F6 Full Face Mask
The F6 uses an under-the-nose fit, a circular dispersion vent, crown-style headgear with clips, and a flexible short tube.
BMC Medical How-to Guide
How to Fit a Full Face CPAP Mask Step-by-Step
Fitting a full face CPAP mask correctly starts with choosing an appropriate interface and cushion size, then positioning it over the nose and mouth without overtightening the headgear. In this guide, I explain how to use the sizing points at the nasal bridge and chin indentation, create a stable seal, check the vent, and address common leaks or pressure points. It is intended for people using or evaluating BMC Medical full face masks, including the F5A+, F5+, and F6, as well as caregivers and healthcare professionals who need a clear fitting sequence. The fastest way to improve fit is to make small, even adjustments while lying in your usual sleeping position.
About the author
BMC Medical Editorial Team creates and reviews content on sleep-disordered breathing, chronic respiratory diseases, respiratory therapy, and related healthcare solutions. The team draws on BMC Medical’s experience in respiratory care to provide practical information for professionals, partners, patients, and caregivers worldwide.
What Is Fitting a Full Face CPAP Mask? (Quick Definition)
Fitting a full face CPAP mask means selecting the appropriate mask and cushion size, placing the cushion over the nose and mouth, and adjusting the headgear so the mask remains comfortable and sealed during prescribed therapy. Full face masks are designed for people who breathe through the mouth, experience nasal congestion, or need a full-face interface. A qualified healthcare professional or respiratory therapist should help determine whether this mask type is appropriate for your therapy.
Full Face CPAP Mask Options at a Glance
F5A+ Full Face Mask
The F5A+ has a forehead-free design and open field of vision. Its groove-fit cushion is designed to adapt to movement across therapy pressures.
F5+ Full Face Mask
The F5+ uses a forehead-support design for users who prefer that configuration. It also includes a groove-fit cushion, adjustable crown-style headgear, and quick-release components.
If you are comparing interfaces, review the full face CPAP mask options alongside your prescribed therapy needs and local product availability.
Quick Answer (Do This First)
- Choose a full face mask only when it is appropriate for your therapy and breathing pattern.
- Use the sizing gauge by aligning its bottom with the chin indentation and its top with the nasal bridge.
- Select the cushion size indicated by the sizing zone.
- Place the cushion over the nose and mouth, keeping it centered and free from folds.
- Adjust both sides of the headgear evenly and tighten only enough to create a stable seal.
- Scenario A: If air escapes, recenter the cushion and make small strap adjustments rather than overtightening.
- Scenario B: If the mask feels uncomfortable, check the nasal bridge, chin indentation, and cushion size before changing anything else.
- Keep the circular vent openings clear and follow the current user manual for cleaning and maintenance.
Prerequisites (What You Need)
- The prescribed full face CPAP mask and applicable cushion.
- The correct BMC Medical sizing gauge for the F5A+ or F5+ when applicable.
- Adjustable mask headgear and connected tubing.
- Your prescribed therapy settings.
- A clean, well-lit space for sizing and positioning.
- Mild liquid detergent, drinking-quality water, and a soft-bristled brush for cleaning.
- Guidance from a qualified healthcare professional when selecting or reassessing fit.
Step-by-Step: Fit a Full Face CPAP Mask
Step 1: Choose the correct mask type
A full face mask may be relevant if you breathe through your mouth, experience nasal congestion, or need an interface that covers both the nose and mouth. BMC Medical options include the forehead-free F5A+, the forehead-support F5+, and the under-the-nose F6. A healthcare professional or respiratory therapist can help determine whether this type of mask is suitable.
Success looks like: You are using a mask type that matches your therapy needs and preferred configuration.
Common mistake to avoid: Do not choose a mask solely by appearance or change your prescribed therapy approach without professional guidance.
Step 2: Measure for the correct cushion size
For the BMC Medical F5A+ and F5+ masks, align the bottom of the sizing gauge with the indentation beneath the chin. Align the top of the sizing window with the nasal bridge, then check the zone where the nasal bridge falls. Select the cushion size indicated by that zone. Multiple sizes are available for different facial structures.
Success looks like: The gauge is aligned at both reference points and identifies a cushion size without forcing the face into an unusual position.
Common mistake to avoid: Do not estimate size from the mask shell alone; use the applicable sizing gauge and current product instructions.
