FIG. 1 is a front perspective view of a frame for a respiratory mask according to our new ornamental 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 rear perspective view thereof; and,
FIG. 6 is a side view thereof.
The broken (dash-dash) lines showing environment or structure are for illustrative purposes only and form no part of the claimed design.
The dash-dot-dash lines indicate the boundary between claimed and unclaimed subject matter and form no part of the claimed design.