Glenn wrote:
I discovered the elbow vents on the mask ‘swivel elbow’ weren’t exhausting any air at all.
WOW, I didn't know that this forum reached beyond the grave.
Fact is, if the vents weren't exhausting any air at all,
YOU WOULD BE DEAD.That's what happens when you re-breathe your exhaled breath over and over... that's why plastic bags have warnings printed on them.