The ornamental design for an airintake for helmet, as shown and described.
FIG. 1 is a front perspective view of an air intake for helmet showing our new design;
FIG. 2 is a rear perspective view thereof;
FIG. 3 is a front view thereof;
FIG. 4 is a rear view thereof;
FIG. 5 is a top plan view thereof;
FIG. 6 is a bottom plan view thereof;
FIG. 7 is an enlarged right side view thereof; and,
FIG. 8 is an enlarged cross-sectional view taken along line 8-8 in FIG. 3 thereof.
The broken lines illustrate portions of the air intake and form no part of the claimed design. The dash-dotted lines denote the boundary of the claim and form no part of the claimed design.