How to Choose the Correct ResMed CPAP Mask Size
Choosing the correct ResMed CPAP mask size is essential for effective and comfortable sleep apnea therapy. A poorly fitting CPAP mask can cause air leaks, skin irritation, pressure marks, and reduced treatment effectiveness. This guide explains how to choose the right ResMed CPAP mask size to improve comfort, seal quality, and therapy success.
Why Proper ResMed CPAP Mask Sizing Is Important
The correct CPAP mask size directly affects:
Proper air seal and reduced leaks
Comfort during sleep
Skin protection and reduced pressure points
Consistent therapeutic pressure
A mask that is too small may cause discomfort and soreness, while a mask that is too large can leak air and compromise therapy results.
Types of ResMed CPAP Masks and Sizing
Before selecting a size, determine which type of ResMed CPAP mask you use:
Nasal CPAP Masks
Cover only the nose and are ideal for users who breathe through their nose.
Nasal Pillow Masks
Fit at the nostrils and provide minimal facial contact, making them popular for active sleepers.
Full Face CPAP Masks
Cover both the nose and mouth and are recommended for mouth breathers or higher CPAP pressure settings.
Each ResMed mask model has its own sizing guide, and sizes may vary between models.
How to Measure for a ResMed CPAP Mask Size
Use Official ResMed Mask Sizing Guides
ResMed provides model-specific printable sizing templates (PDF) for popular masks such as:
AirFit F20
AirFit N20
AirFit F30 / F30i
AirFit F40
Step-by-Step Measurement:
Print the ResMed sizing guide at 100% scale.
Place the template on your face following the instructions.
Identify the recommended size (Small, Medium, Large, etc.).
⚠️ Important: CPAP mask sizes are not universal. A Medium in one ResMed mask may not fit the same as a Medium in another model.
Tips for Proper CPAP Mask Fit
✔ The mask should seal — not squeeze
Over-tightening straps can cause leaks and discomfort. The cushion should gently rest against the face.
✔ Consider your facial structure
Nose shape, facial width, and distance from the bridge of the nose to the chin all influence the best mask size.
✔ Check fit while lying down
Always test your CPAP mask fit in your sleeping position, as facial contours change when lying flat.
✔ Headgear size is separate from mask size
Headgear affects stability and comfort, but the mask cushion size determines sealing performance.
Common CPAP Mask Sizing Mistakes
Choosing a mask size without measuring
Selecting a size based on appearance only
Tightening straps to stop leaks instead of resizing
Ignoring redness, soreness, or pressure marks
When to Get Help with CPAP Mask Sizing
If you continue to experience leaks or discomfort:
Review the ResMed sizing guide again
Try a different size or mask style
Consult a CPAP equipment specialist
Professional guidance can significantly improve CPAP therapy success.
Final Thoughts: Get the Best Fit for Better Sleep
Choosing the correct ResMed CPAP mask size is a key step toward comfortable and effective sleep apnea treatment. Using official sizing guides and proper fitting techniques helps reduce leaks, improve comfort, and support long-term therapy compliance.
Find the Right ResMed CPAP Mask for You
At Stark Medical Supplies, we offer a wide selection of authentic ResMed CPAP masks, cushions, and replacement headgear, along with expert support to help you choose the correct size.
👉 Shop ResMed CPAP Masks & Accessories
👉 Get Help Choosing the Right Size
👉 Fast Shipping & Trusted Support
Sleep better with a mask that truly fits.