A: Yes, there are several portable oxygen concentrators that provide continuous flow settings. Examples include the GCE Zen-O, O2 Concepts Oxlife Independence, Caire Sequal Eclipse 5, and Respironics SimplyGo.

A: It is possible to use a humidifier with a continuous flow portable oxygen concentrator (POC). However, the POC can only be used in continuous flow mode. If a humidifier is used while in pulse mode, water can be sucked into the machine and cause damage to the circuit board and other parts.

A: Yes, with a prescription for oxygen, you can purchase your own portable oxygen concentrator.

A: Yes, if your portable oxygen concentrator has a continuous flow option, it can be used in conjunction with a CPAP by using an oxygen enrichment adapter (also called a bleeder adapter).

A: Yes, there are service centers around the country qualified to repair many brands of portable oxygen concentrator. In many cases, you can purchase and replace the sieve canisters yourself.

A: A number of portable oxygen concentrators now have sieve canisters that can be replaced by the user. However, any other repairs should be done by a certified technician. Attempting your own repairs will usually void your warranty.

A: Portable oxygen concentrators range in weight from 4 lbs to 18 lbs. The larger models usually have continuous flow options, while the smaller units tend to be pulse delivery only.

A: The cost of a new portable oxygen concentrator ranges from $1500.00 to more than $5000.00.

A: Most manufacturers say that tubing up to 50 feet is acceptable. Tubing longer than 50 feet can reduce efficiency and is more likely to present a tripping hazard.

A: When the charge on the battery of your portable oxygen concentrator is very low, the compressor machine may have difficulty both charging the battery and providing oxygen therapy with the power provided by a DC car charger. A good solution is to carry extra batteries for longer outings and charge your batteries when you have access to AC power.