A deflector mechanism (20) for use with a respiratory interface device (8) is provided. The interface device includes a cushion (8a), a mask frame (8b) supporting the cushion, a patient circuit (6) coupled to the mask frame adapted to carry a flow of gas, and an exhaust port (10) integrated in the frame and/or the patient circuit for venting exhaust gases (12) from the respiratory interface device. The deflector mechanism includes a deflector portion (24) having a surface (25) and a mounting portion (22) that couples the a deflector to the frame and/or patient circuit such that vented exhaust gases contact the surface of the deflector portion. The deflector portion is structured to modify sound created by the venting exhaust gases. The deflector portion is also structured to selectively direct the exhaust gases without an addition additional restriction, i.e., a greater pressure drop, to the flow of the exhaust gases.
