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ResMed AirFit F40 Full Face CPAP Mask
ResMed AirFit F40 Full Face CPAP Mask
The ResMed AirFit F40 is ResMed's smallest full face CPAP mask. It uses an AdaptiSeal cushion — soft silicone with no hard parts — that sits under the nose rather than over the bridge, giving a full face seal in a noticeably smaller, lighter mask than the AirFit F20.
Why choose the AirFit F40
- AdaptiSeal cushion – all-silicone with no rigid parts, so it flexes as you move and change position.
- Under-the-nose design – nothing sits across the bridge of your nose, which is where most red marks come from. ResMed reports that over 70% of users experienced minimal to no facial marking.
- QuietAir vent – diffuses exhaled air to keep the mask whisper-quiet for you and anyone next to you.
- Magnetic headgear clips – guide themselves into place, so the mask goes on and off easily in the dark.
- Four-point adjustment – set it once and the headgear holds its position.
- Wide field of vision – read, watch television or wear glasses right up to lights out.
- Genuine ResMed product, supplied complete with headgear.
AirFit F40 vs AirFit F30i vs AirFit F20
All three are full face masks. The difference is where the cushion sits and where the tube connects.
| AirFit F40 | AirFit F30i | AirFit F20 | |
|---|---|---|---|
| Cushion position | Under the nose | Under the nose | Over the nose |
| Tube connection | Front of mask | Top of the head | Front of mask |
| Size | Smallest | Compact | Standard |
| Best for | Minimal contact, discreet fit | Active sleepers who move a lot | Higher pressures, widest fit range |
If you want the smallest possible full face mask, choose the F40. If tube drag is your main problem, the F30i routes the hose over your head instead.
Choosing your AirFit F40 size
The F40 is sized by cushion and headgear together. Please don't assume your size from another mask — the F40 sits differently from an over-the-nose mask.
- Small Wide cushion / Standard headgear
- Medium cushion / Standard headgear – the most commonly ordered combination
- Medium cushion / Small headgear – for smaller head sizes
- Large cushion / Standard headgear
If you are between sizes or unsure, contact us before ordering and we will talk it through.
What's in the box
- AirFit F40 mask frame
- AirFit F40 AdaptiSeal cushion (size as selected)
- Headgear with magnetic clips (size as selected)
- QuietAir vent ring and elbow
- User guide
Technical details
| Manufacturer | ResMed |
| Mask type | Full face, under the nose |
| Cushion | AdaptiSeal silicone |
| Vent | QuietAir |
| Cushion sizes | Small Wide, Medium, Large |
| Headgear sizes | Standard, Small |
| Contains magnets | Yes |
| Made from latex | No |
Important: this mask contains magnets
The AirFit F40 uses magnetic headgear clips. ResMed advises that masks with magnets are contraindicated for people with certain implants — including pacemakers, implantable defibrillators, neurostimulators, shunts, insulin pumps, aneurysm clips, stents, metallic ocular implants and metallic splinters in the eye — and for people in close physical contact with someone who has one.
If that applies to you, we stock non-magnetic alternatives. Please read the AirFit F40 user guide before use, and speak to your doctor if you are unsure.
Replacement parts
You do not need to replace the whole mask when one part wears out. We stock the AirFit F40 replacement cushion, AirFit F40 headgear and the QuietAir vent ring and elbow system separately. As a guide, cushions are usually replaced every one to three months and headgear every three to six months.
Frequently asked questions
Is the AirFit F40 a full face mask?
Yes. It seals around the mouth and under the nose, so it delivers therapy whether you breathe through your nose, your mouth or both. It is simply smaller than a traditional full face mask because it does not cover the bridge of the nose.
What is the difference between the AirFit F30 and the AirFit F40?
Both are compact under-the-nose full face masks. The F40 is the newer model and uses the AdaptiSeal all-silicone cushion with no hard parts, where the F30 uses a conventional cushion with a rigid frame section. The F40 is also smaller and lighter.
What mask setting should I use on my CPAP machine?
Select "Full Face" in your device's mask settings. If your machine offers a mask-fit or leak test, run it after fitting.
How do I clean the AirFit F40?
Wash the cushion daily in warm water with a mild liquid soap, and wash the headgear and frame weekly. Rinse thoroughly and allow to air dry out of direct sunlight. Do not use bleach, alcohol or scented cleaners.
Will the AirFit F40 work with my machine?
Yes — it uses a standard mask connection and works with ResMed, Philips, Löwenstein and other CPAP and bilevel devices.
The specific warranty period applicable to a product will normally be stated on the individual product page within the product description.
Where a specific warranty period is stated on the product page, that warranty period will apply to that product.
Where no specific warranty period is stated on the product page, the following general CPAPstudio warranty periods will apply:
| Product Category | General Warranty Period | Coverage |
|---|---|---|
| New CPAP, APAP & BiPAP Machines | 2 Years | Manufacturing defects and functional faults during normal intended use |
| Reconditioned / Like-New CPAP, APAP & BiPAP Machines | 6 Months | Functional and manufacturing faults during normal intended use |
| CPAP Masks – Complete Mask Systems | 3 Months | Manufacturing defects only |
| Mask Frames | 3 Months | Manufacturing defects only |
| Mask Cushions & Nasal Pillows | 3 Months | Manufacturing defects only; normal deterioration is excluded |
| Mask Headgear & Straps | 3 Months | Manufacturing defects only; normal stretching and wear are excluded |
| Standard & Heated CPAP Tubing | 3 Months | Manufacturing defects only |
| Humidifier Water Chambers / Tubs | 3 Months | Manufacturing defects only |
| Separate / Reusable Humidifier Units | 1 Year | Manufacturing and functional defects |
| CPAP Batteries & Battery Packs | 6 Months | Manufacturing defects and covered battery failure during normal use |
| Power Supplies & AC Adapters | 2 Years | Manufacturing and electrical defects during normal intended use |
| Data Modules & Electronic Accessories | 1 Year | Manufacturing and functional defects |
| Filters | 30 Days | Manufacturing or supply defects only |
| Other CPAP Accessories & Replacement Parts | 3 Months | Manufacturing defects unless otherwise stated |
Important
The warranty periods shown in the table above are our general warranty periods and apply only where a different warranty period has not been specified on the individual product page.
If the product page states a different warranty period — whether shorter or longer — the warranty stated on the product page will apply, subject to your statutory consumer rights.
For example, if a particular CPAP machine is advertised with a 3-year warranty, that 3-year warranty will apply instead of the general 2-year period shown above.
Similarly, certain accessories, batteries or specialist products may have different warranty periods. Where this is the case, the applicable warranty will be clearly stated on the relevant product page.
Please check the warranty information in the product description before purchasing. If no specific warranty is shown, the general warranty periods in the table above will apply.
All warranty cover is provided in addition to your statutory consumer rights and does not exclude, restrict or replace those rights.
