Mask carbon dioxide levels - toxicity

berkley6969 wrote:Wow, I feel the same way, I get out of breath a lot with my cpap, and that was
my thoughts exactly about my exhale not leaving the mask quick enough and that I was inhaling the
It right back. Can u tell me where you added the holes to your mask I believe this will fix
my problem as well thank you.

Very bad idea. Start a thread stating what problems you are having. If you feel "out of breath a lot with my cpap", then your system may not be set up for optimal treatment. Members here (except xxyzz) can help you.

Wow, 2013, i hope they correct this before 2020. I'm not going to wear my child's mask until they do. Jim

first time post. 2 months on resmed 10. first 4 hours of use i was a different person, wide awake. sleep disturbed 186 per hour on side. 18 per minute on back. i set my tube temp to 70 and within a couple of weeks i noticed it wasnt cool air any more changed to 68 but no difference. also was getting tired all day and falling asleep. i had a cough the other night and about blew the mask off my face. i then realized it wasnt venting. even with hose off of machine plugged end of hose and could not exhale. vents would close. took it to the office and showed them what it was doing. tech hooked it all up and it was working as it should. last night it was working good for a few minutes. cool air and all. then warm air. not venting again. turned light on and observed humid air going up the tube re breathing my own breath again. note Ive been taking mask off in my sleep then putting it back on and resetting machine. please take note you should not be getting that warm air while using machine. lucky to still be alive.

didwiggy wrote:first time post. 2 months on resmed 10. first 4 hours of use i was a different person, wide awake. sleep disturbed 186 per hour on side. 18 per minute on back. i set my tube temp to 70 and within a couple of weeks i noticed it wasnt cool air any more changed to 68 but no difference. also was getting tired all day and falling asleep. i had a cough the other night and about blew the mask off my face. i then realized it wasnt venting. even with hose off of machine plugged end of hose and could not exhale. vents would close. took it to the office and showed them what it was doing. tech hooked it all up and it was working as it should. last night it was working good for a few minutes. cool air and all. then warm air. not venting again. turned light on and observed humid air going up the tube re breathing my own breath again. note Ive been taking mask off in my sleep then putting it back on and resetting machine. please take note you should not be getting that warm air while using machine. lucky to still be alive.

Welcome to the forum and to CPAP! You've posted at the bottom of a thread that's several years old - you'll more likely get advice/help if you start a new thread. Also, it's helpful to those offering advice if you fill out your equipment profile (go to User Control Panel in the top left corner of the page).

My own comment would be that if your bedroom is cool at night, and you've set your tube temp at 70 (or 68), you're asking the machine to heat the air for you. Personally, I leave the heat turned off, as I prefer to breathe air the same temperature as the room.

miltf wrote:...I can certainly smell the silicone though so it must have some volatile content...

Did you soak it when you got it? I soak new mask parts for at least 60 mins in soapy water (I use Dawn). Then, spray with white vinegar and let sit for 3-5 mins, rinse very well, air dry. There should be NO smell.

didwiggy wrote:first time post. 2 months on resmed 10. first 4 hours of use i was a different person, wide awake. sleep disturbed 186 per hour on side. 18 per minute on back. i set my tube temp to 70 and within a couple of weeks i noticed it wasnt cool air any more changed to 68 but no difference. also was getting tired all day and falling asleep. i had a cough the other night and about blew the mask off my face. i then realized it wasnt venting. even with hose off of machine plugged end of hose and could not exhale. vents would close. took it to the office and showed them what it was doing. tech hooked it all up and it was working as it should. last night it was working good for a few minutes. cool air and all. then warm air. not venting again. turned light on and observed humid air going up the tube re breathing my own breath again. note Ive been taking mask off in my sleep then putting it back on and resetting machine. please take note you should not be getting that warm air while using machine. lucky to still be alive.

There is plenty of experienced help available here. Often, what seems like a major problem can be easily solved with help from members who went through the same thing. Please fill out your equipment profile (https://www.cpaptalk.com/ucp.php?i=prof ... pment_info) and copy and paste your post into a new thread.

kona0197 wrote: ↑

Fri May 09, 2014 1:30 pm

So what if you are right? I highly doubt you are. I don't hear of people dying from using the masks you list, nor do I hear of any lawsuits. You have yet to show me your results from testing at a pressure of 9 or 10. No one I know uses a pressure of 5. That would choke me.

