Comparison
AirFit F40 or AirFit F30i?
Two compact ResMed full face masks that sit under the nose. The real difference is the tube: in front of the face on the F40, on top of the head on the F30i, which matters a lot if you sleep on your side or move around.
Updated September 14, 2026
A compact full face mask under the nose
A compact full face mask that covers the mouth without touching the bridge of the nose, with three cushion sizes and three headgear sizes. With its QuietAir vent ring, ResMed declares 13 dBA at one metre.
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Under-the-nose full face, top-of-head tube
A compact full face mask whose cushion sits under the nose, with the tube connecting at the top of the head. ResMed presents it as allowing you to sleep in any position.
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Side by side
Data published by the manufacturers. Rows that differ come first.
| Specification | AirFit F40 | AirFit F30i |
|---|---|---|
| SizesDiffers | S large, M, L | S, M, S large, Large |
| Declared noiseDiffers | 13 dBA at 1 m · 20 dBA sound power | 18 dBA at 1 m · 25 dBA sound power |
| Top-of-head tubeDiffers | No | Yes |
| Cushion material | silicone | silicone |
| Magnets | Yes | Yes |
| Nose bridge | Free, the mask does not touch it | Free, the mask does not touch it |
| AirMini compatible | No | No |
Which one for you?
Rather the AirFit F40 if:
- Mouth breathers
- Sensitive nose bridge
- Noise-sensitive bed partners
Watch out for
- Magnets: contraindicated with some implants, see the warning
- Not compatible with the AirMini according to ResMed
- Pressure range limited to 30 cmH2O
Rather the AirFit F30i if:
- Mouth breathers
- Side or restless sleepers
- Sensitive nose bridge
Watch out for
- Magnets: contraindicated with some implants, see the warning (non-magnetic version available)
- Not compatible with the AirMini according to ResMed
CPAP Ranker analysis, written from the manufacturers' documents. It is not a patient review and does not replace your equipment provider.
At least one of these masks contains magnets. Manufacturers advise against them if you or your bed partner have certain medical implants. The full warning and its source are on the page of each mask concerned.
Have you worn both?
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