At first glance, it might seem like the Everflo and the Everflo Q look like the same stationary concentrator. Although they are very similar, there are still a few key differences that will make an impact on whether or not each one is right for you. They are both low maintenance and small and a great choice for those who need to use oxygen at home. These are both stationary oxygen concentrators, which means they run on AC power only.
The Respironics Everflo Q
The Everflo Q was sold as being one of the quietest stationary oxygen concentrators on the market, for the oxygen capacity. It's only as loud as 40 decibels and goes up to 5 LPM (liters per minute) of continuous flow, in 0.5 increments.