Stuff it. I use a pressure of 5. You are another CPAP forum cheerleader and i'm tired of it. No open mindedness or critical thinking.

chris94546 wrote: ↑

Tue Feb 10, 2026 4:31 pm

Stuff it. I use a pressure of 5. You are another CPAP forum cheerleader and i'm tired of it. No open mindedness or critical thinking.

Well...you aren't the only one tired of someone.

I am so tired of people thinking their opinion is the only one that is right and getting all pissy about it when someone dares to say something they don't like or agree with yet here they are asking for thoughts.

Pugsy wrote: ↑

Tue Feb 10, 2026 4:42 pm

chris94546 wrote: ↑

Tue Feb 10, 2026 4:31 pm

Stuff it. I use a pressure of 5. You are another CPAP forum cheerleader and i'm tired of it. No open mindedness or critical thinking.

Well...you aren't the only one tired of someone.

I am so tired of people thinking their opinion is the only one that is right and getting all pissy about it when someone dares to say something they don't like or agree with yet here they are asking for thoughts.

Sorry should'nt have been so harsh (just a bit of frustration coming out). Just always get a feeling on these forums that too many are cheerleaders for the products, without some objective analysis of them. I honestly due feel the P10 has a serious ventilation problem, which I can observe for myself from practical use. When new, dry and clean you can feel a real stream of air venting from the mask. When moisture accumulates on the mesh, ventilation is greatly reduced to almost nothing. Doesn't take a rocket scientist to make this observation

I am not trying to shove my opinion down anyones throat (just my opinion). However, I ask that you carefully read the results of my Google AI inquiry on the subject. I realize there is no absolutly conclusive study that says, yes you with suffocate to death, but there is a lot of information that may suggest significant caution and vigilance should be used when using this mask. .......................

"Are there any clinical or scientific studies supporting this"

While there is no single published clinical trial specifically dedicated to the "aging" of the ResMed P10 vent mesh, there is significant scientific data from FDA adverse event reports, comparative rebreathing studies, and manufacturer-led research that supports the mechanism of this issue.
1. FDA MAUDE Database Reports
The most direct "clinical" evidence comes from the FDA’s MAUDE (Manufacturer and User Facility Device Experience) database. These are formal reports of medical device malfunctions:
Documented Obstruction: Reports state the P10 "recurrently becomes obstructed under rainout conditions".
Mechanism of Failure: Reports explicitly link the issue to "dust deposits within the interstices of the webbed vents" that, when combined with condensation, lead to "significantly elevated levels of inhaled CO2".
Reported Symptoms: Clinical symptoms reported to the FDA include abrupt onset of dyspnea (shortness of breath), nausea, and suffocating feelings.
U.S. Food and Drug Administration (.gov)
U.S. Food and Drug Administration (.gov)
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2. Comparative Rebreathing Studies
A 2024 study published in Sleep and Breathing (and indexed on PubMed) modeled CO2 rebreathing across several masks:
Performance Baseline: The study found that while the P10 has a "negligible" risk of rebreathing at normal respiratory rates (10 breaths/min or below) when functioning as designed, it—like all masks—is sensitive to "circuit-dependent CO2 rebreathing".
Exhalation Resistance: General research on CPAP systems confirms that when exhalation ports exhibit high resistance (as they would if clogged), it results in "considerable rebreathing" of exhaled gases.
National Institutes of Health (NIH) | (.gov)
National Institutes of Health (NIH) | (.gov)
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3. Manufacturer Research and Guidance
ResMed’s own technical data and white papers implicitly acknowledge the necessity of maintaining these specific vents:
Study Data: ResMed research shows the P10 is significantly quieter (21 dBA) than its predecessors due to the QuietAir woven-mesh venting.
Maintenance Mandate: Because of the fine nature of this mesh, ResMed’s official cleaning instructions specify using a soft bristle brush to clean the vent. This specialized instruction is a direct response to the mesh’s tendency to trap particles that larger, traditional vent holes would not.
Resmed
Resmed
+3
4. Independent Technical Observations
Independent users and forums have used microscopy to examine these vents:
Microscopic Evidence: Some users have posted photographic evidence on enthusiast boards showing that the mesh can be partially obstructed by "dust deposits" or mineral buildup from water, even when it appears clean to the naked eye.
Reddit
Reddit
If you'd like to investigate further, I can:
Help you find official cleaning videos for this specific mask.
Compare the venting design of the P10 vs. the newer AirFit P30i.
Provide a list of replacement schedules recommended by insurance vs. the manufacturer.