Inogen has, without a doubt, the most advanced and most intelligent portable oxygen concentrators on the market.Having said that, we all know that anything mechanical can breakdown and requires routine service and maintenance. When they do, having the best warranty and service upgrade in place for your machine is very important. Below we show all the items that we can cover. These upgrades are exclusive from Main Clinic Supply. We are the only Authorized Inogen Dealer that is also Inogen Service Certified.