Different design, I started out with a air start nasal pillow, you rebreath a lot of air with this design. It sort of blows you up inside, with this one you get fresh air with every breath. Your exhale blows out the holes. Only thing I've noticed with my APAP is the pressure keeps increasing because of the venting holes. Not sure if that's ok? It is way more comfortable for me breathing fresh air with every breath.
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