The ornamental design for a portion of a frontface of a headgear for a respiratorymask, as shown and described.
FIG. 1 is a portion of a front face of a headgear for a respiratory mask according to our design.
The thickness of the headgear forms no part of the claimed design.
The broken lines in FIG. 1 show environment or structure of the headgear which are for illustrative purposes only and form no part of the claimed design.