ResMed AirFit F40 – Full Face CPAP Mask

The F40 is more compact and more discreet than the F20. Its AdaptiSeal cushion sits under the nose, whereas the F20 InfinitySeal cushion covers the nasal bridge. The F40 also has a fully soft frame with no rigid parts, while the F20 has a more structured frame. For users wanting a modern, minimalist full face mask, the F40 is the current ResMed pick.

The AirFit F40 comes in Small, Medium and Large. Mask size matches cushion size. Download the official ResMed sizing template, print at 100 percent and place under the nose. Size M fits most adults. The cushion should not extend past the base of the lower lip.

Yes, this is one of its strengths. The under-the-nose cushion frees the field of vision, the frame is ultra-light and there is no forehead support. The bulky feeling is minimal. If a classic full face mask felt suffocating, the F40 offers a gentler transition. Its rigid-part-free cushion also reduces the sensation of pressure on the face.

Yes. The flexible frame and compact design limit pillow interference. The AdaptiSeal cushion absorbs lateral pressure without deforming. If you sleep strictly on your side or stomach, the F30i with top-of-head connection remains more flexible. For mixed sleepers, the F40 is a great balance of comfort and ease.

The F40 connects to any CPAP or BiPAP with a standard 22 mm fitting. This includes ResMed AirSense 10 and 11, Philips DreamStation, Fisher and Paykel SleepStyle and Loewenstein Prisma. For AirMini use, buy the dedicated F40 setup pack, sold separately by ResMed.

QuietAir is an exhaled-air diffusion system that spreads the flow over a larger area. The QuietAir elbow reduces perceived noise by around 89 percent according to ResMed and softens the airstream toward your partner. For shared sleep, it is real comfort. If you sleep alone, the standard version also performs well.