NO . Auto-setting . They run at a minimal setting like an auto on idle , increase the pressure only when needed and return to the low/base setting when there is no obstruction . I cannot tolerate a fixed pressure machine . I currently am using an Auto-setting DeVilbiss IntelliPAP CPAP with heater/humidifier . Your doctor may not know the difference , many don't . When I was at the sleep study , they hooked me up with fixed pressure and I could not exhale . I told them " no way " . They kept the pressure low until I fell asleep and turned it up after entering sleep . When I awoke , I felt blown up like a balloon and worse than I ever had when awaking . All this after I was promised the best night of sleep that I had ever experienced . The one thing that you should never feel is the sensation of suffocating unless you are trying to relate being unable to exhale easily . With an Auto-setting CPAP , that is over forever . Your insurance carrier may only want to authorize an Auto-setting CPAP for diagnosis . That is pure crap . I have no insurance and was able to navigate myself through all of the crap . Keep in mind that most of the people that you are sealing with have been trained to do certain things and have very limited understanding of how to think outside of the box . I ran up against this hard . The people that provided my first CPAP refused to provide an Auto-setting CPAP to me because of the insurance diagnosis code thing until I explained to them that none of it applies to me and that I am telling them what I want . I never turned back and hold nothing against them because they are simply following their training and keeping their jobs . If your provider will not provide you with an Auto-setting CPAP , you can purchase one on the internet as long as you can provide them with a copy of your prescription . If they refuse to give you a copy of your prescription as mine did , go to your doctor and your doctor will write you a new prescription . My doctor did this for free to my pleasant surprise when I walked in to set up an appointment . My current CPAP cost me $465.00 . One reason that providers don't want you to purchase your machine is that if they provide it , they will be receiving rent for the machine until you die or stop using them . In other words , it never actually is paid for and provides them with a permanent income stream . It is to their advantage to keep you on the hook . Over time , that machine will be paid for hundreds of times over the original cost to them .