Oxygen Concentrators and CPAP Machines Difference

What is an Oxygen Concentrator?

An oxygen concentrator is a standalone or portable device that draws in ambient air, filters out the nitrogen, and expels the remaining oxygen as a concentrated gas. The primary function of an oxygen concentrator is to deliver more oxygen than what is available in the ambient air.

What is a CPAP Machine?

A CPAP machine is a standalone device that compresses ambient air to generate pressure for therapeutic purposes. It is widely used at home to treat obstructive sleep apnea (OSA), but it can also be used in emergency settings in a hospital by a respiratory therapist.

• There are 2 main differences between an oxygen concentrator and a CPAP machine:
• The concentration of oxygen in the air flow.
• The amount of pressure flowing through the tubing.
• The primary function of an oxygen concentrator is to increase the percentage of oxygen in the ambient air. A CPAP machine, however, will not increase the amount of oxygen in the airflow it generates.

Oxygen Concentrators and CPAP Machines – Key Differences Explained

Both oxygen concentrators and CPAP machines are used in respiratory therapy — but they serve very different purposes. Understanding the difference helps doctors, patients, and caregivers choose the right device for specific health needs.

How It Works

The concentrator pulls in ambient air → filters out nitrogen → and supplies pure oxygen through a nasal cannula or oxygen mask.
It runs continuously and can support:

• Hospitals: for wards, ICUs, and emergency care)
• Clinics and homes: for patients needing long-term oxygen therapy

Key Features

• Oxygen flow rate: 1–10 LPM (Litres per Minute)
• Oxygen purity: 90–96%
• Continuous oxygen supply (24/7 capable)
• Alarms for low oxygen purity or power failure

How It Works

The CPAP machine pushes pressurized air into the airway to keep it open while the patient sleeps.
It does not supply oxygen, but rather maintains air pressure to prevent airway obstruction. It’s commonly used for:

• Obstructive Sleep Apnea (OSA)
• Snoring or shallow breathing during sleep

Key Features

• Humidifier for comfort
• Mask covering nose or mouth
• Sleep data tracking for doctors