The ornamental design for the air vent assembly for an automobile, as shown and described.
FIG. 1 is a front left-side perspective view of the air vent assembly showing my new design, a vent connection piece is illustrated to the left of the air vent to illustrate the fact that the vent assembly of the figure is a right-side vent structure;
FIG. 2 is a front elevation view thereof;
FIG. 3 is right-side perspective view thereof, illustrating the vent assembly of FIGS. 1–2 with additional vents and connectors in a vent array;
FIG. 4 is a bottom plan view thereof, and indicating a connection piece; and,
FIG. 5 is a left-side elevation view thereof, also indicating a connection piece.
In the drawings, the broken lines shown in the Figures depict environmental subject matter only and form no part of the claimed design.