EERS using Resmed AirFit P30i Mask

[GrantT]

So I have been getting pretty well nothing but CA's in my AHI reading these days, usually large clusters around 4:00am.  Anyways, one of the things mentioned as a possible resolution (thanks for all your help so far on this Sleeprider!) is the EERS option.

Perhaps this is just an incorrect and oversimplification, but from what I have read so far, EERS seems to be just moving a vent 6" (or another set distance) away to increase carbon dioxide reinhalation. Yes?

Now, when looking at my current mask (Resmed P30i) there is a vent right near the nasal area, and another vent on the back/top of the back.  Now, this might be where I type something stupid...but would blocking the nasal vent not be almost the same thing as the EERS modifications I have seen in the WIKI etc?  Or, perhaps blocking the nasal vent AND then slightly modifying (compensating) with the rear vent by just slightly increasing the little holes with a tiny drill bit to compensate for the loss of the front vent?

What I am missing?  Why would I not want to do this? i.e.  suffocating in my sleep?

They say there is no such thing as a stupid question, right?      I can't help to think this mask was almost IDEAL for EERS modification...

Grant

[Sleeprider]

I'm not sure what portion of the venting is accomplished at the mask and top of the headgear, so the safest approach would be to install the Respironics Whisper Swivel II vent available at Supplier #1, and block both mask vents. Alternatively, you could try blocking the nasal pillow vent and use the mask while awake for a half hour to make sure you get adequate venting. I don't think there will be a problem, but I don't know. Since it is a nasal pillows mask you don't need an emergency valve, just open your mouth. It's not a stupid question. If possible, start with an older mask you can discard if it doesn't work out.