How to Choose a Portable Oxygen Concentrator

Key takeaways

• The oxygen concentration figure (33% vs 90–93%) matters more than anything else: it is the difference between light enrichment over room air and high-concentration oxygen.
• Continuous flow (what all Long Breeze machines deliver) is simpler and fine for rest and overnight. Pulse dose stretches battery life but needs a steady breathing pattern.
• If you are managing a diagnosed condition, the machine and the flow rate are your doctor's decision: these units are sold as general wellness devices, not prescription equipment.
• For pets, the concentrator is only the oxygen source; the care plan comes from your vet.
• Match weight and battery to how you will actually use it: carried versus bedside, on-grid versus off-grid.

Lightweight 33%View machine →NT-5 33%View machine →Battery-Powered 93%View machine →SH-O1, built-in nebulizerView machine →SH-O5, 10-inch screenView machine →

1. Start with oxygen concentration

Room air is about 21% oxygen. Concentrators are sold in two broad tiers:

• Around 30–40%: light enrichment above room air. Used for travel, general breathing comfort, and altitude adjustment.
• Around 87–96%: high-concentration oxygen, near the purity of prescribed home oxygen, without a prescription.

The gap between 33% and 93% is bigger than any difference in weight, noise, or price. Full explanation: what oxygen concentration actually means.

One caveat: the delivered concentration usually drops as you turn the flow rate up. A machine rated “93% at 1 L/min” is not 93% at 5 L/min. Every Long Breeze product page lists the honest range.

2. Continuous flow vs pulse dose

Continuous flow is a constant stream of oxygen-enriched air. It works no matter how you breathe, it is simple, and it is fine for reading, resting, and sleeping. It uses more battery. All Long Breeze machines are continuous flow.

Pulse dose detects the start of each breath and delivers a burst. It extends battery life and shrinks the unit, but it depends on a consistent breathing pattern and is generally not recommended unattended overnight. More: continuous flow vs pulse dose.

3. Do you need a prescription?

Long Breeze machines are sold as general wellness devices: you can order without a prescription, and they are not FDA-cleared medical oxygen equipment. If a doctor has diagnosed you with low blood oxygen (COPD, pulmonary fibrosis, sleep-related desaturation), the right device is a prescribed one, chosen with your clinician, who also sets your flow rate. See the product disclaimer.

4. Weight, battery, and noise

• Weight: the machines for people run 3.3–4.8 lb. If you will carry it daily, the 3.3 lb Lightweight 33% is the one. If it lives on a table, weight matters less.
• Battery vs cord: only the Battery-Powered 93% runs without a wall socket. If every place you will use it has an outlet, a corded unit is lighter and cheaper.
• Noise: the quietest models are rated around 48–52 dB (quiet conversation). This matters most for a bedside machine.

5. Flow rate

Flow is measured in litres per minute (L/min). The Long Breeze range covers roughly 1–7 L/min depending on model. Higher is not automatically better: it drains battery, can dry your airways, and lowers delivered concentration. For wellness use, most people sit at the low end.

6. Choosing for a pet

The veterinary units are the oxygen source for home or clinic care of dogs, cats, and small animals. Everything else (whether oxygen is appropriate, the flow rate, an oxygen cage versus a mask, how long per session) is set and supervised by your veterinarian. Background: oxygen support for dogs and cats. The SH-O5 goes down to 0.5 L/min, which is why it is the better pick for very small animals. For the full buying-criteria breakdown, see best pet oxygen concentrator.

7. The Long Breeze range, side by side

Shop all machines · For people · For pets

Still not sure?

Call 1-786-658-5217, Monday–Friday 8am–8pm ET. Tell us how you plan to use it and we will point you at the right machine, or tell you if it is not the right category for you.

Also read: nine questions to answer before you buy and cleaning and filters: the whole routine.

Health information here is general and not a substitute for advice from your doctor or veterinarian. See our product disclaimer.

Related: oxygen generator vs oxygen concentrator: what each term means.