Seal (or good seal)

Your mask needs to seal well on your face for you to get the full benefit of therapy. A good seal means that the air pressure being delivered to you is distributed evenly and comfortably and is not leaking out from your mask. You will know it's a good seal because your mask will feel firm but not tight on your face and around the headgear. If you hear or feel any air escaping from your mask (i.e. 'leaking') your mask may not be sealing well and you should adjust it. Check also that you have the right mask type for your face, the right mask size, and that you are fitting your mask correctly using the fitting guide.