Abstract: Nasal interface systems and related components. An embodiment of the system employs a nasal interface comprised of a base portion and a soft pad portion. The base portion employs one or more side-entry fluid supply hoses and flow redirection structure which gently and quietly redirects the flow of incoming fluid to avoid the creation of noise. One or more fluid supply hoses are connected to the one or more inlets, preferably by releasable engagement structure. The nasal interfaces of the invention are sleek, unobtrusive, visibly attractive and avoid exposure of expelled gases toward partners of the wearer.

Abstract: A replaceable nasal interface system including a molded air tube having a generally D-shaped cross section, and including first and second lumens. The system further includes a base member operatively connected to and in fluid communication with the molded air tube; and a nasal interface operatively connected to the base member.

Abstract: A nasal interface including a hard base and a soft pad portion with angled butterfly wing portions. The soft pad portion is connected to the hard base portion, and in some arrangements, can be removed from the hard base portion. The soft pad portion includes a bellows positioned between a lower boarder and the butterfly wings.

Abstract: A replaceable nasal interface system including a molded air tube having a generally D-shaped cross section, and including first and second lumens. The system further includes a base member operatively connected to and in fluid communication with the molded air tube; and a nasal interface operatively connected to the base member. 11179020.

Abstract: An apparatus including a blower configured to provide a supply of breathing gas, and a delivery tube configured to deliver the supply of breathing gas to a user breathing interface. The delivery tube has an inside diameter of about 15 mm or less. The apparatus also including a control system configured to provide a control signal to the blower for controlling a pressure of the supply of breathing gas to between about 1 cm H2O to about 6 cm H2O at the user breathing interface. The control signal is based upon, at least in part, one of a pressure and a flow rate of the supply of breathing gas at the user breathing interface.