We have used oxygen concentrators. These are never old and written off but are at most 3 years old. Be careful when buying from advertisement sites and ask where the unit comes from and let it run for at least 20 minutes.
We have used oxygen concentrators. These are never old and written off but are at most 3 years old. Be careful when buying from advertisement sites and ask where the unit comes from and let it run for at least 20 minutes.