The QuietAir elbow system includes a short tube and a quick-release elbow, designed to facilitate movement while wearing the AirFit F40 and simplify disconnection. The short tube and quick-release elbow minimize tube friction and leakage. The QuietAir™ vent generates only 20 dBA and gently disperses exhaled air for more peaceful therapy and quieter nights. Key Features: The QuietAir vent included in the elbow system is designed to significantly reduce noise to only 20 dBA and gently disperse exhaled air for quieter nights. The short tube and quick-release elbow are designed for ease of movement when wearing the AirFit F40. The short tube and quick-release elbow are designed for ease of movement when wearing the AirFit F40.