ResMed AirFit F20 Mode D'emploi page 11

Adjustment (AirFit F20)
If necessary, slightly adjust the position of the mask for the most
comfortable fit. Ensure that the cushion is not creased and the headgear
is not twisted.
1. Turn on your device so that it is blowing air.
Adjustment tips:

With air pressure applied, pull the mask away from your face to
allow the cushion to inflate and reposition onto your face.

To resolve any leaks at the upper part of the mask, adjust the
upper headgear straps. For the lower part, adjust the lower
headgear straps.

Adjust only enough for a comfortable seal. Do not overtighten as
this may cause discomfort.
Adjustment (AirTouch F20)
If necessary, slightly adjust the position of the mask for the most
comfortable fit. Ensure that the headgear is not twisted.
1. Turn on your device so that it is blowing air.
Adjustment tips:

To resolve any leaks at the upper part of the mask, adjust the
upper headgear straps. For the lower part, adjust the lower
headgear straps.

Adjust enough for a comfortable seal.
Removal
1. Twist and pull both magnetic clips away from the frame.
2. Pull the mask away from your face and back over your head.
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