AirSep Oxygen Concentrators AirSep Freestyle 3 Oxygen Concentrator Capable of producing up to 1,000 mL/min of medical grade oxygen and weighing in at only 2kg. Learn More $3,995.99 AirSep Freestyle Comfort Concentrator With it's lightweight, curved design hugs your body, so you’ll hardly know it’s there. Learn More $5,495.99