FIG. 1 is a front perspective view of a vent for a respiratory mask according to an embodiment of our design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a top view thereof;

FIG. 5 is a bottom view thereof;

FIG. 6 is a right side view thereof, with the left side view thereof being a mirror image thereof;

FIG. 7 is a rear perspective view thereof;

FIG. 8 is a front perspective view of a vent for a respiratory mask according to an embodiment of our design;

FIG. 9 is a front view thereof;

FIG. 10 is a rear view thereof;

FIG. 11 is a top view thereof;

FIG. 12 is a bottom view thereof;

FIG. 13 is a right side view thereof, with the left side view thereof being a mirror image thereof;

FIG. 14 is a rear perspective view thereof;

FIG. 15 is a front perspective view of a vent for a respiratory mask according to an embodiment of our design;

FIG. 16 is a front view thereof;

FIG. 17 is a rear view thereof;

FIG. 18 is a top view thereof;

FIG. 19 is a bottom view thereof;

FIG. 20 is a right side view thereof, with the left side view thereof being a mirror image thereof;

FIG. 21 is a rear perspective view thereof;

FIG. 22 is a front perspective view of a vent for a respiratory mask according to an embodiment of our design;

FIG. 23 is a front view thereof;

FIG. 24 is a rear view thereof;

FIG. 25 is a top view thereof;

FIG. 26 is a bottom view thereof;

FIG. 27 is a right side view thereof, with the left side view thereof being a mirror image thereof; and,

FIG. 28 is a rear perspective view thereof.

Where included, broken lines represent environmental structure and do not form a part of the claimed design.