How often should oxygen concentrator be serviced?

Related questions

1. Do oxygen concentrators use a lot of electricity?
2. Do you need a prescription for an oxygen concentrator?
3. Can low oxygen cause leg pain?
4. Do oxygen concentrators run out of oxygen?
5. What is the smallest portable oxygen concentrator?
6. Can you drive a car while on oxygen?
7. How much does Inogen oxygen cost?
8. Does being on oxygen make you tired?
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10. How much does it cost to rent a portable oxygen concentrator?

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