The respironics ‘EverGo’ is a good option if you’re particularly mobile- the battery life depends on flow, ranging from 12 hours on 1 to 4 hours on 6, averaging at 8 hours on 12, which is excellent, and a large benefit is that it’s one of the few concentrators that you can take on airplanes, which means you don’t have to go through the hassle of arranging oxygen with (and paying extra for) an airline. With two batteries, it’s about 10 pounds, and with one battery, it’s a pound less.
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http://www.oxygenconcentrators.org/about.html
if you like masks then nonrebreather at 15 liters per minute or if you don’t then a nasal canula at 6-8 liters per minute.
The respironics ‘EverGo’ is a good option if you’re particularly mobile- the battery life depends on flow, ranging from 12 hours on 1 to 4 hours on 6, averaging at 8 hours on 12, which is excellent, and a large benefit is that it’s one of the few concentrators that you can take on airplanes, which means you don’t have to go through the hassle of arranging oxygen with (and paying extra for) an airline. With two batteries, it’s about 10 pounds, and with one battery, it’s a pound less.