1st Class Medical is the largest distributor of home and portable oxygen concentrators with multiple offices across the United States. Our parent company, North Florida Medical, has been in the oxygen business for over 35 years! We sell name-brand FAA and FDA approved oxygen concentrators and we are the preferred dealer for every major manufacturer including; Inogen, Philips Respironics, AirSep, O2-Concepts, SeQual, and more!