The machine they tested me on had exhale relief as mine does not. However I still had their machine when the problem occurred on the last night I used it.
I have a remstar plus that does not have the c-flex feature.I am not sure what the machine was they had.

I am a new user of cpap therapy. I had no problem using the machine they provided to test my levels for 6 nights. The seventh night I had overfilled the humidifier. I woke up with a feeling of suffocation, I couldn't exhale, and removed my mask at the beginning of the night. I assumed it was because...