Since last week I have a Philips DreamStation which I got via the hospital. I use it with a nose cap. The first night I had to stay in hospital and I clearly felt a continuous airflow through my nose. There was also some air which flew away via the top front. According the nurse this was normal as it was "over pressured air".
The second night I felt the same continuous airflow through my nose. But after then, I had two nights in which I did not feel anything and all air seemed directly to flow away through the over-pressure exits. I tried to tighten/straighten the mask, put it higher/lower in my face, ... without result except the air also flew away via other sides of the cap meaning it is not put on straightened enough. The following night was the same as during the first two nights. During last night, I felt nothing and all of the air once again seems to flow directly away through the over-pressure exits.
So I called to customer support and they said it is normal and - in my case - my nose already got used of the airflow and I don't feel it anymore. According them, if no air escapes via other parts than the over-pressure exits all is fine. I do not agree with this answer as regarding the situation, I feel the air through my nose as soon I put on the machine, or I don't feel anything at all at least during the time I'm still awake. Even if I breathe I do not feel the pressured air. If a open my mouth there is a huge flow going through my nose and even exits via my mouth due to the pressure.
So I called my hospital but they were not willing to help as all kind of support and technical issues are outsourced to the customer support of the supplier.
So my question: should I always feel a continuous airflow through my nose or not? If yes, what could I do wrong? I put my mask on in the correct way so I have no idea what's the root cause of this issue.