Thanks for the feedback. Seems the noise is normal and lack of exhaust normal so will persevere. I use the N20 mask with my S9 and it works just fine.

I have had a Resmed AirMini for a couple of years and still can't use it. I use an N20 mask. There are 2 problems....it makes a noise when I breathe in which is not an issue with my S9 and I cannot feel any exhaust from the exhaust outlet in the mask. The noise makes it hard to go to sleep and the l...