Trish.. has made the most important reply. Insure that the exhaust port is not closed off.
In fact , the mask designers have put a lot of research into the design of these mask. Perhaps, just perhaps, that any modification to the exhaust air flow at all will possibly cause a change (however slight perhaps) to the CO2 dissipation.
Yesterday is history; Tomorrow is a mystery; Today is a gift; Thats why its called "The Present".
I have always wanted to take a tiny tube and redirect the outflow. But the CO2 bit is too risky.
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Breathe deeply and count to zen.
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This topic has come up before and was the subject of some fairly heated discussion. This forum advocates taking control of your treatment, and basic mods like hose supports, etc. are great and I have used several tips from this forum to my benefit.
Where it may be an issue:
- Lowering vent flow as already noted above. You may not get the designed CO2 removal and this can be an issue.
- Changing anti-asphyxiation valves in any way! Don't, this will be a life threatening issue.
- Keep in mind the software packages (ResScan, Sleepyhead, Encore, etc.) may not know about any modification and this may cause incorrect reporting of leak rates and, in the worst case, could affect apnea detection.
Other than than, if the skirt is a little too big, take some sharp scissors and cut it back. Attach an alligator clip. Wrap portions in electrical tape if they have a sharp edge.
I would recommend you always have a spare handy before you try anything. Sometimes these things can just go wrong. Even a [/u]piece of tape can tear the thin silicon if you try to remove it.