FIG. 1 shows a perspective view of the air purifier showing our new design;
FIG. 2 shows a left side elevational view thereof;
FIG. 3 shows a right side elevational view thereof;
FIG. 4 shows a front elevational view thereof;
FIG. 5 shows a rear elevational view thereof;
FIG. 6. shows a top plan view thereof; and,
FIG. 7 shows a bottom plan view thereof.
The broken lines illustrate portions of the air purifier and form no part of the claimed design.