FIG. 1 is a front perspective view of an air purifier showing my new design according to a first embodiment;
FIG. 2 is a rear perspective view thereof;
FIG. 3 is a front elevational view thereof;
FIG. 4 is a rear elevational view thereof;
FIG. 5 is a left side elevational view thereof;
FIG. 6 is a right side elevational view thereof;
FIG. 7 is a top plan view thereof;
FIG. 8 is a bottom plan view thereof;
FIG. 9 is a front perspective view of an air purifier showing my new design according to a second embodiment;
FIG. 10 is a rear perspective view of FIG. 9;
FIG. 11 is a front elevational view of FIG. 9;
FIG. 12 is a rear elevational view of FIG. 9;
FIG. 13 is a left side elevational view of FIG. 9;
FIG. 14 is a right side elevational view of FIG. 9;
FIG. 15 is a top plan view of FIG. 9; and,
FIG. 16 is a bottom plan view of FIG. 9.
The broken lines in the drawings illustrate the portions of the air purifier which form no part of the claimed design.