FIG. 1 is a perspective view of an air purifier showing my new design;
FIG. 2 is another perspective view of the air purifier of FIG. 1;
FIG. 3 is a front elevational view of the air purifier of FIG. 1;
FIG. 4 is a rear elevational view of the air purifier of FIG. 1;
FIG. 5 is a left-side elevational view of the air purifier of FIG. 1;
FIG. 6 is a right-side elevational view of the air purifier of FIG. 1;
FIG. 7 is a top plan view of the air purifier of FIG. 1;
FIG. 8 is a bottom plan view of the air purifier of FIG. 1;
FIG. 9 is an enlarged detailed view of the air purifier in FIG. 1;
FIG. 10 is an enlarged detailed view of the air purifier in FIG. 6; and,
FIG. 11 is an enlarged detailed view of the air purifier in FIG. 7.
The broken lines are for environmental structure, boundaries, or illustrative purposes only and form no part of the claimed designs to be patented.