ResMed AirFit F20/F30 QuietAir Elbow.

Key Features

• QuietAir is a diffuser vent within the mask elbow. Featuring small multidirectional openings over a widespread area, QuietAir breaks up exhaled air so that it’s spread out lightly.
• While it releases the same amount of air per breath as our existing standard elbow, it’s much quieter and gentler.