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A function almost nobody uses
Your device can measure whether your mask leaks, and tell you in thirty seconds. The function is called Mask Fit, it exists on the AirSense 11 and the AirSense 10 alike, and most patients have no idea it is there.
It saves you finding out in the morning, after a poor night, that your mask was badly positioned. You check it before bed, while awake, with time to adjust.
How it works
The device blows air while you wear the mask, measures how much escapes, and gives a verdict. On the AirSense 10 that verdict takes the form of a smiling face when the seal is good.
Running Mask Fit on a ResMed AirSense 11
On the AirSense 11 the function lives in the MORE menu, not in MY OPTIONS.
- Put your mask on and adjust the headgear as you would for sleeping.
- From the Home screen, tap MORE.
- Tap Mask Fit.
- The device blows air. Readjust the mask, the cushion and the headgear while it does.
- Stop the test once the result is good.
Running Mask Fit on a ResMed AirSense 10
On the AirSense 10 the function sits directly in My Options, and the result appears as a face.
- Fit your mask as described in its user guide.
- From the Home screen, turn the dial to My Options, then press.
- Turn to Run Mask Fit, then press.
- The device starts blowing. Adjust the mask, the cushion and the headgear until you get Good.
- Press the dial or the Start/Stop button to end the test.
What to do if the result stays poor
A test that refuses to turn green despite your adjustments is telling you something useful. Work through this order.
The headgear is too tight
This is the most common reflex and the most counterproductive. Overtightened headgear deforms the silicone cushion, which then loses continuous contact with the skin. Loosen off, then tighten gradually while the device blows.
The cushion is worn out
A cushion that is deformed, sticky or dulled no longer holds a seal, whatever you do with the headgear. Plan on a replacement every one to three months depending on the mask type.
The size is wrong
If no tension gives a good result, it is often a cushion size question. Our CPAP mask sizing guide explains how to measure.
The mask type does not suit you
Some faces simply do not get on with a given type. A nasal pillow mask holds poorly on very wide nostrils, a nasal mask seals badly over a thick beard. See our guides on CPAP masks and beards and on choosing a mask.
When to run the test again
- With every new mask, obviously
- With every cushion change
- After a notable weight change, since facial shape shifts
- As soon as your night data shows leaks trending up
- If you wake with deep marks or irritated eyes
Read more
- CPAP mask leaking: causes and fixes
- CPAP mask sizing guide
- How to choose your CPAP mask
- Cleaning your CPAP mask
All our settings tutorials
Each tutorial gives the procedure for both the AirSense 11 and the AirSense 10.
- Setting the ramp
- Setting humidification and tube temperature
- EPR and SmartStart: what you set yourself
- Cleaning and maintaining your device
- Replacing the air filter
- SD card, myAir and therapy data
- Turning on airplane mode
Frequently asked questions about the mask fit test
Around thirty seconds is enough in practice. The device blows continuously until you stop the test, which gives you time to adjust the headgear and watch the result change live.
No, the two complement each other. Mask Fit measures the seal at one moment, still and awake. Overnight tracking in myAir or OSCAR shows what actually happens when you move around and change position.
That is common and logical. Lying still, the mask holds. As soon as you turn your head or press the mask into the pillow, contact breaks. Look at your sleeping position and the mask type instead.
No, that is the classic trap. Past a certain point, tightening further deforms the cushion and makes the leak worse rather than better. The right method is to loosen completely, then tighten in small steps while the device blows.
On the AirSense 10 and 11, yes, and it is available without any provider involvement. Other brands often offer an equivalent under another name. Check the manual supplied with your device.
Once you have checked tightness, cushion wear and size, what remains is the mask type. Some faces do not get on with a given model. Write to us describing your mask and your problem, and we will point you somewhere better.