The ornamental design for set of air vents for a jacket, as shown and described.
FIG. 1 is a front elevational view of the set of air vents for a jacket (the jacket shown in broken lines is shown for illustrative purposes only and forms no part of the claimed design);
FIG. 2 is an enlarged front elevational view of the right-side air vent removed from the jacket of FIG. 1, for ease of illustration;
FIG. 3 is an enlarged top plan view of the right-side air vent removed from the jacket of FIG. 1, for ease of illustration;
FIG. 4 is an enlarged side elevational view of the right-side air vent removed from the jacket of FIG. 1, for ease of illustration;
FIG. 5 is an enlarged opposite side elevational view of the right-side air vent removed from the jacket of FIG. 1, for ease of illustration; and,
FIG. 6 is an enlarged bottom plan view of the right-side air vent removed from the jacket of FIG. 1, for ease of illustration.