Step 3: Position the mask
Place the cushion over the nose and mouth, with the lower portion at the chin indentation and the upper portion at the nasal bridge. Keep the mask centered on your face and check that the cushion is not twisted or folded. The F5A+ provides an open field of vision without forehead support, while the F5+ uses forehead support.
Success looks like: The cushion follows the intended facial contact points and rests evenly without visible folds.
Common mistake to avoid: Do not pull the mask to one side to compensate for an incorrect cushion position.
Step 4: Adjust the headgear
Adjust the straps evenly on both sides, tightening only enough to create a stable seal. Recheck the mask after sitting or lying in your usual sleeping position because facial movement and sleep position can change the seal. The F5A+ and F5+ use adjustable, crown-style headgear and groove-fit cushions designed to adapt to movement.
Success looks like: The mask remains stable while the straps feel supportive rather than excessively tight.
Common mistake to avoid: Avoid overtightening, which may increase facial pressure or affect cushion performance.
Step 5: Check the seal using prescribed therapy
Before starting therapy, confirm that the cushion is centered and covers the nose and mouth as intended. Look for visible gaps around the cushion, then begin therapy using the prescribed settings. If air escapes, reposition the cushion and make small, even headgear adjustments. For additional CPAP mask leak troubleshooting, use the practical checks in the issue table below.
Success looks like: The mask stays positioned and the seal is stable without requiring excessive strap tension.
Common mistake to avoid: Do not change prescribed pressure or therapy settings to correct a mask-fit problem.
Step 6: Use the quick-release features
The F5A+ and F5+ include quick-release components, and the masks use a quick-release swivel or removable swivel depending on the model configuration. Use the quick-release mechanism when available to remove the mask without completely readjusting the headgear.
Success looks like: You can remove the mask using the applicable release feature while leaving the basic headgear adjustment intact.
Common mistake to avoid: Do not force a connector or release mechanism that does not match your mask configuration.
Step 7: Check ventilation
The 5+ Series uses a circular distributed dispersion vent designed to help reduce disturbance to the user and bed partner. Keep all vent openings clear, avoid covering the vent, and do not direct it toward bedding or another person. The brochure reports venting noise as low as 17 dB; actual performance depends on test conditions and configuration.
Success looks like: The vent remains unobstructed and free from residue or blockage.
Common mistake to avoid: Never cover the vent openings while wearing or storing the mask.
Step 8: Clean the mask correctly
For daily cleaning, soak mask components for 10 minutes in a mild liquid-detergent solution using drinking-quality water at 25–35°C. Gently clean crevices with a soft-bristled brush, rinse thoroughly with clean water, and air-dry away from direct sunlight. Hand-wash the headgear weekly for 10 minutes in a mild detergent solution, rinse it thoroughly, and air-dry it away from direct sunlight.
Success looks like: Components are clean, fully rinsed, dry, and ready for use without blocked vents or detergent residue.
Common mistake to avoid: Do not skip the current user manual’s instructions for cleaning, disinfection, replacement, or reprocessing.
Validation Checklist (Make Sure It Worked)
- ☐ The selected mask type is appropriate for the prescribed therapy.
- ☐ The cushion size was selected using the applicable sizing gauge.
- ☐ The upper cushion area aligns with the nasal bridge.
- ☐ The lower cushion area sits at the chin indentation.
- ☐ The cushion is centered and not twisted or folded.
- ☐ Headgear straps are adjusted evenly on both sides.
- ☐ The mask remains stable while sitting or lying in the usual sleeping position.
- ☐ No visible gaps remain around the cushion during prescribed therapy.
- ☐ Vent openings are clear and are not directed toward bedding or another person.
- ☐ The mask and headgear are clean, rinsed, and fully air-dried.
Common Issues & Fixes
| Problem | Cause | Fix |
|---|---|---|
| Air leaking around the cushion | The mask may be off-center, incorrectly sized, folded, twisted, or overtightened. | Recenter the mask, confirm the cushion size, smooth the cushion, and adjust both sides evenly. Contact a qualified healthcare professional if leakage persists. |
| Mask feels too tight | The headgear may be tighter than necessary or the cushion may be incorrectly positioned. | Loosen the headgear slightly while maintaining the seal, then recheck the nasal bridge, chin indentation, and cushion size. |
| Mask moves during sleep | The cushion size, centering, or strap balance may be unsuitable. | Recheck the size, center the mask, and adjust both sides evenly. Ask a qualified healthcare professional to reassess the fit if movement continues. |
| Discomfort at the nasal bridge or chin | The sizing points may not align, or the straps may apply excessive tension. | Reposition the mask, check the cushion size, and reduce unnecessary strap tension. Seek professional guidance if irritation continues. |
| Difficulty breathing through the nose | Nasal congestion or persistent breathing difficulty may be affecting comfort. | Discuss persistent congestion or breathing difficulty with a qualified healthcare professional before changing therapy or equipment. |
Best Practices (Do It Right Long-Term)
- Use the sizing gauge when applicable — accurate reference points are more reliable than guessing from the mask shell.
