I started using a Cpap machine in April. I must use a full face mask because I often have a stuffed nose due to allergies. If I sleep more than 6-7 hours a night I get back pain. Sometimes more severe than the other. My machine is set for 18/14. I recently stopped using the humidifier I didn't notic...

The flexfit HC431 is great. Very comfortable & comes with 3 differen sizes for the mask. One mask & 3 inserts. Much better that the respironics one.