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Why does P30i/N30i have elbow vents?
#1
Why does P30i/N30i have elbow vents?
Why are there vents on the elbow at the top of my head? Why not more vents where they are needed, by my nose?  Odd.
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#2
RE: Why does P30i/N30i have elbow vents?
to cut noise and direct the vented air away from your partner.

the vents are needed to prevent rebreathing CO2
Fred Bonjour - Project Manager and Lead Tester for OSCAR - Open Source CPAP Analysis Reporter 
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