Answer: I have Sleep Apnea, but I depend on my Dr., who also has Sleep Apnea, to suggest what masks to use. We just got done fitting me for a new mask and after 9 years I am finally getting a new machine, with warm air mist. Here is the web link the national sleep apnea organization. They have a forum that can possibly answer any specific questions you may have.http://www.sleepapnea.org/And here is the google search.http://www.google.com/search?sourceid=na...