ResMed's HumidAire 3i is engineered to deliver heated humidification and create a complete integration of the unit when connected to a ResMed S8 series CPAP machine. The HumidAire 3i is constructed to give relief from symptoms such as dry nose or mouth, irritation, and congestion sometimes related to CPAP therapy without jeopardizing performance or convenience. Up to 40% of nasal CPAP users experience nasal congestion and dryness of the nose and throat. The warm moist air that humidification provides has been proven to relieve symptoms of dryness and can make therapy more comfortable.