I purchased an Airmini, and find it works well. I have no trouble with Resmed N20 nasal seal when used with my standard CPAP machine. However, when I use it with my Airmini, I find a redmark on my nose in the morning. Any tips on how to avoid this?

I feel more confident using my N30 thanks to both of you

Instructions for N30 mask says you should feel exhaled air coming from mask which indicates you will not be breathing expired air. The N30 came with a "Quiet Vent" and I don't feel much air coming from the vent. I'm concerned that I will be rebreathing expired air. Let me know if you have experience...