Several embodiments of exhalation ports for use respiratory systems are described. Some of the embodiments provide an elongate body defining a lumen through which gases may flow. A plurality of tapered openings is arranged on a portion of the elongate body and configured to vent gases. A shroud extends from the elongate body and surrounds one or more of the plurality of tapered openings. The exhalation port is arranged to removably connect in-line with a circuit for delivering gases to a patient.
