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 another front perspective view thereof;
FIG. 4 is a front elevational view thereof;
FIG. 5 is a rear elevational view thereof;
FIG. 6 is a left side elevational view thereof;
FIG. 7 is a right side elevational view thereof;
FIG. 8 is a top plan view thereof;
FIG. 9 is a bottom plan view thereof;
FIG. 10 is a front perspective view of an air purifier showing my new design according to a second embodiment;
FIG. 11 is a rear perspective view of FIG. 10;
FIG. 12 is a front elevational view of FIG. 10;
FIG. 13 is a rear elevational view of FIG. 10;
FIG. 14 is a left side elevational view of FIG. 10;
FIG. 15 is a right side elevational view of FIG. 10;
FIG. 16 is a top plan view of FIG. 10;
FIG. 17 is a bottom plan view of FIG. 10;
FIG. 18 is a front perspective view of an air purifier showing my new design according to a third embodiment;
FIG. 19 is a rear perspective view of FIG. 18;
FIG. 20 is a front elevational view of FIG. 18;
FIG. 21 is a rear elevational view of FIG. 18;
FIG. 22 is a left side elevational view of FIG. 18;
FIG. 23 is a right side elevational view of FIG. 18;
FIG. 24 is a top plan view of FIG. 18; and,
FIG. 25 is a bottom plan view of FIG. 18.
The broken lines in the drawings illustrate the portions of the air purifier which form no part of the claimed design.