Yes, the 24L is the "acceptable" leak rate, as it the air coming out the exhaust port has to be accounted for. Anything over that says air is leaking elsewhere.
Full face masks are notorious for leaking. Try laying down during the day, mask and machine on, then moving around as you would assume you do at night. You can then figure out how to prevent it from happening at night.
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I just used the mask fit function where it skips the ramp up and get right down to business. After I figured out that the dial on the mask simply adjusts the tilt to match the slant of my face I was able to get the headgear set so it's comfy at full pressure, and it was reading a leak value of 0 on the screen. I rolled from side to side and even onto my stomach somewhat and there were no leaks.
I'll go rehash the cushion. I handle it with powder free nitrile exam gloves to keep fingerprints off when putting the clip back into the cushion.
Paula, the 24L leak rate needs to be associated with a pressure differential to have meaning. My max pressure of 20 cmH2O will leak more air through the exhaust ports than someone else with the same machine and mask but with a lower pressure. Also at a higher altitude a mask will leak more air than at sea level. If the machine just kicks in and calls anything over 24L/min a leak, I have no way of knowing if that number applies to my high pressure or was it set with a lower mask pressure as a standard.
That is why I wanted to know where the number comes from, whether stated in a manual or seen on a website so that I may tailor the info to my specific case.
unlike other machines ... S9 calculate unintentional leak (mask plus mouth leak)
You have to set the mask type (default is nasal)
unintentional leak = total leak minus intentional leak (leak from exhaust ports to flush exhaled air)
when you get Mr green smiley face means the 70th percentile leak is less than 24 L/min which is Good