The intentional leak rate is known as the vent rate; and it varies with pressure.
More pressure, more vent.
Some manufacturers publish a graph on their website.
And, your AHI is good, so a few CAs should not be a concern; you should always mention any concern to your doctor -- I'm thinking the doc will be OK with your therapy.
I found this in a PDF document on ResMed's website for the Quattro FX
INFORMATION ON APNEA BOARD FORUMS OR ON APNEABOARD.COM SHOULD NOT BE CONSIDERED AS MEDICAL ADVICE. ALWAYS SEEK THE ADVICE OF A PHYSICIAN BEFORE SEEKING TREATMENT FOR MEDICAL CONDITIONS, INCLUDING SLEEP APNEA. INFORMATION POSTED ON THE APNEA BOARD WEB SITE AND FORUMS ARE PERSONAL OPINION ONLY AND NOT NECESSARILY A STATEMENT OF FACT.
Your mask has to have a certain amount of leak or the CO2 you breath out would build up and cause problems. It would be sort of like strapping a plastic bag to your face. Not a good idea. Too much leaking is definitely bad, but none at all will kill you.
I imagine each mask's intentional leak will be around 24L/min simply because research will have shown that that's the amount necessary and I expect all mask manufacturers will follow that standard.
But I might be wrong.
The above is my opinion. It is just possible that I may, occasionally, be mistaken.
I am neither a Doctor, nor any other kind of medical professional.
Everything put together sooner or later falls apart.
Your brain is not the boss.
Our forefathers took drugs.
He's no fun he fell right over.
eseedhouse and justMongo. Thanks.
PR machine reports total leak.
The upper line. Threshold is about 70. Machine will flag large leak.
Your leaks are well under that and not bad for a SImplus at all. Simplus has a large vent rate anyway.
For the Simplus, and if you are a side sleeper, there is a good chance that you are mashing your face into the pillow and lifting up part of the mask seal. You can try sleeping with your ear on the edge of your pillow and handing the mask over the edge. If you are an active sleeper that won't have much effect.
For the AHI difference between masks, I get that too but can't explain it. Using the Eson nasal or Simplus FFM, I get different leak rates but similar AHI. If I try and use the P10 pillows, my AHI goes through the roof. I am still trying to figure that one out.
Well, yes, the graph is showing smallish leaks at some times. You might want to go into SleepyHead and turn on the display of CPAP events on the Leak Rate graph to see how the leaks match up with apnea events. (Hold your cursor over the Y-Axis values on the leaks graph and right-click and you'll see a menu come up.)
I'm never sure how correct the leak values are when they show up at the same time as an apnea event. Maybe someone else will have an answer for that.
Did you notice any leaks while you were sleeping or wake up with a dry mouth?
P.S. You probably already know, but those spikes in your pressure graph are the Respironics "Search" routine.