FIG. 1 is a front perspective view of a frame for a mask assembly according to a first embodiment of our design;

FIG. 2 is a front view of a frame for a mask assembly according to a second embodiment of our deign;

FIG. 3 is a rear view thereof;

FIG. 4 is a front perspective view thereof;

FIG. 5 is a rear perspective view thereof;

FIG. 6 is a bottom view thereof;

FIG. 7 is a top view thereof;

FIG. 8 is a is a right side view thereof; and,

FIG. 9 is a left side view thereof.