Abstract: A respiratory mask includes a housing, an air supply tube, and a medium. The housing includes an inner surface, an air-passage opening, and a tubular wall that projects inwardly from the inner surface and that defines a receiving hole aligned and communicated with the air-passage opening. The air supply tube is connected fluidly to the air-passage opening. The medium is disposed in the receiving hole, and is made of a material that can absorb heat and moisture.