- Make small, even strap adjustments — minor changes can stabilize the seal without unnecessary facial pressure.
- Check the fit in your usual sleeping position — lying down can change how the cushion contacts the face.
- Keep the vent openings clear — unobstructed ventilation is part of correct mask use.
- Clean components on the recommended schedule — regular cleaning helps reduce residue and blockage.
- Follow the latest user manual — product configurations and reprocessing instructions may vary.
- Ask for professional reassessment when problems persist — recurring leaks or discomfort may indicate a sizing or therapy issue.
- Review CPAP mask cleaning guidance as part of your regular routine — consistent care supports reliable use.
Recommended Tool (Optional): BMC Medical
BMC Medical provides respiratory care products across sleep-disordered breathing, chronic respiratory diseases, and related respiratory health needs. Its full face mask information helps users understand the differences between forehead-free, forehead-support, and under-the-nose configurations.
- F5A+ and F5+ options use adjustable crown-style headgear and groove-fit cushions.
- The F6 provides an under-the-nose fit with a circular dispersion vent and flexible short tube.
- Multiple cushion sizes support different facial structures when available for the applicable model.
- Quick-release components can help with removal without completely readjusting the headgear.
When to use it / when not to: use BMC Medical product information to understand applicable mask features, but rely on a qualified healthcare professional for therapy selection, fit reassessment, and pressure decisions.
Explore Masks & AccessoriesIf you are still deciding on equipment, the CPAP machine selection guide can help you organize questions for a qualified healthcare professional. Users dealing with mouth breathing or nasal congestion may also want to discuss CPAP options for dry mouth and congestion.
FAQs
How should a full face CPAP mask fit? +
The cushion should cover the nose and mouth, with the upper portion aligned at the nasal bridge and the lower portion resting at the chin indentation. The mask should be centered, without folds or twists, and the headgear should be adjusted evenly. A stable seal should not require excessive strap tension.
How do I know which cushion size to use? +
For the BMC Medical F5A+ and F5+ masks, use the sizing gauge by aligning its bottom with the indentation beneath the chin and its top with the nasal bridge. The zone where the nasal bridge falls indicates the cushion size. A qualified healthcare professional can help if the result is unclear or the fit remains uncomfortable.
Should I tighten the mask if it leaks? +
Not automatically. First recenter the cushion, check the size, and make small adjustments on both sides of the headgear. Overtightening can increase facial pressure or affect cushion performance, so contact a qualified healthcare professional if leakage continues.
What is the difference between the F5A+ and F5+ full face masks? +
The F5A+ has a forehead-free design and open field of vision, while the F5+ uses forehead support. Both are described with groove-fit cushions, circular distributed dispersion vents, adjustable crown-style headgear, and quick-release components in the supplied product information.
How often should I clean a full face CPAP mask? +
The supplied guidance recommends daily cleaning for mask components and weekly hand-washing for the headgear. Use mild detergent, drinking-quality water at 25–35°C for the mask components, thorough rinsing, and air-drying away from direct sunlight. Always follow the latest user manual for complete cleaning, disinfection, replacement, and reprocessing instructions.
Important information
Product availability, configurations, accessories, connectivity options, and specifications may vary by country or region. Contact BMC Medical or an authorized local distributor for current information. This content is for general product and educational information only and is not a substitute for professional medical advice, diagnosis, or treatment. Therapy settings and product selection should be determined with a qualified healthcare professional. Specifications are subject to change without notice.
Conclusion
A reliable full face CPAP mask fit comes from the correct mask type, accurate cushion sizing, centered placement, even headgear adjustment, and a clear vent. Recheck the fit in your usual sleeping position, clean the components as directed, and ask a qualified healthcare professional about persistent leaks, discomfort, or breathing concerns. For product information and support resources, visit BMC Medical mask support.