FIG. 1 is a front perspective view of the mask on a patient;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a back elevational view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a top elevational view thereof; and,

FIG. 6 is a bottom elevational view thereof.

The components depicted in broken lines are for illustrative purposes only and form no part of the claimed design. The left side elevational view is omitted as it is merely a mirror image of the right side elevational view.