A respiratory interface device including a fluid coupling device having a main body and an exhalation plate having a plurality of vent holes, the exhalation plate being separate from and coupled to the main body. The present invention further relates to a fluid coupling device including an exhaust portion having a plurality of vent holes having a tapered shape. A set of the vent holes has an incident angle that radiates and originates from a common point. The present invention also relates to an exhalation mechanism including a plurality of vent holes defined by a continuous straight inner wall extending from an interior surface to an exterior surface wherein an exterior circumference of the vent hole is offset with respect to an interior circumference.