Abstract: A respiratory mask includes: a mask body for covering a part of a user's face; left and right wing portions, extending respectively from two opposite sides of the mask body and each having a rear surface adapted for attachment to the user's face; and an adhesive layer formed on the rear surfaces of the wing portions.

Abstract: A gas inspiratory and expiratory device for a respiratory mask includes a tubular housing having top and bottom ends, an air chamber formed between the bottom and top ends, a vent hole for fluid communication of the air chamber with ambient atmosphere, and a passage hole for fluid communication of the air chamber with a CO2 measuring apparatus. The top end is open to permit fluid communication of the air chamber with an internal portion of the respiratory mask. An inner tube is disposed within the air chamber, and includes an air inlet end disposed at the bottom end of the tubular housing, and an air supply end extending externally of the top end of the tubular housing.