Comparison
AirFit F20 or AirFit F40?
Two ResMed full face masks that cover the nose and mouth. The F20 is the classic full face mask, with a cushion resting on the bridge of the nose. The F40 is a compact full face mask that sits under the nose and leaves the bridge free, with a vent declared quieter.
Updated September 14, 2026
ResMed's classic full face mask
A full face mask covering the nose and mouth, offered in three cushion sizes and three headgear sizes. The headgear attaches with magnetic clips, and a non-magnetic version exists.
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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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Side by side
Data published by the manufacturers. Rows that differ come first.
| Specification | AirFit F20 | AirFit F40 |
|---|---|---|
| SizesDiffers | S, M, L | S large, M, L |
| Cushion materialDiffers | silicone (InfinitySeal) | silicone |
| Declared noiseDiffers | 23 dBA at 1 m · 30 dBA sound power | 13 dBA at 1 m · 20 dBA sound power |
| Nose bridgeDiffers | Covered by the mask | Free, the mask does not touch it |
| AirMini compatibleDiffers | Yes | No |
| Magnets | Yes | Yes |
| Top-of-head tube | No | No |
Which one for you?
Rather the AirFit F20 if:
- Mouth breathers
- People looking for a classic full face mask
Watch out for
- Magnets: contraindicated with some implants, see the warning
- Cushion rests on the bridge of the nose
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
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?
Your review is gold: tell us what changed between the AirFit F20 and the AirFit F40. It will help those who are hesitating today.
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