ResMed AirFit F40 Full Face Mask

ResMed's smallest tube-down full face CPAP mask. The AirFit F40's AdaptiSeal silicone cushion sits under the nose with minimal contact and a secure seal. Simplified 4-point fitting and three cushion sizes for a 98% fit range.

The ResMed AirFit F40 is ResMed's smallest tube-down full face CPAP mask — an under-the-nose design that delivers the coverage and seal performance of a traditional full face mask in a significantly more compact and less intrusive package. Where the AirFit F20 uses a larger silicone cushion and the AirFit F30i routes the tube to the top of your head, the F40 keeps the familiar front-entry connection but strips back the cushion footprint and simplifies the fitting process, making it a strong option for both first-time full face mask wearers and experienced users looking to downsize.

Key Features

• AdaptiSeal™ total silicone cushion — a low-profile, fully silicone cushion that actively adapts to the contours of your face to maintain a consistent seal even as you shift positions during sleep; sits under the nose with minimal facial contact to reduce marks and pressure
• Fully flexible universal frame — the single frame size fits all three cushion sizes, flexes naturally with facial movement, and sits lower on the cheek than traditional full face masks, giving more clearance below the eyes and above the ears for a less obstructed feel
• Short flexible tube — a short tube replaces the standard full-length CPAP hose connection at the mask face, reducing drag and giving more freedom of movement compared to conventional front-entry masks; connects directly to your standard CPAP tubing
• Simplified headgear — just four adjustment points — two upper and two lower strap adjustments make fitting faster and more intuitive than most full face masks; 100% of patients in a ResMed clinical study found the F40 easy to use
• Magnetic clips — snap the lower headgear straps to the frame quickly and securely each night; no threading, no guesswork in the dark
• QuietAir™ diffused venting — the vent ring integrated into the cushion assembly disperses exhaled air quietly for a more peaceful sleep environment for both you and your bed partner
• 98% fit range — three cushion sizes (Small-Wide, Medium, Large) and three headgear sizes (Small, Standard, Large) cover a broad range of facial profiles; 96% of patients in a ResMed AU clinical study reported the F40 was comfortable at first fit
• Clear field of vision — the low-profile design keeps your line of sight open for reading, watching TV, or wearing glasses before sleep

Who Is This For?

The AirFit F40 suits mouth breathers and sleep apnoea patients who need full face coverage but want a lighter, lower-profile mask than the AirFit F20 — without switching to a tube-up design. It's particularly well suited to people who are new to CPAP therapy and find larger full face masks daunting, as the simplified four-point headgear and adaptive cushion make first fits significantly less frustrating. If you'd prefer the tube routed to the top of your head for even greater freedom of movement, the ResMed AirFit F30i is worth comparing. If your therapy pressure is on the higher end and you prefer a larger, more established cushion with a proven track record at elevated pressures, the ResMed AirFit F20 remains a strong alternative.

What's in the Box

• AirFit F40 universal frame
• AdaptiSeal silicone cushion (in selected size)
• Standard headgear with magnetic clips
• QuietAir vent ring
• QuietAir elbow and short tube
• User guide

Small and Large headgear sizes are available separately if needed. When your cushion needs replacing, genuine AirFit F40 replacement cushions are available in Small-Wide, Medium, and Large.