Air filter

Description

FIG. 1 is a front top perspective view of an air filter according to the new design;

FIG. 2 is a rear bottom perspective view thereof;

FIG. 3 is a front elevation view thereof;

FIG. 4 is a top plan view thereof; and,

FIG. 5 is a bottom plan view thereof.

The broken lines in the drawings show portions of the air filter that form no part of the claimed design.

Claims

The ornamental design for an air filter, as shown and described.