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Long term nasal user, basic issue when trying full-face
Long term nasal user, basic issue when trying full-face
Hi, sorry for such a basic question tried the search feature but this does not seem to be a thing, which makes me think I am doing something fundamentally wrong.

Been benefiting from CPAP for over 5 years, nose breather and always used nasal but lately finding myself doing weird mouth things, particularly since I prefer sleeping on my back.  

Figured I would try a full face mask and bought an AirFit F30i since I've been loving the AirFit N30i since it came out.  

As hoped the fit works fantastic for me and the mask feels comfortable, slept for a few hours and then had to go back to nasal -  every time my mouth would crack open the air would make my mouth / cheeks would blow like a blowfish.  Tried breathing through my mouth no difference.  I can't imagine this is normal.

My CPAP is a Dreamstation and I've had the Mask Type setting to OFF for years since I learned here that it does not apply to ResMed masks.   So I made NO settings changes at all between the F30i and the N30i.    Is this the problem?

Other than that I noticed that the auto-start feature would not work with the full-face, so I had to push the button to start the air-flow - does this indicate a problem?

Thanks in advance!
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RE: Long term nasal user, basic issue when trying full-face
Regarding the auto-start:
I have found that I don't have a strong enough exhale/inhale to trigger the auto-start with a FFM.

Regarding the sudden mouth weirdness:
I experienced the same thing after some time using P10s. I thought my body had unlearned how to nose-breathe. After much experimentation and observation, I've learned it wasn't me it was the mask! For me, the P10 either wasn't or it began not venting well, so I was rebreathing my exhaled air, which my body was rejecting and thus side-stepping by opening my mouth to breathe clean air.

I am now experimenting with modifying the vent on my P10, to help it vent better. I'm hopeful this will work for me. (Obviously this wouldn't be recommended as medical advice. I'm just sharing my experience.)
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RE: Long term nasal user, basic issue when trying full-face
Thanks, that's an interesting observation, wonder if that may be the case for me too.

I think that if I can figure out the full face that could still make things good again, and my wife also commented on how quiet my exhale was during the few hours that I wore it.

Eager to hear ideas on tackling the "blowfish" issue.
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