Resmed QuietAir Elbow for AirFit F20 / F30Resmed QuietAir Elbow comes as standard with ResMed AirFit F20, AirTouch F20, and AirFit F30 face masks. QuietAir uses smaller openings to release the same amount per breath as standard elbows but in a more gentle manner. QuietAir Features: AirFit F20 mask and AirTouch F20 mask are ResMeds quietest masks QuietAir is 9 times quieter compared to the previous model, with only 21 dBA. 75% gentler exhaled Air Flow In The Box 1x Resmed QuietAir