• 11 parts
  • Checked September 2026

Parts of a CPAP Machine

The machine, its hose and a mask, then the mask close up.

Parts of a CPAP Machine

Name Date

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1 2 3 4 5 6 7 8 9 10 11
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Write the name of each numbered part.Answer key

  1. Machine (flow generator)
  2. Hose
  3. Mask
  4. Humidifier chamber
  5. Air filter
  6. Air outlet
  7. Buttons
  8. Power cord
  9. Cushion
  10. Headgear
  11. Exhalation port

Drawn for this site on 2026-09-30 from plain geometry. Licence: own work.

Each numbered ring is a button. Use the arrow keys to move between them and Enter to choose. Names are read out in Study, and once a part is answered.

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All 11 parts on the diagram

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The machine 8

  1. Machine (flow generator) The case holds a motor that blows air into the hose.
  2. Hose The ribbed tube that carries air from the machine to the mask.
  3. Mask It fits over the nose, or the nose and mouth.
  4. Humidifier chamber A tub of water that adds moisture to the air.
  5. Air filter A filter on the air inlet of the machine.
  6. Air outlet The port that the hose pushes onto.
  7. Buttons They turn the blower on and off and start the ramp.
  8. Power cord It brings power to the machine.

The mask 3

  1. Cushion The soft rim of the mask that rests on the face.
  2. Headgear Straps that go around the head and hold the mask on.
  3. Exhalation port Small holes that let breathed-out air leave the mask.

How this list was compiled: Every name checked on 2026-09-30, a name kept only where two of these use it: (1) National Heart, Lung, and Blood Institute (NIH), CPAP, https://www.nhlbi.nih.gov/health/cpap (a mask, straps to position the mask, a tube that connects the mask to the machine's motor, a motor that blows air into the tube; the humidifier chamber); (2) MedlinePlus Medical Encyclopedia, Positive airway pressure treatment, https://medlineplus.gov/ency/article/001916.htm (a mask with a hose to a small machine that pumps air; a humidifier); (3) Wikipedia, Continuous positive airway pressure and Positive airway pressure, text only, https://en.wikipedia.org/wiki/Continuous_positive_airway_pressure and https://en.wikipedia.org/wiki/Positive_airway_pressure (flow generator, hose, mask; a cushion; straps around the head; humidifier and heated water chamber; filters; power supply); (4) three makers' user manuals, read as full text on the Internet Archive and used for names only: a hospital nasal mask guide, https://archive.org/details/manualsonline-id-137e55b3-9006-41dd-a0cc-f779bba79dd7 (mask cushion, headgear straps, vent holes, mask exhalation port, air delivery hose, main air tubing, flow generator); a CPAP and auto-CPAP user manual, https://archive.org/details/manualzilla-id-5744152 (air outlet, filter cap and filter, user buttons, power cord, humidifier, headgear, the vent holes in the exhalation port, the button that turns the blower on and off, the ramp button); a travel sleep apnea therapy system manual, https://archive.org/details/manualzilla-id-5803204 (air inlet and air outlet, filter media, power cord, air delivery tubing or hose, mask cushion, headgear, exhalation ports, two pushbuttons for the blower and the ramp). Licence: own work

The drawing: Drawn for this site on 2026-09-30 from plain geometry; no photograph or plate followed. Licence: own work

How it works

The parts of a CPAP machine are the machine itself, which blows air, a hose, and a mask held on by straps. Two drawings give the names only: eight on the machine and hose, three on the mask.

Read the full guide

Follow the air

Room air enters through the air filter. Inside the machine a motor blows it on, through the humidifier chamber and out of the air outlet into the hose, which ends at the mask. The buttons and the power cord are on the machine. On the mask, the cushion is the soft rim, the headgear is the set of straps, and the exhalation port is the row of small holes.

  • Flow generator is the name makers give the machine.
  • This page names parts only. It is not medical advice.

Questions and answers

What are the main parts of a CPAP machine?

A machine with a motor that blows air, a hose, and a mask with straps. Some machines also have a humidifier, and makers' manuals name an air filter, an air outlet and a power cord.

What is the hose on a CPAP machine called?

Makers call it the air tubing or the air delivery hose. It joins the air outlet of the machine to the mask.

What are the holes in a CPAP mask for?

They are the exhalation port, also called the vent. The holes let air flow out of the mask all the time, which carries breathed-out air away.

What is the humidifier chamber on a CPAP machine?

A tub of water joined to the machine. It adds moisture to the air from the machine before the air goes down the hose. Some are heated.

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