at all settings Warranty 3 Years (1 Year on Pre Owned Units)Please note Any smoking while using the unit or evidence that unit has been used in a smoke filled environment will void the warranty Easy Breathe EPR reduces the work of breathing during exhalation providing a gentler pressure that naturally adapts to your breathing cycle throughout the night Introducing the new Patriot Semi Electric Homecare Bed with a grid sleep surface Easier to clean